CN101110965B - Apparatus and method for adjusting color value - Google Patents

Abstract

The invention relates to a color value adjusting device and a method, wherein the device comprises a weight value generating unit, a color deviation value generating unit and a color adjusting unit. The method comprises the following steps: receiving a first RGB color value containing a plurality of color components in image data and carrying out a first operation on the first RGB color value; receiving the first RGB color value and the weight value and carrying out second operation on the first RGB color value and the weight value to generate a color deviation value; the first RGB color value and the color offset value are received and subjected to a third operation to generate a second RGB color value. The first operation includes subtracting the minimum value from the maximum value of the plurality of color components to generate a saturation value, and generating a weight value by calculation through a weight function determined by the saturation threshold, the weight threshold, and the slope. The second operation comprises generating a gray value by using the first RGB color value and generating a color shift conversion value according to the gray value and the weight value. The invention can avoid the problem of over complexity in the process of adjusting the image color.

Description

Apparatus and method for adjusting color value

technical field

The invention relates to a color value adjustment device and a color value adjustment method applied thereto, in particular to a color value adjustment device and an adjustment method for adjusting an image display device.

Background technique

On image display devices such as general TVs or monitors, improving the picture quality of displayed images is an important issue in the development of image display technologies. With the development of technology, image display devices have basically made significant progress in the quality of image display from early image tube displays to today's liquid crystal displays; however, since the output of image display devices is converted by image signals Therefore, even if the input is the same image signal, for image display devices of different brands, or for image display devices of the same brand but with different hardware conditions and performance capabilities, the displayed image quality will be different. Variations in output results may occur due to changes in the transmission or conversion process or other factors, resulting in a so-called color shift. Furthermore, due to the differences in the visual senses of the human eye, there are inherently different acceptance levels for the displayed image quality. For example, Asians and Europeans have different perceptions of warm colors and cool colors due to the different colors of pupils and irises. Situations with different degrees of preference.

Therefore, general image display devices usually have a color correction function, so that the image display of the image display device can be adjusted to the display result preferred by the user according to the needs of the user. Furthermore, color adjustment is related to the output selection of the color temperature of the image display device. The color temperature is in absolute temperature (Kelvin). Different color temperatures can define different colors on the frequency spectrum. When the color temperature is low ( For example, about 2000K to 3000K red), its output is bright warm color, and when the color temperature is high (such as about 8000K to 10000K blue), its output is softer cool color. However, general image display devices are usually adjusted according to customer requirements before leaving the factory, or only use the standard color temperature (about 5000K) as the original setting.

The user can also use related programs (such as the color management or color correction function of the display setting program in the computer) to adjust the image display device used to output and display the above-mentioned image screen. The functions can include: brightness (Brightness), contrast (Contrast), sharpness (Sharpness), gamma value (Gama), color value (Color), etc., when the user wants to perform the desired display effect on the image signal output to the image display device When adjusting, you can manually correct and adjust the parameters of the above functions one by one to obtain the display quality of the image you want to see.

The user can increase or decrease the value represented by controlling the adjustment bar cursor of brightness, contrast, sharpness, gamma value, etc., and can directly check the effect of the adjustment on the screen, for example: changing the brightness of the image degree, increase or decrease the color contrast between different colors, etc., or use the gamma value curve adjustment, and can use higher and lower gamma values on darker and brighter pictures according to the perception of human eyes. Ma value, to obtain more color performance about the dark part of the image and the bright part of the image respectively.

The above-mentioned adjustment method is aimed at the color value in the input image signal, that is, based on the three primary colors of red (Red, R), green (Green, G) and blue (Blue, B) in the color space (color space). The value represented is calculated and converted by specific function parameters or functions, so more advanced, users can also directly fine-tune the gain (gain) or offset (offset) of the RGB three primary colors one by one to achieve Adjust the image display effect acceptable to the user.

However, it is not easy to obtain the desired image display quality through the above-mentioned adjustment method when only white adjustment is required, or after adjusting a certain functional parameter or one of the three primary colors of RGB, the next functional parameter Or the adjustment of the three primary colors of RGB may change the result of the previous adjustment, and all adjustment processes will cause different changes in the corresponding degrees of other colors. The present invention proposes a new color adjustment device and method for this deficiency.

Contents of the invention

The object of the present invention is to provide a color value adjustment device and a color value adjustment method, so that white correction can be effectively performed on a common image display device.

