CN101827205B - Video signal correction device and method and its electronic device - Google Patents

Abstract

The invention discloses a video signal correction device and method and an electronic device thereof. The video signal correction apparatus includes: the device comprises a receiving unit, a decoding unit, a storage unit and a processing unit. The receiving unit receives the video signal, and decodes the video signal into a television signal according to the type of the video signal by using the decoding unit. The storage unit may store a plurality of correction parameters corresponding to different television signals. The processing unit performs correction operation on the television signal according to the video display parameter and the correction parameter corresponding to the television signal to generate a display signal, so that the details of the dark part of the video signal can be presented in the picture of the display.

Description

Video signal correction device and method and its electronic device

technical field

The present invention relates to a video signal correction device and method and its electronic device, in particular to a video signal correction device and method for TV signal grayscale level correction and its electronic device.

Background technique

Currently, digital video disc (DVD) players on the market have a variety of video signals, and the output video signal types can be roughly divided into National Television System Committee (NTSC) format and Phase Alternate Line (PAL) format. General video decoders can distinguish different formats of such signals, but the detailed signal level changes cannot be automatically judged. For example, the distribution of the dark part of the NTSC-M signal format does not start from the zero level, and there is an offset to increase the gray level of the dark part of the signal.

FIG. 1 is a schematic diagram of a video signal in a grayscale level format of a general dark part signal, which includes a synchronous square wave and a video signal body. FIG. 2 is a schematic diagram of a video signal in a grayscale level pad format with a dark part signal. The main purpose of raising the gray level of the dark signal is to resist noise interference. For example, commonly used signals (such as NTSC-M format) have a video signal format in which the gray level of the dark signal is raised. When playing these video signals, the existing correction methods must be pre-set by the video decoder, directly cut off the signal with a high gray level, and then correct the signal level to the full range. Otherwise, the dark details of the display screen will be too bright.

A video signal format with a high gray level of the dark signal, such as: NTSC-M signal format, NTSC-433 signal format, PAL-M signal format and PAL-N signal format; the gray level of the general dark signal The video signal format (the gray scale level is not raised) includes, for example, the PAL-BG signal format and the NTSC-J signal format. However, the current video decoder cannot completely judge the signal format of these details, so it is impossible to fully know whether the gray level of the dark part of the video signal has been raised, so the general gray level correction method of the dark part of the signal often cuts off the signal by mistake , so that the user sees a black picture, and the signal that has been cut off cannot be restored.

Therefore, the present invention proposes a video signal correction device and its method, so that the details of the dark part of the signal will not be cut off during the correction process. Screen Display) interface brightness and contrast control to restore the grayscale details of the dark part, so that the details of the dark part of the video signal can be presented on the display screen.

Contents of the invention

In view of the above-mentioned problems in the prior art, the object of the present invention is to provide a video signal correction device and method and its electronic device, to solve the problem that the general video signal grayscale level correction method often mistakenly cuts off the signal , so that the details of the dark part of the video signal can be kept intact.

According to another object of the present invention, a video signal correction device is proposed, the video signal correction device includes a receiving unit, a decoding unit, a storage unit and a processing unit. The receiving unit receives the video signal, and uses the decoding unit to decode the video signal into a TV signal according to the type of the video signal. The storage unit can store a plurality of correction parameters corresponding to different television signals. This correction parameter can be used to correct the offset contained in the video signal. Finally, the processing unit performs correction calculation on the TV signal according to the video display parameters and the corresponding correction parameters of the TV signal to generate a display signal and output it to the display unit, so that the details of the dark part of the signal will not be cut off during the correction process .

Wherein, the video display parameter is a parameter capable of converting the TV signal from the YCbCr signal format to the RGB signal format.

Wherein, the video signal correction device also includes a color control unit capable of controlling signal color, contrast and brightness. The processing unit corrects the TV signal according to the color control parameters stored in the color control unit, the video display parameters and the corresponding correction parameters of the TV signal, so as to control the brightness, contrast, saturation and hue of the display signal.

According to another object of the present invention, a method for correcting a video signal is proposed, which includes the following steps. The video signal is received by the receiving unit, and then decoded into a television signal by the decoding unit according to the type of the video signal. And the correction parameters corresponding to the TV signal stored in the storage unit are taken out by the processing unit. This correction parameter can be used to correct the offset contained in the video signal. Finally, according to the video display parameters and the corresponding correction parameters of the TV signal, the processing unit is used to correct the TV signal to generate a display signal, and the display unit displays the display signal.

Wherein, the video display parameter is a parameter capable of converting the TV signal from the YCbCr signal format to the RGB signal format.

