CN103309469B - Displacement detection device and method of operation thereof - Google Patents
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Abstract
一种位移检测装置，包含图像传感器、光源、光源控制单元和处理单元。所述图像传感器以取样频率获取图像帧。所述光源以速度模式提供所述图像传感器获取图像帧时所需的光。所述光源控制单元以所述速度模式控制所述光源以发光频率点亮或连续熄灭。所述处理单元根据所述光源点亮时所获取的图像帧计算位移量来作为所述光源熄灭期间的预估位移量。本发明还提供一种位移检测装置的操作方法。
A displacement detection device comprises an image sensor, a light source, a light source control unit and a processing unit. The image sensor acquires image frames at a sampling frequency. The light source provides the light required by the image sensor to acquire image frames in a speed mode. The light source control unit controls the light source to light up or continuously turn off at a light frequency in the speed mode. The processing unit calculates a displacement amount based on the image frames acquired when the light source is on as an estimated displacement amount during the period when the light source is off. The present invention also provides an operation method of the displacement detection device.
Description
Technical field
The present invention relates to a kind of interactive device, particularly a kind of displacement detector and method of operating thereof.
Background technology
Connect the signal wire of main frame because wireless optical mouse does not have, thus significantly improve its operation ease, during input media especially as removable computer, instead of traditional wire mouse gradually especially.But, wireless optical mouse generally comprises the active members such as light source, digital signal processor (DigitalSignalProcessor), imageing sensor and wireless transmission unit, its overall power consumption is large, thus has the problem of battery deficiency.
In order to head it off, the known consumption electric energy that can be reduced wireless optical mouse by the Image Acquisition frequency and the mode of time shutter changing imageing sensor; But in actual use, this kind of mode at least has following point: because the time shutter of imageing sensor can change along with the translational speed of optical mouse, cause the overall brightness of obtained image can produce larger variation, and there is poor stability.
The glow frequency of the mode of another kind of known reduction wireless optical mouse power consumption for a change light source.Such as with reference to shown in Fig. 1, according to the displacement of wireless optical mouse, the glow frequency of light source such as can be fixed as 3000/second, 1500/second or 1000/second respectively.But in this mode of operation, often kind of glow frequency still can consume different electric currents, the electric current of such as fast mode consumption can be 3 times of low-speed mode.
Given this, the present invention also proposes a kind of displacement detector and method of operating thereof, and it can change the light-emitting mode of light source according to different displacement, to reduce the entirety power consumption of displacement detector further.
Summary of the invention
The object of this invention is to provide a kind of displacement detector and method of operating thereof, it changes the light-emitting mode of light source according to different displacement or translational speed, makes often kind of light-emitting mode have identical low consumption electric current.
The invention provides a kind of displacement detector, this displacement detector comprises imageing sensor, light source, light source control unit and processing unit.Described imageing sensor obtains picture frame with sampling frequency.Required light when described light source provides described imageing sensor to obtain picture frame with at least one velocity mode.Described light source control unit to be lighted with glow frequency with light source described in described speed-mode control or is extinguished continuously.Described processing unit according to the picture frame displacement calculating amount obtained during described light source igniting be used as described light source extinguish during estimate displacement.
The present invention also provides a kind of method of operating of displacement detector, and this method of operating comprises the following step: utilize imageing sensor to obtain picture frame with sampling frequency; Control light source light with at least one glow frequency or extinguish continuously; With utilize processing unit according to the picture frame displacement calculating amount obtained during described light source igniting be used as described light source extinguish during estimate displacement.
The present invention also provides a kind of method of operating of displacement detector, and this method of operating comprises the following step: utilize imageing sensor to obtain picture frame with sampling frequency; Light source synchronous is utilized to light continuously in described sampling frequency; Processing unit is utilized also to determine the velocity mode of described light source according to this according to the picture frame displacement calculating amount that described imageing sensor obtains; Control described light source light with described velocity mode or extinguish continuously; With utilize described processing unit according to the picture frame displacement calculating amount obtained during described light source igniting be used as described light source extinguish during estimate displacement.