The present invention is a color value adjustment device, which is applied to the color adjustment of image data. The color value adjustment device includes: a weight value generation unit, which receives the first RGB color value in the image data, and calculates the first RGB color value for the first The RGB color value performs a first operation to generate a weight value, and the first RGB color value includes a plurality of color components; a color offset value generation unit receives the first RGB color value and the weight value, and converts the performing a second operation on the first RGB color value and the weight value to generate a color offset value; and a color adjustment unit that receives the first RGB color value and the color offset value, and combines the first RGB color value with the color offset value The color offset value is subjected to a third operation to generate a second RGB color value; wherein the first operation includes subtracting the minimum value of the plurality of color components from the maximum value of the plurality of color components to generate a saturation value , and through the weight function calculation, the weight value is generated, and the weight function calculation is determined by the saturation threshold, the weight threshold, and the slope; the second operation includes using the first RGB color value to generate a gray value, and the The grayscale value is compared with the color comparison table to generate a color shift conversion value, and the color shift value is generated according to the weight value and the color shift conversion value; the third operation is to generate the color shift value by the color adjustment unit The first RGB color value is added to the color offset value to generate the second RGB color value.

According to the color value adjustment device of the present invention, wherein the weight value generation unit includes: a saturation value generation unit, which receives the first RGB color value, and generates the saturation value; and a weight value calculator, which receives the saturation value , and through the calculation of the weight function, the weight value is generated.

According to the color value adjusting device of the present invention, wherein the saturation value generating unit includes: a maximum value generator, which generates the maximum value of the plurality of color components; a minimum value generator, which generates the plurality of color components and a saturation value calculator that generates the saturation value based on the maximum value and the minimum value.

According to the color value adjusting device of the present invention, wherein the color shift value generating unit includes: a gray value generator, which receives the first RGB color value, and generates a gray value; a gray color conversion unit, which receives The gray value generates a color shift conversion value according to the gray value and the color comparison table; and a color shift value calculator receives the weight value and the color shift conversion value and generates the color shift value transfer value.

According to the color value adjustment device of the present invention, the grayscale color conversion unit includes: a grayscale color conversion generator, which receives the grayscale value, and generates the first color component according to the grayscale value and the color comparison table A plurality of grayscale color mapping values and a plurality of grayscale color mapping values of the second color component; a first color component offset conversion value calculator, which receives the plurality of grayscale color mapping values of the first color component and the second color component A plurality of grayscale color mapping values of two color components, according to the association between the grayscale value and the plurality of grayscale color mapping values of the first color component, and the association between the grayscale value and the plurality of grayscales of the second color component an association of color mapping values to generate a first color component offset conversion value and a second color component offset conversion value; and a second color component offset conversion value calculator that receives the first color component offset conversion value and the first color component offset conversion value The second color component is shifted by the converted value, and a third color component is shifted by the converted value, and further the color shifted converted value is generated.

According to the color value adjusting device of the present invention, wherein the second operation is to linearly combine a plurality of color components contained in the first RGB color value by the gray value generator to generate the gray value, and the gray value is generated by the The grayscale color conversion generator compares the grayscale value with the color comparison table to generate the plurality of grayscale color mapping values, and then the first color component offset conversion value calculator according to the grayscale value interpolating the linear combination with the association of the plurality of grayscale color mapping values to generate the first color component offset conversion value and the second color component offset conversion value, and offset by the second color component The conversion value calculator linearly combines the first color component offset conversion value and the second color component offset conversion value to generate the third color component offset conversion value, and then becomes the color offset conversion value, and The color shift value is then generated by multiplying the weight value by the color shift conversion value by the color shift value calculator.

According to the color value adjusting device of the present invention, wherein the color shift value generating unit includes: a gray value generator, which receives the first RGB color value, and generates a gray value; a gray color conversion unit, which receives The gray value generates a color shift conversion value according to the gray value and the color comparison table; and a color shift value calculator receives the weight value and the color shift conversion value and generates the color shift value transfer value.

According to the color value adjustment device of the present invention, the grayscale color conversion unit includes: a grayscale color conversion generator, which receives the grayscale value, and generates the first color component according to the grayscale value and the color comparison table a plurality of grayscale color mapping values and a plurality of grayscale color mapping values of the second color component; a first color component offset conversion value calculator, which receives associations of the plurality of grayscale color mapping values of the first color component, and the grayscale value and the multiple grayscale color mapping values of the second color component, according to the grayscale value, the multiple grayscale color mapping values of the first color component and the multiple grayscales of the second color component an association of color mapping values to generate a first color component offset conversion value and a second color component offset conversion value; and a second color component offset conversion value calculator that receives the first color component offset conversion value and the first color component offset conversion value The second color component is shifted by the converted value, and a third color component is shifted by the converted value, and further the color shifted converted value is generated.