Among them, the processing unit corrects the TV signal according to the color control parameters that can control the signal color, contrast and brightness, the video display parameters and the corresponding correction parameters of the TV signal, so as to control the brightness, contrast, saturation and hue of the display signal.

According to yet another object of the present invention, an electronic device with a video signal correction device is proposed. The electronic device includes a video signal correction device and a display unit, and the video signal correction device includes a receiving unit, a decoding unit, a storage unit and a processing unit. The receiving unit is used to receive the video signal, and use the decoding unit to decode the video signal into a TV signal according to the type of the video signal. The storage unit can store a plurality of correction parameters corresponding to different television signals. Finally, the processing unit performs correction calculation on the TV signal according to the video display parameters and the corresponding correction parameters of the TV signal to generate a display signal and output it to the display unit of the electronic device, so that the details of the dark part of the signal will not be changed during the correction process. was chopped off.

Wherein, the video display parameter is a parameter capable of converting the TV signal from the YCbCr signal format to the RGB signal format.

Wherein, the video signal correction device also includes a color control unit capable of controlling signal color, contrast and brightness. The processing unit corrects the TV signal according to the color control parameters stored in the color control unit, the video display parameters and the corresponding correction parameters of the TV signal, so as to control the brightness, contrast, saturation and hue of the display signal.

In summary, according to the video signal correction device and method and its electronic device of the present invention, it may have one or more of the following advantages:

(1) The present invention can improve the problem that the current video decoder cannot fully judge whether the gray scale level of the video dark part signal has been raised, so the details of the video dark part signal are cut off.

(2) The present invention prevents loss of grayscale of the signal through the correction mechanism of the system back-end scaler. Even if the system is wrongly calibrated, the user can still manually adjust the brightness and contrast controls in the OSD interface of the monitor to restore the grayscale details of the dark part.

Description of drawings

FIG. 1 is a schematic diagram of a video signal in a grayscale level format of a general dark part signal;

Fig. 2 is a schematic diagram of a video signal in a grayscale level pad format with a dark part signal;

Fig. 3 is the block diagram of video signal correcting device of the present invention;

Fig. 4 is the flow chart of steps of the video signal correction method of the present invention; And

FIG. 5 is a flow chart of the steps of another embodiment of the video signal correction method of the present invention,

Among them, 1 denotes a video signal correction device, 11 denotes a receiving unit, 111 denotes a video signal, 112 denotes a TV signal, 113 denotes a display signal, 12 denotes a decoding unit, 13 denotes a storage unit, 131 denotes a correction parameter, 14 denotes a processing unit, 141 Denotes video display parameters, 15 denotes a display unit, 16 denotes a color control unit, 161 denotes color control parameters, and S1-S5, S11-S51 denote steps.

Detailed ways

Please refer to FIG. 3 , which is a block diagram of the video signal correction device of the present invention. In the figure, the video signal correction device 1 includes: a receiving unit 11 , a decoding unit 12 , a storage unit 13 , a processing unit 14 and a display unit 15 . The receiving unit 11 can be used to receive a video signal 111 , wherein the video signal 111 can be an analog signal, and the signal type can be in NTSC format or PAL format. The decoding unit 12 can be a video decoder, and decodes the video signal 111 into a TV signal 112 according to the type of the received video signal 111 . The storage unit 13 stores a plurality of correction parameters 131 corresponding to the television signal 112. The correction parameters 131 can be used to correct the offset included in the video signal 111, and can be matrix parameters. The processing unit 14 can perform correction operation on the TV signal 112 according to the video display parameter 141 and the corresponding correction parameter 131 of the TV signal 112 to generate a corrected display signal 113 in RGB signal format, and output it to the display unit 15 . Wherein, the video display parameter 141 is a parameter capable of converting the TV signal 112 from a YCbCr signal format to an RGB signal format, and the video display parameter 141 may be a matrix parameter.

The video signal correction device 1 further includes a color control unit 16 capable of controlling signal brightness, contrast, saturation and hue. The color control unit 16 can be an OSD interface of a display, and the color control unit 16 stores a color control parameter 161, and the color control parameter 161 can be a matrix parameter. The processing unit 14 can further perform correction calculation on the TV signal 112 according to the color control parameter 161, the video display parameter 141 and the corresponding correction parameter 131 of the TV signal 112, so as to control the brightness, contrast, saturation and hue of the corrected display signal 113 .