In embodiment of the present invention, described light source is opened picture frame corresponding to N and is lighted continuously, then opens picture frame corresponding to M and extinguishes continuously.
In a kind of embodiment, institute's displacement sensing device also comprises transmission interface unit and exports described displacement with report rate and describedly estimate displacement, and wherein (M+N) is preferably less than or equal to the business of a frame per second divided by described report rate gained of described light source; And N is preferably greater than or equal to 4.
In a kind of embodiment, described processing unit also calculates the image quality that described N opens picture frame, when described image quality not good (such as lower than quality threshold value), increases the numerical value of N.
In a kind of embodiment, under different velocity modes, to light number of times all identical for described light source per second, and under low-speed mode, the numerical value of N is preferably greater than the numerical value of N under fast mode.
In a kind of embodiment, described processing unit also switches described velocity mode immediately according to described displacement.
In displacement detector of the present invention and method of operating thereof, because the numerical value of N can change according to the image quality of the velocity mode of described light source and picture frame, effectively can increase the counting accuracy of displacement.Light number of times due to described light source per second can be designed to be equal to the per second of minimum speed pattern and light number of times, effectively can reduce overall power consumption.
Accompanying drawing explanation
Fig. 1 illustrates the Image Acquisition of known optical mouse and the schematic diagram of light source igniting.
Fig. 2 A illustrates the schematic diagram of the displacement detector of embodiment of the present invention.
Fig. 2 B illustrates the block scheme of the displacement detector of embodiment of the present invention.
Fig. 3 A illustrates the friction speed pattern of the light source of the displacement detector of embodiment of the present invention.
Fig. 3 B illustrates that the displacement detector of embodiment of the present invention calculates the maximum schematic diagram detecting displacement.
Fig. 3 C illustrates in the displacement detector of embodiment of the present invention, effective frame per second and corresponding maximum can detection speed.
Fig. 4 A illustrates the Image Acquisition of the displacement detector of embodiment of the present invention and the schematic diagram of light source igniting.
Fig. 4 B illustrates in the displacement detector of embodiment of the present invention, light source per second light number of times and corresponding maximum can detection speed.
Fig. 5 A-5B illustrates the process flow diagram of the method for operating of the displacement detector of embodiment of the present invention.
Description of reference numerals
10 displacement detector 100 housings
101 light source 102 light source control units
103 imageing sensor 104 mnemons
105 processing unit 106 transmission interface unit
107,108 optical element 20 first images
21 with reference to search box 30 second image
31 search box I
1, I
2picture frame
S
11-S
15step S
21-S
27step
S working surface H perforate
Embodiment
More obviously, hereafter cooperation accompanying drawing can be elaborated to allow above and other objects of the present invention, feature and advantage.In explanation of the present invention, identical component represents with identical symbol, first illustrates at this.
Shown in Fig. 2 A and 2B, Fig. 2 A illustrates the schematic diagram of the displacement detector of embodiment of the present invention, Fig. 2 B illustrates the block scheme of the displacement detector of embodiment of the present invention, though wherein displacement detector 10 is depicted as optical mouse, the present invention is not limited to this; Such as displacement detector 10 also can be optics finger navigation.
Institute's displacement sensing device 10 comprises light source 101, light source control unit 102, imageing sensor 103, mnemon 104, processing unit 105 and transmission interface unit 106; In other embodiment, institute's displacement sensing device 10 also can comprise optical element 107, this optical element 107 is for adjusting the illumination zone of described light source 101, and optical element 108, and this optical element 108 is for adjusting the light receiving efficiency of described imageing sensor 103.
Described imageing sensor 103 can be such as ccd image sensor, cmos image sensor or other is for obtaining the sensing device of image document, and it obtains picture frame with fixing sampling frequency.
Described light source 101 can be such as light emitting diode or laser diode, infrared light or invisible light is sent with at least one velocity mode, light required when obtaining picture frame for providing described imageing sensor 103 is such as by the perforate H illumination work surface S on the bottom surface of the housing 100 of institute's displacement sensing device 10 herein.In addition, when institute's displacement sensing device 10 is optics finger navigation, described light source 101 is for the finger surface that throws light on.