Another aspect of the present invention is a color value adjustment device, which is applied to image data. The color value adjustment device includes: a weight value generation unit, which receives the first RGB color value in the image data, and The RGB color value performs the first calculation to generate a weight value, and the first RGB color value includes a plurality of color components; the color offset value generating unit includes: a gray value generator, which receives the first RGB color value, and generate a gray value; a gray color conversion unit, which receives the gray value, generates a color shift conversion value according to the gray value and a color comparison table; and a color shift value calculator, which receives The weight value and the color offset conversion value, and generate the color offset value; and a color adjustment unit, which receives the first RGB color value and the color offset value, and converts the first RGB color value and the color offset value performing a third operation on the color offset value to generate a second RGB color value; wherein the first operation includes subtracting the minimum value of the plurality of color components from the maximum value of the plurality of color components to generate a saturation value, The weight value is generated through the weight function calculation, and the weight function calculation is determined by the saturation threshold, the weight threshold, and the slope; the third operation is to offset the first RGB color value and the color by the color adjustment unit Values are added to produce the second RGB color value.

According to the color value adjustment device of the present invention, wherein the third operation is to add the first RGB color value and the color offset value to generate the second RGB color value by the color adjustment unit.

Another aspect of the present invention is a color value adjustment device, which is applied to image data. The color value adjustment device includes: a gray value generator, which receives the first RGB color value in the image data, and generates gray degree value; a grayscale color conversion unit, which receives the grayscale value, and generates a color shift conversion value; a color shift value calculator, which receives the color shift conversion value and a weight value, and generates a color shift value a shift value; and a color adjustment unit, which receives the first RGB color value and the color shift value, and performs an operation on the first RGB color value and the color shift value to generate a second RGB color value; wherein the The weight value is generated according to the first RGB color value.

According to the color value adjustment device of the present invention, the grayscale color conversion unit includes: a grayscale color conversion generator, which receives the grayscale value, and generates multiples of the first color component according to the grayscale value and the color comparison table a grayscale color mapping value and a plurality of grayscale color mapping values of the second color component; a first color component offset conversion value calculator, which receives a plurality of grayscale color mapping values of the first color component and the second color component A plurality of gray-scale color mapping values of the color component, according to the correlation between the gray-scale value and the plurality of gray-scale color mapping values of the first color component and the plurality of gray-scale color mapping values of the second color component, generates a second a color component offset conversion value and a second color component offset conversion value; and a second color component offset conversion value calculator, which receives the first color component offset conversion value and the second color component offset conversion value , and generate the third color component offset conversion value, and then generate the color offset conversion value.

Another aspect of the present invention is a method for adjusting color values, which is applied to image data. The method includes the following steps: receiving a first RGB color value in the image data, and performing a first operation on the first RGB color value to obtain generating a weight value, and the first RGB color value includes a plurality of color components; receiving the first RGB color value and the weight value, and performing a second operation on the first RGB color value and the weight value to generate a color offset value; and receiving the first RGB color value and the color offset value, and performing a third operation on the first RGB color value and the color offset value to generate a second RGB color value; wherein the first RGB color value An operation includes subtracting the minimum value of the plurality of color components from the maximum value of the plurality of color components to generate a saturation value, and calculating the weight value through a weight function, and the weight function calculation is determined by the saturation threshold , weight threshold, and slope; the second operation is to generate a gray value according to the first RGB color value, and compare the gray value with a color comparison table to generate a color shift conversion value, and according to the the weight value and the color offset conversion value to generate the color offset value; the third operation is to add the first RGB color value and the color offset value by the color adjustment unit to generate the second RGB color value.

According to the color value adjustment method of the present invention, the second operation further includes comparing the gray value with the color comparison table to generate a plurality of gray color mapping values, and according to the gray value and the plurality of gray values The first color component offset conversion value, the second color component offset conversion value, and the third color component offset conversion value are generated by associating the degree color mapping values, and then the color offset conversion value is generated.

According to the color value adjustment method of the present invention, the third operation is to add the first RGB color value and the color offset value to generate the second RGB color value.