When the receiving unit 11 receives a video signal 111, such as an analog video signal, the decoding unit 12 decodes and converts the video signal 111 received by the receiving unit 11 into a digital television signal according to the type (NTSC format or PAL format) of the received video signal 111 112. The processing unit 14 can operate on the decoded TV signal 112 according to the video display parameters 141, and convert the TV signal 112 in YCbCr format into a display signal 113 in RGB format, such as [YCbCr1]T→[RGB1]T. Wherein the video display parameter 141 may be as shown in formula (1).

$\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 11</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 12</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 13</span>}}& {\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; offset</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; three</span>}}& {\mathrm{<span\; class="notranslate">\; G</span>}}_{\mathrm{<span\; class="notranslate">\; offset</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 31</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 32</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 33</span>}}& {\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; offset</span>}}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

The converted display signal 113 in RGB format can be shown in formula (2).

$\left[\begin{array}{c}\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="R\; G\; B"\; filenames="H2009101184105E00031.png"\; state="\{\{state\}\}">R</figure-callout></span><figure-callout\; id="1"\; label="R\; G\; B"\; filenames="H2009101184105E00031.png"\; state="\{\{state\}\}">\; </figure-callout>}& \\ \mathrm{<span\; class="notranslate">\; G</span>}\\ \mathrm{<span\; class="notranslate">\; B</span>}\\ \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]<span\; class="notranslate">\; =</span>\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 11</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 12</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 13</span>}}& {\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; offset</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; three</span>}}& {\mathrm{<span\; class="notranslate">\; G</span>}}_{\mathrm{<span\; class="notranslate">\; offset</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 31</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 32</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 33</span>}}& {\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; offset</span>}}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]\left[\begin{array}{c}\mathrm{<span\; class="notranslate">\; Y</span>}\\ \mathrm{<span\; class="notranslate">\; Cb</span>}\\ \mathrm{<span\; class="notranslate">\; Cr</span>}\\ \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

The processing unit 14 can determine whether to start signal correction according to the type of the video signal 111 determined by the decoding unit 12 . In this embodiment, the manner of determining whether to start signal correction is as follows:

It is impossible to know the detailed standards of all signals by using the decoding information of the decoding unit 12, and it can be roughly distinguished that the signal standards are two types: NTSC and PAL. For the PAL standard, PAL-M and PAL-N, which appear less frequently, have raised gray levels in the dark part, and the most common one is PAL-BG, which has no raised gray level in the dark part, so when the signal standard is PAL, the system does not Start signal correction.

For the NTSC system, NTSC-433, which appears rarely, can be detected from the decoding unit 12, and the gray scale of the dark part is raised, so the system will start signal correction; the most common NTSC-J and NTSC-M cannot be detected from the decoding unit 12 It is known that the gray scale of the dark part of NTSC-J is not raised, and the gray scale of the dark part of NTSC-M is raised. The probability of NTSC-M is higher, so for NTSC standards other than NTSC-433, the system starts signal correction.

If the signal correction is started, the correction parameter 131 corresponding to the TV signal 112 stored in the storage unit 13 is retrieved.

The processing unit 14 can perform a correction operation on the TV signal 112 according to the video display parameter 141 and the correction parameter 131 corresponding to the TV signal 112 to generate a corrected display signal 113 . Through this operation, the TV signal 112 with YCbCr format can be converted into a corrected display signal 113 with RGB format, such as [RGB1]T→[R'G'B'1]T, wherein the correction parameter 131 can be as follows Formula (3) shown.

$\left[\begin{array}{cccc}\mathrm{<span\; class="notranslate">\; 1.08</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& <span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 19</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1.08</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& <span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 19</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1.08</span>}& <span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 19</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

The corrected display signal 113 in RGB format can be shown in formula (4).

$\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; R</span>}}^{<span\; class="notranslate">\; \&prime;</span>}\\ {\mathrm{<span\; class="notranslate">\; G</span>}}^{<span\; class="notranslate">\; \&prime;</span>}\\ {\mathrm{<span\; class="notranslate">\; B</span>}}^{<span\; class="notranslate">\; \&prime;</span>}\\ \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]<span\; class="notranslate">\; =</span>\left[\begin{array}{cccc}\mathrm{<span\; class="notranslate">\; 1.08</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& <span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 19</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1.08</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& <span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 19</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1.08</span>}& <span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 19</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 11</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 12</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 13</span>}}& {\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; offset</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; three</span>}}& {\mathrm{<span\; class="notranslate">\; G</span>}}_{\mathrm{<span\; class="notranslate">\; offset</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 31</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 32</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 33</span>}}& {\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; offset</span>}}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]\left[\begin{array}{c}\mathrm{<span\; class="notranslate">\; Y</span>}\\ \mathrm{<span\; class="notranslate">\; Cb</span>}\\ \mathrm{<span\; class="notranslate">\; Cr</span>}\\ \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