Described light source control unit 102 to be lighted with at least one glow frequency with different velocity modes for controlling described light source 101 or to extinguish continuously; Under chosen velocity mode, such as control the sampling frequency luminescence that described light source 101 corresponds to (can be synchronous or asynchronous) described imageing sensor 103, open after picture frame lights continuously to correspond to N, then open picture frame corresponding to M to extinguish continuously, repeatable operation like this is to save the power consumption of light source 101 during opening picture frame at described M, and wherein under friction speed pattern, the number of times of lighting per second of described light source 101 is preferably designed for identical (after being specified in).
Described mnemon 104 couples described processing unit 105, for storing displacement (speed) threshold value, quality threshold value and other systematic parameter.
Described processing unit 105 such as can come displacement calculating amount or translational speed according to the correlativity (correlation) between two images, and the current displacement of comparison and described displacement threshold value (or at present translational speed and described threshold speed), and described light source 101 is controlled by described light source control unit 102 according to comparative result, to carry out the switching of friction speed pattern; Wherein, as long as described processing unit 105 can process the processor of image document, such as digital signal processor (DSP), there is no specific restriction.In embodiment of the present invention, the picture frame displacement calculating amount obtained when described processing unit 105 is lighted according to described light source 101, be used as described light source 101 extinguish during estimate displacement.Such as, in a kind of embodiment, described processing unit 105 can open picture frame displacement calculating amount or average displacement amount according to described N, to estimate displacement during opening picture frame as described M, does not so just need displacement calculating amount during M opens picture frame; That is the picture frame that described light source 101 obtains during extinguishing can be given up.Described processing unit 105 can also carry out the switching of described velocity mode according to described displacement.In addition, described processing unit 105 can also determine the numerical value of N, such as, calculate the image quality that described N opens picture frame, when described image quality is lower than the numerical value increasing N during quality threshold value; That is, preferably obtain more effective image frame continuously when image quality is not good with what avoid obtaining mistake and estimate threshold value; Wherein, the definition of described image quality has been known, therefore repeats no more in this.In addition, described processing unit 105 can also control described light source 101 by described light source control unit 102 and has larger N value at low-speed mode than fast mode.
Described transmission interface unit 106 with report rate (reportrate) by action message (such as, displacement, average displacement amount or translational speed) and estimate action message (such as, estimate displacement, estimate average displacement amount or estimate translational speed) wire or wirelessly output to external electronic, such as computer system or comprise the electronic system of display unit, to carry out corresponding control; Wherein, described transmission interface unit 106 can be such as wired or wireless transport interface, and its report rate is such as 125/second or 120/second, but the present invention is not limited to this.
First, illustrate in displacement detector 10 of the present invention, the friction speed pattern of described light source 101.Such as with reference to shown in Fig. 3 A, it illustrates in embodiment of the present invention, the schematic diagram of the Image Acquisition of described imageing sensor 103 and three kinds of velocity modes of described light source 101, and wherein often kind of velocity mode is all to having glow frequency.Such as, in present embodiment, suppose image sampling cycle=1/3000 second, light period=1/3000 of fast mode second, middle fast mode light period=1/1500 second, light period=1/1000 second of low-speed mode; Wherein said light period is the integral multiple in described image sampling cycle and is formed synchronous, that is during the Image Acquisition of described imageing sensor 103, described light source 101 provides light required when obtaining picture frame.By this, although described imageing sensor 103 obtains image with the fixing image sampling cycle, but all light when because described light source 101 is subject to the control of described light source control unit 102, not picture frame obtains, the light period that the effective image that therefore described imageing sensor 13 obtains is subject to described light source 101 controlled relatively at every turn; Wherein, described effective image is such as represented by solid arrow in figure (expression light source luminescent), and dotted arrow represents that light source is luminous and make imageing sensor 103 cannot get effective image (i.e. invalid image).Described processing unit 105 carries out the calculating of displacement and translational speed based on the effective image that described imageing sensor 103 obtains.Scrutable, image sampling cycle (sampling frequency) disclosed in Fig. 3 A, the numerical value of light period (glow frequency) are only exemplary, are not intended to limit the present invention.