The present invention only adjusts the color value of the pixels whose color value range is in the white segment, thereby avoiding the complicated problem in the color adjustment process of the image frame as described in the prior art.

Description of drawings

The present invention obtains a deeper understanding through the following drawings and descriptions:

FIG. 1 is a schematic diagram of a color value adjustment device 10 according to a preferred embodiment of the present invention.

FIG. 2( a ) is a schematic diagram of the weight generating unit 100 .

FIG. 2( b ) is a graph showing the relationship between the weight value and the saturation value used in the preferred embodiment of the present invention.

FIG. 3 is a schematic diagram of the color shift value generation unit 200 .

FIG. 4( a ) is a schematic diagram of the grayscale color conversion unit 220 in the color shift value generation unit 200 .

FIG. 4( b ) is a schematic diagram of the conversion data recorded in the color comparison table 400 .

FIG. 5 is a flowchart of a color value adjustment method using a preferred embodiment of the present invention.

Wherein, the reference signs are explained as follows:

10 Color value adjustment device

100 weight value generating units

110 Saturation value generation unit

111 Maximum value generator

112 Minimum generator

113 Saturation Value Calculator

120 Weight Calculator

200 color shift value generating units

210 gray value generator

211 220 grayscale color conversion unit

221 grayscale color conversion generator

222 First color component offset conversion value calculator

223 second color component offset conversion value calculator

230 Color Shift Value Calculator

300 color adjustment units

400 color comparison table

410, 420 Control conversion data

Detailed ways

Please refer to FIG. 1 , which is a schematic diagram of a color value adjustment device 10 according to a preferred embodiment of the present invention. In this example, the color value adjustment device 10 is applied in an image display device such as a general TV or monitor, and is used to adjust the color content of the image data received by the image display device. The color value adjustment device 10 includes a weight value generation unit 100 , a color offset value generation unit 200 and a color adjustment unit 300 . The weight value generation unit 100 generates a weight value according to the color value of the image data; the color shift value generation unit 200 generates a color shift value according to the color value of the image data and the weight value; and the color adjustment unit 300 According to the color value of the image data and the color offset value, an adjusted color value is generated.

As shown in FIG. 1 , the color value adjustment device 10 is controlled by the enable signal E1. When the enable signal E1 is enabled, the relevant components in the color value adjustment device 10 can only operate, and the enable signal E1 can It is the signal sent by the processor or image processing unit in the image display device.

The first RGB color value of the image data received by the weight value generation unit 100, the color offset value generation unit 200 and the color adjustment unit 300 in the color value adjustment device 10, and in this embodiment, we use RGB The expressions of the three primary colors are defined, that is, the first RGB color value can be represented by (R _in , G _in , B _in ).

In FIG. 1, the weight value generation unit 100 performs a first operation on the first RGB color value (R _in , G _in , B _in ) according to the preset saturation threshold, weight threshold and slope value to generate a weight value W, and send the weight value W to the color shift value generating unit 200. The color offset value generation unit 200 receives the first RGB color value (R _in , G _in , B _in ) and the weight value W, and then queries the preset color comparison table 400, and performs a second operation to generate The color shift value (ΔR, ΔG, ΔB) (also represented by the three primary colors of RGB), and the color shift value (ΔR, ΔG, ΔB) is sent to the color adjustment unit 300 . The color adjustment unit 300 receives the first RGB color value (R _in , G _in , B _in ) and the color shift value (ΔR, ΔG, ΔB), and performs a third operation on it to generate a second RGB color Values (R _out , G _out , B _out ) are output, and the obtained second RGB color values (R _out , G _out , B _out ) are adjusted by the color value adjusting device 10 of the present invention.

As can be known through the known technical experience of adjusting the image color, if we only adjust the white part in the image screen, that is, only adjust the RGB color value in the image screen (in the YUV color) for the gray value in the YUV color. Y refers to brightness (Luminance) (or grayscale), U refers to hue (Hue), V refers to saturation (Saturation), and U and V also represent chroma), except because only adjusting white is less likely to affect In addition to the presentation of other colors, the adjusted result will be easier to achieve the desired effect of the user. Therefore, the present invention is described in terms of the conversion process between the color value and the gray level in the image data, and the operations of each unit and the first, second and third operations are described in detail as follows.