Since the detailed formats of all signals cannot be known from the decoding information of the decoding unit 12, system correction errors may occur. Since correcting the details of the dark part of the signal by means of digital signal matrix operation will not change the original signal level, that is, the details of the dark part of the [YCbCr1]T signal in this embodiment are not lost, so when a system correction error occurs In addition, the user can still adjust the color control parameter 161 in the color control unit 16 to recover the grayscale details of the dark part and achieve any grayscale presentation. In this embodiment, the user adjusts the color control parameter 161 through the OSD interface of the display.

The processing unit 14 operates on the TV signal 112 according to the color control parameter 161 , the video display parameter 141 and the correction parameter 131 corresponding to the TV signal 112 to generate a display signal 113 , as shown in formula (5).

$\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; R</span>}}^{<span\; class="notranslate">\; \&prime;</span><span\; class="notranslate">\; \&prime;</span>}\\ {\mathrm{<span\; class="notranslate">\; G</span>}}^{<span\; class="notranslate">\; \&prime;</span><span\; class="notranslate">\; \&prime;</span>}\\ {\mathrm{<span\; class="notranslate">\; B</span>}}^{<span\; class="notranslate">\; \&prime;</span><span\; class="notranslate">\; \&prime;</span>}\\ \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]<span\; class="notranslate">\; =</span>\left[\begin{array}{cccc}\mathrm{<span\; class="notranslate">\; 1.08</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& <span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 19</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1.08</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& <span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 19</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1.08</span>}& <span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 19</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]\left[\begin{array}{cccc}{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 11</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 12</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 13</span>}}& {\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; offset</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; one</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; two</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; twenty\; three</span>}}& {\mathrm{<span\; class="notranslate">\; G</span>}}_{\mathrm{<span\; class="notranslate">\; offset</span>}}\\ {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 31</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 32</span>}}& {\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; 33</span>}}& {\mathrm{<span\; class="notranslate">\; B</span>}}_{\mathrm{<span\; class="notranslate">\; offset</span>}}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]\left[\begin{array}{cccc}\mathrm{<span\; class="notranslate">\; G</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; B</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}& <span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}& \mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]\left[\begin{array}{c}\mathrm{<span\; class="notranslate">\; Y</span>}\\ \mathrm{<span\; class="notranslate">\; Cb</span>}\\ \mathrm{<span\; class="notranslate">\; Cr</span>}\\ \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

Wherein the color control parameter 161 is shown in formula (6).

$\left[\begin{array}{cccc}\mathrm{<span\; class="notranslate">\; G</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; B</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}& <span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}& \mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; cos</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}\\ \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 0</span>}& \mathrm{<span\; class="notranslate">\; 1</span>}\end{array}\right]<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

G in formula (6) represents the contrast of the control video, B represents the brightness of the control video, S represents the saturation of the control video, and θ represents the hue of the control video.

Please refer to FIG. 4 , which is a flow chart of steps of the video signal correction method of the present invention. In step S1, a receiving unit is used to receive a video signal, wherein the video signal may be an analog signal, and the type of the video signal may be in NTSC format or PAL format. In step S2, the decoding unit decodes the received video signal into a television signal according to the type of the video signal. The decoding unit can be a video decoder, and the analog video signal can be converted into a digital TV signal by the decoding unit.

Therefore, in step S3, the processing unit retrieves the correction parameter corresponding to the TV signal stored in the storage unit according to the video signal type determined by the decoding unit, wherein the correction parameter can be used to correct the offset contained in the video signal. In step S4, the processing unit performs a correction operation on the TV signal according to the video display parameters and the correction parameters corresponding to the TV signal, and converts the TV signal into a corrected display signal, wherein the video display parameter is the TV signal by Parameters for converting YCbCr signal format to RGB signal format. The offset contained in the video signal is corrected by this correction operation, so that there is no need to directly adjust the signal levels of Y, Cb, and Cr to correct the grayscale level of the dark part of the video signal. In step S5, the generated display signal having corrected RGB signal format is transmitted to the display unit. Finally, the video signal is displayed by the display unit.

Please refer to FIG. 5 , which is a flow chart of steps of another embodiment of the video signal correction method of the present invention. In step S11, the video signal is received by the receiving unit, wherein the video signal can be an analog signal, and the signal type can include NTSC or PAL format. In step S21, according to the type of the video signal, the decoding unit decodes the video signal into a TV signal, wherein the TV signal can be a digital signal.