With reference to shown in Fig. 3 A and 3B, then illustrate the maximum displacement that described processing unit 105 can detect between two effective images and maximum can detection speed.In a kind of embodiment, the relatively described light source 101 of described imageing sensor 103 light acquisition two effective images, such as the first image 20 and the second image 30.Described processing unit 105 is selected with reference to search box 21 at described first image 20, and selectes search box 31 in described second image 30.Described processing unit 105 then calculate described with reference to the distance between search box 21 and described search box 31 using the current displacement detected as institute's displacement sensing device 10.For the purpose of simplifying the description, only consider X-direction displacement (i.e. horizontal direction in figure) in Fig. 3 B, during practical operation, described displacement can comprise X-direction component and Y direction component.The maximum displacement that detects is positioned at reference to search box 21 situation that the leftmost side of described first image 20 and described search box 31 be positioned at described second image 30 rightmost side and calculates according to described and obtain.In this embodiment, suppose that often opening picture frame (i.e. the sensor array size of imageing sensor) has 16 × 16 pixels, described search box 31 and be describedly assumed to be 8 × 8 pixels with reference to search box 21, then maximum between continuous two effective images of described processing unit 105 detects displacement is 8 pixel distances (namely maximum detect number of pixels).Because the described maximum displacement that detects is determined by the size of often opening frame, thus do not affect by the glow frequency of described light source 101, that is described maximum to detect displacement all identical under the various velocity modes of described light source 101.
It can thus be appreciated that when the displacement of institute's displacement sensing device 10 between continuous two effective images is more than 8 pixel distances, described light source 101 must shorten light period, and described like this processing unit 105 can detect displacement; In other words, when the displacement of institute's displacement sensing device 10 exceed described maximum detect displacement time, described processing unit 105 cannot calculate described displacement, thus must shorten light period displacement sensing device 10 normal running to make of light source 101.Therefore, described processing unit 105 can control described light source 101 according to calculated displacement (such as aforementioned displacements amount) and enter friction speed pattern, such as fast mode, middle fast mode or low-speed mode.Scrutable, this explanation is enumerated all setting values and is only one embodiment of the present invention, is not intended to limit the present invention.
But, under friction speed pattern maximum can detection speed not identical.Such as, suppose that each Pixel Dimensions is 40 × 40 microns, then maximum under often kind of pattern detection speed=maximum can detect number of pixels × each Pixel Dimensions × frame per second.Therefore, the maximum of fast mode can detection speed=8 × 40 × 3000=37.8 inch per second (IPS); In like manner, middling speed and the maximum of low-speed mode can illustrate by detection speed in fig. 3 c, and wherein effectively frame per second is the inverse of the light period of described light source 101.
In order to reduce the power consumption of the light source 101 of displacement detector 10 further, the present invention and then make the number of times of lighting per second of light source in fast mode and middle fast mode be equal to low-speed mode, therefore the number of times of lighting per second that described light source 101 can be minimum is lighted, effectively to reduce power consumption.
Shown in Fig. 4 A, it illustrates the Image Acquisition of displacement detector 10 and the schematic diagram of light source igniting of embodiment of the present invention.First determine the velocity mode of described light source 101, described imageing sensor 103 obtains picture frame with fixing sampling frequency (such as 3000 per second), and described light source 101 is synchronized with described sampling frequency and lights continuously.The picture frame displacement calculating amount that described processing unit 105 obtains according to described imageing sensor 103, and determine velocity mode according to the comparative result of described displacement and at least one displacement threshold value, such as high speed, middling speed or low-speed mode.Then, described processing unit 105 notifies that described light source control unit 102 is luminous with different illumination mode with light source 101 described in described speed-mode control, such as correspond to N to open picture frame and light to make described imageing sensor 103 during described N opens picture frame, be obtained N continuously continuously and open effective image, then control described light source 101 to correspond to M and open picture frame and extinguish continuously, thus described imageing sensor 103 cannot obtain effective image during described M opens picture frame.Such as, in Fig. 4 A, I
1represent and correspond to the effective image that N opens picture frame, I
2represent and correspond to the invalid image that M opens picture frame; Such as, in Fig. 4 A, after light source 101 described in fast mode lights 4 continuously, then do not light for continuous 8; After described in middle fast mode, light source 101 lights 8 continuously, then do not light for continuous 4; Light source 101 described in low-speed mode item maintains fixing glow frequency and lights.Scrutable, the number lighting (N) and extinguishing (M) of light source 101 described in Fig. 4 A is only exemplary, is not intended to limit the present invention.