Please refer to FIG. 2( a ), which is a schematic diagram of the weight generating unit 100 . As shown in this figure, in this embodiment, the weight value generation unit 100 also includes: a saturation value generation unit 110 and a weight value calculator 120, wherein the saturation value generation unit 110 also includes: a maximum value generator 111 , a minimum value generator 112 and a saturation value calculator 113, and the maximum value generator 111 and the minimum value generator 112 can receive the first RGB color value (R _in , G _in , B _in ), in this embodiment Among them, R _in , G _in and B _in are three color components in the first RGB color value, and the maximum value generator 111 and the minimum value generator 112 can respectively select one of the three color components The maximum value and the minimum value are output to the saturation value calculator 113 , and the saturation value calculator 113 subtracts the minimum value from the maximum value to generate a saturation value, which is then sent to the weight value calculator 120 .

The weight value calculator 120 can generate the weight value W by calculating the saturation value through a weight function, and the weight function calculation is determined by the aforementioned saturation threshold, the weight threshold and the slope. Please refer to FIG. 2( b ), which is a diagram of the relationship between the weight value and the saturation value used in the preferred embodiment of the present invention. As shown in this figure, when the generated saturation value is greater than or equal to the saturation threshold, the generated weight value W is regarded as 0, and if the generated saturation value is smaller than the saturation threshold, the generated weight value W is The relative weight value can be obtained according to the curve on the graph, which is obtained by subtracting the saturation value generated from the saturation threshold and multiplying it by the slope. And when the weight value exceeds the weight threshold, the weight value is set as the weight threshold.

Please refer to FIG. 3 , which is a schematic diagram of the color shift value generation unit 200 . As shown in this figure, in this embodiment, the color shift value generation unit 200 further includes: a grayscale value generator 210 , a grayscale color conversion unit 220 and a color shift value calculator 230 . Therefore, in this embodiment, the operation of generating the color shift value (ΔR, ΔG, ΔB) by the above-mentioned second operation is as follows: the gray value generator 210 receives the first RGB color value (R _in , G _in , B _in ), while using a set of preset values (α1, α2, α3) to perform linear combination to generate a gray value Y _in (that is, the size of the gray value Y _in can be used (α1×R _in + α2×G _in +α3×B _in ) to represent (wherein α1+α2+α3=1), which is a common conversion formula between RGB color and YUV color in known technology), and by the gray scale After receiving the gray value Y _in , the color conversion unit 220 compares the gray value Y _in with the preset color comparison table 400 to generate color shift conversion values (ΔC1, ΔC2, ΔC3), and The color shift value calculator 230 can receive the color shift conversion value (ΔC1, ΔC2, ΔC3) and the weight value W generated by the weight value calculator 120, and then generate the above-mentioned color shift value ( ΔR, ΔG, ΔB).

The conversion and generation process of the color shift conversion values (ΔC1, ΔC2, ΔC3) in the second operation will now be further described. Please refer to FIG. 4( a ), which is a schematic diagram of the grayscale color conversion unit 220 in the color shift value generation unit 200 . As shown in this figure, in this embodiment, the grayscale color conversion unit 220 also includes: a grayscale color conversion generator 221, a first color component offset conversion value calculator 222 and a second color component offset conversion Value Calculator 223.

As mentioned above, in this embodiment, in order to save the data amount recording space of the color comparison table 400, we can only record the contrast conversion data 410, 420 of two groups of color shift values in the color comparison table 400 (can be It is ΔR and ΔG, ΔG and ΔB, or ΔR and ΔB, that is, the contrast conversion data of a certain two colors in grayscale and RGB three primary colors), and only take part of the grayscale value Y _in to input to the grayscale Color conversion generator 221, for example: if the grayscale value Y _in has M bits, then we only take the data of the first n bits (represented by Y _in [M:n]) and input it to the grayscale color In the conversion generator 221 (ie, the line Y1), the grayscale color conversion generator 221 compares the received data with the color comparison table 400 .

Please also refer to FIG. 4( b ), which is a schematic diagram of the conversion data recorded in the color comparison table 400 . In this embodiment, in order to save the data recording space of the color comparison table 400, we only select two of the three color components as the contrast conversion during the comparison, which can be seen on the ordinate of FIG. Represents the adjustment degree of ΔR (or ΔB or ΔG) comparison, and its corresponding curve can be a preset value; at the same time, it is also for saving the data recording space of the color comparison table 400, the coordinates of Fig. 4(b) The fineness is reduced, as shown in the abscissa of Figure 4(b), the gray value Y _in has 8 bits, and we only take the data of the first 4 bits (so Y _in [M:n] M is 8, n is 4, the size of the data record: 2 ^(M-n+1) is 2 ⁵ ), and the corresponding conversion data is recorded in the color comparison table 400 with this size. Therefore, 16 bits (the upper limit is 2 ⁸ ) are used as interval points on the abscissa in FIG. 4( b ). From the grayscale value Y _in [8:4] received by the grayscale color conversion generator 221 via the line Y1 , a corresponding value of a converted data can be obtained on the table.