In step S31, the processing unit determines whether to perform a correction operation on the video signal according to the type of the video signal obtained from the decoding unit. In step S41, when the processing unit decides to perform correction, the processing unit can perform correction calculation on the TV signal according to the color control parameters, video display parameters and correction parameters corresponding to the TV signal stored in the storage unit, and the TV signal Convert from YCbCr format signal to RGB format display signal. Among them, the color control parameters are used to change the brightness, contrast, saturation and hue of the display signal to achieve any grayscale presentation of the display signal. In step S411, when the processing unit decides not to perform correction, the processing unit performs calculations on the TV signal according to the color control parameters and video display parameters, and converts the TV signal in YCbCr format into a display signal in RGB format. In step S51, the display signal generated by the processing unit is transmitted to the display unit, and the display signal is presented by the display unit.

The above description is for illustration only, not for limitation. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the patent scope of the application.

Claims (12)

1. image signal correction apparatus, it comprises:

Receiving element, receiving video signals;

Decoding unit is decoded into TV signal according to the type of this vision signal with vision signal;

Memory cell is stored the correction parameter of a plurality of corresponding different television signals; And

Processing unit; When the type of this vision signal of learning according to this decoding unit determines to carry out timing; This processing unit is according to video display parameters and be stored in this memory cell and the corresponding correction parameter of this TV signal, comes TV signal is carried out correction calculation to produce a shows signal; The type of this vision signal of learning according to this decoding unit when this processing unit determines not carry out timing, comes TV signal is carried out computing to produce this shows signal according to video display parameters.

2. image signal correction apparatus as claimed in claim 1 is characterized in that, this correction calculation can't influence the accurate position of GTG of this TV signal.

3. image signal correction apparatus as claimed in claim 1 is characterized in that, this video display parameters is for being converted to this TV signal the parameter of rgb signal form by YCbCr signal format.

4. image signal correction apparatus as claimed in claim 1 is characterized in that, also comprises: color controlling unit, utilize the color Control Parameter, and control brightness, contrast, saturation and the form and aspect of this shows signal.

5. image signal correction method comprises the following step:

Utilize the receiving element receiving video signals;

Decoding unit is decoded into TV signal according to the type of this vision signal with this vision signal;

Take out the correction parameter corresponding that memory cell is stored by processing unit with this TV signal;

The type of this vision signal of learning according to this decoding unit when processing unit determines to carry out timing; This processing unit is according to video display parameters and be stored in this memory cell and the corresponding correction parameter of this TV signal, comes TV signal is carried out correction calculation to produce a shows signal;

The type of this vision signal of learning according to this decoding unit when this processing unit determines not carry out timing, comes TV signal is carried out computing to produce this shows signal according to video display parameters; And by this shows signal of display unit demonstration.

6. image signal correction method as claimed in claim 5 is characterized in that, this correction calculation can't influence the accurate position of GTG of this TV signal.

7. image signal correction method as claimed in claim 5 is characterized in that, this video display parameters is for being converted to this TV signal the parameter of rgb signal form by YCbCr signal format.

8. image signal correction method as claimed in claim 5 is characterized in that, further utilizes the color Control Parameter to control the brightness of this shows signal, contrast, saturation and form and aspect.

9. electronic installation with image signal correction apparatus, it comprises:

Image signal correction apparatus, it comprises: receiving element, receiving video signals; Decoding unit is decoded into TV signal according to the type of this vision signal with vision signal; Memory cell is stored the correction parameter of a plurality of corresponding different television signals; Processing unit; When the type of this vision signal of learning according to this decoding unit determines to carry out timing; This processing unit is according to video display parameters and be stored in this memory cell and the corresponding correction parameter of this TV signal, comes TV signal is carried out correction calculation to produce a shows signal; The type of this vision signal of learning according to this decoding unit when this processing unit determines not carry out timing, comes TV signal is carried out computing to produce this shows signal according to video display parameters; And

Display unit presents this shows signal.

10. the electronic installation with image signal correction apparatus as claimed in claim 9 is characterized in that, this correction calculation can't influence the accurate position of GTG of this TV signal.

11. the electronic installation with image signal correction apparatus as claimed in claim 9 is characterized in that, this video display parameters is for being converted to this TV signal the parameter of rgb signal form by YCbCr signal format.

12. the electronic installation with image signal correction apparatus as claimed in claim 9; It is characterized in that; This image signal correction apparatus further comprises: color controlling unit, utilize the color Control Parameter, and control brightness, contrast, saturation and the form and aspect of this shows signal.

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