Described processing unit 105 according to effective image displacement calculating amount, such as, opens picture frame displacement calculating amount or average displacement amount according to described N, using described displacement as estimating displacement during described M opens picture frame.Preferably, the number of described N is more than or equal to 4, correctly can estimate described estimation displacement during M opens picture frame to make described processing unit 105.In a kind of embodiment, under low-speed mode, the numerical value of N is greater than the numerical value of N under fast mode, to increase system stability.In addition, because the length during M opens picture frame is subject to the restriction of the report rate of described transmission interface unit 106, therefore preferably lower than 8 milliseconds (when report rate is 125 times/second) during described M opens picture frame, or (M+N) to be preferably divided by the business of gained lower than frame per second (frame per second described herein is normal two inverses lighting the time interval continuously of described light source 101 under referring to velocity mode) and the described report rate of described light source 101, to avoid cannot correctly calculating described displacement; Such as when report rate is 125 times/second, under fast mode, (M+N) is preferably lower than 25, and under middle fast mode, (M+N) is preferably lower than 13, and wherein said numerical value is only exemplary.
With reference to shown in Fig. 4 B, by aforesaid operations method, the number of times of lighting per second of described light source 101 is 1000, and therefore under often kind of velocity mode, the power consumption stream of described light source 101 is all identical, and total power consumption stream to compare Fig. 3 A lower.In addition, sample according to original frame per second because described imageing sensor 103 remains during N opens picture frame, therefore maximumly still can remain identical with Fig. 3 C by detection speed.
The method of operating of the displacement detector of embodiment of the present invention comprises the following step: utilize imageing sensor to obtain picture frame with sampling frequency; Control light source light with at least one glow frequency or extinguish continuously; With utilize processing unit according to during described light source igniting obtain picture frame displacement calculating amount be used as described light source extinguish during estimate displacement.
Shown in Fig. 4 A and 5A, such as, in a kind of embodiment, the method for operating of displacement detector of the present invention can comprise the following step: utilize described imageing sensor 103 to obtain picture frame (step S with fixing sampling frequency
11); Control described light source 101 luminous with glow frequency, light continuously to open picture frame corresponding to N, make described imageing sensor 103 obtain N continuously and open effective image frame; Then open picture frame corresponding to M to extinguish continuously, to save power consumption (the step S of described light source 101 during described M opens picture frame
12); Open effective image frame displacement calculating amount with utilizing described processing unit 105 according to described N to be used as estimating displacement (step S during described M opens picture frame
13).In present embodiment, N is preferably greater than or equal to 4.Described method of operating also can comprise the following step: utilize described transmission interface unit 106 export described displacement with report rate and describedly estimate displacement, wherein (M+N) is less than or equal to the business of frame per second divided by described report rate gained of described light source 101, to avoid obtaining wrong displacement (step S
14); With utilize described processing unit 105 to open picture frame computed image quality according to described N, when described image quality increases the numerical value of N lower than during quality threshold value, to increase counting accuracy (step S
15).
The method of operating of the displacement detector of another embodiment of the present invention comprises the following step: utilize imageing sensor to obtain picture frame with sampling frequency; Light source synchronous is utilized to light continuously in described sampling frequency; Processing unit is utilized also to determine the velocity mode of described light source according to this according to the picture frame displacement calculating amount that described imageing sensor obtains; Control described light source light with described velocity mode or extinguish continuously; With utilize described processing unit according to during described light source igniting obtain picture frame displacement calculating amount be used as described light source extinguish during estimate displacement.