However, because the records of this comparison table and the selection of the gray value Y _in are reduced, we must perform interpolation calculations with other corresponding values to obtain the correct conversion result. In this embodiment, the grayscale color conversion generator 221 can generate two grayscale color mapping values ΔC1 _x , ΔC1 _y of one color component and two grayscale color mapping values of another color component through comparison ΔC2 _x , ΔC2 _y , therefore, the first color component offset conversion value calculator 222 is based on the association between the gray level value and the plurality of gray level color mapping values (that is, based on the gray level input via the line Y2 Value Y _in [n-1:0] and the rest of the bit part) are interpolated linearly, therefore, the first color component offset conversion can be obtained after interpolating the grayscale color map values ΔC1 _x and ΔC1 _y value ΔC1, and the second color component offset conversion value ΔC2 can be obtained after interpolating the grayscale color mapping values ΔC2 _x and ΔC2 _y .

Finally, the second color component offset conversion value calculator 223 then linearly combines the first and second color component offset conversion values ΔC1 and ΔC2 according to the two preset values β1 and β2 to generate a third The color component offset conversion value ΔC3 (can be (β1×ΔC1+β2×ΔC2)), so after obtaining the complete offset conversion values of the three color components, it also represents the aforementioned color offset conversion value (ΔC1, ΔC2, ΔC3) are generated.

At the end of the second operation, the color shift conversion value (ΔC1, ΔC2, ΔC3) is received by the color shift value calculator 230, and then processed with the weight value W, for example: the color shift conversion Values (ΔC1, ΔC2, ΔC3) are directly multiplied by the weight value W to generate the aforementioned color shift values (ΔR, ΔG, ΔB). Therefore, in this preferred embodiment of the present invention, we can obtain the original color value of the The color shift value (ΔR, ΔG, ΔB) of how much adjustment is performed.

The last part of this preferred embodiment of the present invention, that is, the third operation, the color adjustment unit 300 combines the first RGB color value (R _in , G _in , B _in ) with the color offset value generated above (ΔR, ΔG, ΔB) is processed, for example: directly add the first RGB color value (R _in , G _in , B _in ) to the color shift value (ΔR, ΔG, ΔB) to generate The above-mentioned second RGB color value (R _out , G _out , B _out ) is obtained. The obtained second RGB color values (R _out , G _out , B _out ) are adjusted by the color value adjusting device 10 of the present invention.

However, in order to save the data recording space of the above-mentioned color comparison table 400, we only record two groups of contrast conversion data 410, 420 in the color comparison table 400, and due to the reduction of recorded data, we set the first and second The two color components are offset by conversion value calculators 222 and 223 to perform calculations such as interpolation and linear combination to obtain complete conversion data between grayscale and color. Using the calculation method of interpolation and linear combination, the detailed data content of the gray value to be converted can be calculated back, and the correct conversion value can be obtained. However, if the recording space in the color comparison table 400 is sufficient, we It is also possible to record all the grayscale color conversion data required by the three color components in the color comparison table 400, and the grayscale color conversion generator 221 can convert the received grayscale value Y _in All the bits represented can be directly compared and converted between grayscale and color, and the color shift conversion value (ΔC1, ΔC2, ΔC3) required in the conversion process can be directly obtained without going through the first The color component offset conversion value calculator 222 performs interpolation, and the second color component offset conversion value calculator 223 performs calculation processes such as linear combination.

Please refer to FIG. 5 , which is a flowchart of a color value adjustment method according to a preferred embodiment of the present invention. First, receive the first RGB color value in the image data (step S01), and generate a saturation value according to the first RGB color value, and then perform weight function calculations to generate the weight value (step S02), secondly, Receive the first RGB color value and the weight value (step S03), and generate a grayscale value according to the first RGB color value, and compare the color table to generate a plurality of grayscale color mapping values (step S04) , and then according to the association between the grayscale value and the plurality of grayscale color mapping values, generate an offset conversion value including the first color component offset, the second color component offset conversion value and the third color component offset conversion value The color shift conversion value (step S05), then, generate a color shift value according to the weight value and the color shift conversion value (step S06), finally, after receiving the first RGB color value and the color shift value After shifting (step S07 ), the two are added together to generate a second RGB color value whose color value has been adjusted (step S08 ).

To sum up, we can use the color value adjustment device and the corresponding method of the present invention to adjust the color value of only pixels within a single color value range in the image data in the image frame. The color value adjustment is only performed on the pixels whose color value range is in the white segment, so as to avoid the complicated problem in the color adjustment process of the image frame as described in the prior art. Therefore, the embodiment of the present invention uses the filter function of the weight value generation unit 100 to select the part that needs to be adjusted, and converts the color value of the RGB color into the gray value in the YUV color, and the gray value and the white color in the image The components are related, and through the preset comparison table, it is possible to know how much color adjustment should be adjusted, so only the white part of the image can be adjusted, and such adjustment can allow users to obtain better visual effects. Therefore, the color value adjustment device and the corresponding method proposed in the present invention can solve the problems raised by the prior art, and successfully achieve the main purpose of the development of the present invention.

The present invention can be changed and modified by those skilled in the art without departing from the intended protection scope of the appended claims.

Claims (11)

1. a chromatic value adjustment mechanism is applied on the view data, and this chromatic value adjustment mechanism includes:

The weighted value generation unit, it receives the first rgb color value in this view data, and this first rgb color value is carried out first computing and produced weighted value, and this first rgb color value includes a plurality of color components;

Color offset value generation unit, it receives this first rgb color value and this weighted value, and this first rgb color value and this weighted value are carried out second computing and produced the color offset value; And

Color adjusting unit, it receives this first rgb color value and this color offset value, and this first rgb color value and this color offset value are carried out the 3rd computing and produced the second rgb color value;

Wherein the maximum that comprises described a plurality of color components of this first computing deducts the minimum value of described a plurality of color components and produces saturation value, and calculate via weighting function, produce this weighted value, and this weighting function calculating is determined by saturation threshold, weight threshold, slope; This second computing comprises and utilizes this first rgb color value to produce gray value, and with this gray value comparison color table of comparisons and produce the color offset conversion value, and produce this color offset value according to this weighted value and this color offset conversion value; The 3rd computing is served as reasons this color adjusting unit with this first rgb color value and this color offset value addition and produce this second rgb color value.

2. chromatic value adjustment mechanism as claimed in claim 1, wherein this weighted value generation unit includes:

The saturation value generation unit, it receives this first rgb color value, and produces this saturation value; And

The weighted value calculator, it receives this saturation value, and calculates via this weighting function, produces this weighted value.

3. chromatic value adjustment mechanism as claimed in claim 2, wherein this saturation value generation unit includes:

The maximum generator, it produces the maximum of described a plurality of color components;

The minimum value generator, it produces the minimum value of described a plurality of color components; And

The saturation value calculator, it produces this saturation value according to this maximum and this minimum value.

4. chromatic value adjustment mechanism as claimed in claim 2, wherein this color offset value generation unit includes:

The gray value generator, it receives this first rgb color value, and produces this gray value;

The gray scale color conversion cell, it receives this gray value, according to this gray value and this color table of comparisons, produces this color offset conversion value; And

Color offset value calculator, it receives this weighted value and this color offset conversion value, and produces this color offset value.

5. chromatic value adjustment mechanism as claimed in claim 4, wherein this gray scale color conversion cell includes:

Gray scale color conversion generator, it receives this gray value, according to this gray value and this color table of comparisons, produces a plurality of gray scale color mapping value of first color component and a plurality of gray scale color mapping value of second color component;

First color component skew conversion value calculator, it receives a plurality of gray scale color mapping value of this first color component and a plurality of gray scale color mapping value of this second color component, related according to a plurality of gray scale color mapping value of related and this gray values of this gray value and a plurality of gray scale color mapping value of this first color component and this second color component produces first color component skew conversion value and is offset conversion value with second color component; And

Second color component skew conversion value calculator, it receives this first color component skew conversion value and this second color component skew conversion value, and produces the 3rd color component and be offset conversion value, and and then produces this color offset conversion value.