Shown in Fig. 4 A and 5B, such as, in a kind of embodiment, the light source 101 of institute's displacement sensing device has multiple velocity mode, and the method for operating of displacement detector of the present invention can comprise the following step: utilize described imageing sensor 103 to obtain picture frame (step S with fixing sampling frequency
21); Utilize described light source 101 to be synchronized with described sampling frequency and light (step S continuously
22); Described processing unit 105 is utilized also to determine velocity mode (the step S of described light source 101 according to this according to the picture frame displacement calculating amount that described imageing sensor 103 obtains
23); Control described light source 101 luminous with described velocity mode, light continuously to open picture frame corresponding to N, make described imageing sensor 103 obtain N continuously and open effective image frame; Then open picture frame corresponding to M to extinguish continuously, to save power consumption (the step S of described light source 101 during described M opens picture frame
24); Open effective image frame displacement calculating amount with utilizing described processing unit 105 according to described N to be used as estimating displacement (step S during described M opens picture frame
25).In this embodiment, described processing unit 105 also can switch described velocity mode according to described displacement immediately.In present embodiment, under low-speed mode, the numerical value of N is preferably greater than the numerical value of N under fast mode, to increase system stability.Similarly, N is preferably greater than or equal to 4, to increase the degree of accuracy calculating described displacement.Present embodiment also can comprise the following step: utilize described transmission interface unit 106 export described displacement with report rate and describedly estimate displacement, wherein (M+N) is less than or equal to the business of frame per second divided by described report rate gained of described light source 101, to avoid displacement (the step S obtaining mistake
26); With utilize described processing unit 105 to open picture frame computed image quality according to described N, and when described image quality increases the numerical value of N lower than during quality threshold value, to increase counting accuracy (step S
27).Should be noted that, step S
22middle light source 101 can be lighted with arbitrary speed mode continuous, such as, light 2-3 with minimum speed mode continuous and open or more than 3.In embodiment of the present invention, the picture frame be acquired when described effective image frame refers to that facing light sources is lighted.
In embodiment of the present invention, described light source 101 corresponds to N and opens after picture frame lights continuously, then corresponds to M and opens picture frame and extinguish continuously; The picture frame displacement calculating amount that described processing unit 105 obtains when lighting according to described light source 101, using described displacement as reference displacement, the displacement during described reference displacement can extinguish as described light source.
In sum, although known optical mouse saves power consumption by changing Image Acquisition frequency or light source frequency, the problem such as there is poor stability respectively and power consumption stream is fixing.The present invention also proposes a kind of displacement detector (Fig. 2 A and 2B) and method of operating (Fig. 5 A and 5B) thereof, and it all has identical power consumption stream under friction speed pattern, has preferred stability and can effectively reduce total consumption electric current.
Although the present invention is open with aforementioned embodiments, so it is not intended to limit the present invention, any the technical staff in the technical field of the invention, without departing from the spirit and scope of the present invention, can make various changes or modifications.What therefore protection scope of the present invention should define with appending claims is as the criterion.
Claims (22)
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| US10548490B2 (en) | 2012-03-01 | 2020-02-04 | Pixart Imaging Inc. | Physiological detection device and operating method thereof |
| US9658701B2 (en) * | 2014-01-27 | 2017-05-23 | Logitech Europe S.A. | Input device with hybrid tracking |
| CN107704107B (en) * | 2016-08-08 | 2020-12-08 | 原相科技股份有限公司 | Physiological detection device and operation method thereof |
| US11112884B1 (en) * | 2020-10-20 | 2021-09-07 | Pixart Imaging Inc. | Optical navigation scheme capable of saving more power based on variable frame rate as well as outputting enough displacement/position data to achieve precise motion tracking |
| CN115237267A (en) * | 2021-04-22 | 2022-10-25 | 义隆电子股份有限公司 | Optical mouse and control method thereof |
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| CN1477592A (en) * | 2002-07-30 | 2004-02-25 | 艾勒博科技股份有限公司 | Optical mouse and method for avoiding error action |
| KR100648517B1 (en) * | 2005-12-09 | 2006-11-27 | 주식회사 애트랩 | Optical navigation device and method of operation thereof |
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