6. chromatic value adjustment mechanism as claimed in claim 5, wherein this second computing this gray value generator of serving as reasons carries out a plurality of color components that this first rgb color value is comprised linear combination and produces this gray value, and this gray value and this color table of comparisons are compared and produce described a plurality of gray scale color mapping value by this gray scale color conversion generator, and and then produce this first color component skew conversion value according to this gray value and the related linear combination of carrying out interpolation of described a plurality of gray scale color mapping value and this second color component is offset conversion value by this first color component skew conversion value calculator, and this first color component skew conversion value and this second color component skew conversion value are carried out linear combination and produce the 3rd color component being offset conversion value by this second color component skew conversion value calculator, and then become this color offset conversion value, and by this color offset value calculator this weighted value and this color offset conversion value are multiplied each other again and produce this color offset value.

7. chromatic value adjustment mechanism as claimed in claim 3, wherein this color offset value generation unit includes:

The gray value generator, it receives this first rgb color value, and produces this gray value;

The gray scale color conversion cell, it receives this gray value, according to this gray value and this color table of comparisons, produces this color offset conversion value; And

Color offset value calculator, it receives this weighted value and this color offset conversion value, and produces this color offset value.

8. chromatic value adjustment mechanism as claimed in claim 7, wherein this gray scale color conversion cell includes:

Gray scale color conversion generator, it receives this gray value, according to this gray value and this color table of comparisons, produces a plurality of gray scale color mapping value of first color component and a plurality of gray scale color mapping value of second color component;

First color component skew conversion value calculator, it receives a plurality of gray scale color mapping value of this first color component and a plurality of gray scale color mapping value of this second color component, related according to a plurality of gray scale color mapping value of related and this gray values of this gray value and a plurality of gray scale color mapping value of this first color component and this second color component produces first color component skew conversion value and is offset conversion value with second color component; And

Second color component skew conversion value calculator, it receives this first color component skew conversion value and this second color component skew conversion value, and produces the 3rd color component and be offset conversion value, and and then produces this color offset conversion value.

9. a chromatic value adjustment mechanism is applied on the view data, and this chromatic value adjustment mechanism includes:

The weighted value generation unit, it receives the first rgb color value in this view data, and this first rgb color value is carried out first computing and produced weighted value, and this first rgb color value includes a plurality of color components;

Color offset value generation unit includes:

The gray value generator, it receives this first rgb color value, and produces gray value;

The gray scale color conversion cell, it receives this gray value, according to this gray value and the color table of comparisons, produces the color offset conversion value; And

Color offset value calculator, it receives this weighted value and this color offset conversion value, and produces this color offset value; And

Color adjusting unit, it receives this first rgb color value and this color offset value, and this first rgb color value and this color offset value are carried out the 3rd computing and produced the second rgb color value,

Wherein the maximum that comprises described a plurality of color components of this first computing deducts the minimum value of described a plurality of color components and produces saturation value, and calculate via weighting function, produce this weighted value, and this weighting function calculating is determined by saturation threshold, weight threshold, slope; The 3rd computing is served as reasons this color adjusting unit with this first rgb color value and this color offset value addition and produce this second rgb color value.

10. a color-values method of adjustment is applied on the view data, and it is as follows that this method comprises step:

Receive the first rgb color value in this view data, and this first rgb color value is carried out first computing and produced weighted value, and this first rgb color value includes a plurality of color components;

Receive this first rgb color value and this weighted value, and this first rgb color value and this weighted value are carried out second computing and produced the color offset value; And

Receive this first rgb color value and this color offset value, and this first rgb color value and this color offset value are carried out the 3rd computing and produced the second rgb color value;

Wherein the maximum that comprises described a plurality of color components of this first computing deducts the minimum value of described a plurality of color components and produces saturation value, and calculate via weighting function, produce this weighted value, and this weighting function calculating is determined by saturation threshold, weight threshold, slope; This second computing is for producing gray value according to this first rgb color value, and with this gray value comparison color table of comparisons and produce the color offset conversion value, and produce this color offset value according to this weighted value and this color offset conversion value; The 3rd computing is for producing this second rgb color value by color adjusting unit with this first rgb color value and this color offset value addition.

11. color-values method of adjustment as claimed in claim 10, wherein this second computing also comprises this gray value is compared this color table of comparisons and produced a plurality of gray scale color mapping value, and related according to this gray value and described a plurality of gray scale color mapping value, produce first color component skew conversion value, second color component skew conversion value is offset conversion value with the 3rd color component, and and then produces this color offset conversion value.

Images