CN104184952A - Optical detection device and synchronization adjustment method thereof - Google Patents
Optical detection device and synchronization adjustment method thereof Download PDFInfo
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- CN104184952A CN104184952A CN201310198599.XA CN201310198599A CN104184952A CN 104184952 A CN104184952 A CN 104184952A CN 201310198599 A CN201310198599 A CN 201310198599A CN 104184952 A CN104184952 A CN 104184952A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/76—Circuitry for compensating brightness variation in the scene by influencing the image signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/50—Control of the SSIS exposure
Abstract
The invention discloses a synchronization adjustment method for an optical detection device, and is used for enabling exposure frequency of an image sensor to be synchronized with flicker frequency of an indication light source. The method comprises the steps that continuous image sets are acquired, brightness values of all the images of the continuous image sets are analyzed, and exposure frequency is adjusted according to brightness ratio of two images and duty ratio of the image sensor. Exposure frequency of the image sensor is higher than flicker frequency of the indication light source. Frequency synchronization adjustment can be automatically performed by the optical detection device so that existence of a touch control pen with an active light-emitting function on a screen of an optical touch control system can be correctly judged by the optical detection device, and the position and the movement tracks of the touch control pen can be further rapidly calculated.
Description
Technical field
The present invention relates to a kind of optical detection apparatus, particularly about a kind of optical detection apparatus and synchronization adjustment method thereof of glow frequency of traceable active reference light source.
Background technology
In order to resist background light source noise, traditional optical detection apparatus can make the reference light source of the specific flicker frequency of apparatus conventionally, facilitates optical detection apparatus filtering noise.Because the flicker sequential of reference light source can change because the electric weight of its built-in power supply is not enough, in order to allow imageing sensor can correctly obtain the reference light source of described specific flicker frequency, whether synchronize according to the exposure time series of imageing sensor and the flicker sequential of reference light source, can be divided into two kinds of method for detecting of synchronous flashing and asynchronous flicker.Traditional synchronous flashing technology is first sent signal by optical detection apparatus, and after described signal is received by the sending and receiving end of reference light source, then basis signal time of reception adjusts the flicker sequential of reference light source, makes the exposure time series of its synchronous images transducer.But the method need, at reference light source signalization transceiver, have the shortcoming of cost costliness.
Summary of the invention
The invention provides a kind of optical detection apparatus and synchronization adjustment method thereof of glow frequency of traceable active reference light source, to solve the above problems.
The present invention discloses a kind of synchronization adjustment method of optical detection apparatus, is used for the frequency of exposure of imageing sensor to be synchronized with the flicker frequency of indicating light source.Described method comprises obtains consecutive image group, analyzes the brightness value of each image of described consecutive image group, and adjusts described frequency of exposure according to the duty ratio of the brightness ratio of two images and described imageing sensor.Wherein, the described frequency of exposure of described imageing sensor is higher than the described flicker frequency of described instruction light source.
The brightness value that the present invention also openly analyzes each image of described consecutive image group comprises and judges the complete bright image of described consecutive image group and the brightness ratio of adjacent non-complete bright image.
The brightness value that the present invention also openly analyzes each image of described consecutive image group comprises the brightness ratio of the relatively complete bright image of half bright image that judges described consecutive image group.
The present invention also openly adjusts described frequency of exposure and comprises the start-up time that changes described imageing sensor, so that described frequency of exposure is synchronized with described flicker frequency.
The present invention also discloses described method and further comprises when described consecutive image group has parts of images cannot get described instruction light source, downgrades the described frequency of exposure of described imageing sensor according to the default stage.
The present invention also discloses described method and further comprises that relatively the chronomere of another half bright image is poor according to one of them half bright image of described consecutive image group, obtain duty ratio or the flicker cycle of described instruction light source, and correspondingly adjust the described frequency of exposure of described imageing sensor according to described flicker cycle.
The present invention also discloses the regional area that described method further comprises the array of pixels of setting described imageing sensor, and adds up the brightness value of all pixels of described regional area.
The present invention also discloses total luminance value or the average brightness value that described brightness value is the partial pixel of each image.
The present invention also discloses brightness value and the threshold value that described method further comprises the partial pixel of more each image, and judges according to comparative result whether described imageing sensor reads described instruction light source.
When the present invention also discloses described method and is further included in described imageing sensor and reads described instruction light source, improve the described frequency of exposure of described imageing sensor, carry out the adjustment of synchronizeing of described frequency of exposure and described flicker frequency, and described frequency of exposure is synchronized with the described frequency of exposure that reduces described imageing sensor after described flicker frequency.
The present invention also discloses described method and further comprises and calculate the image number that does not read described instruction light source in described consecutive image group, and described image number while being greater than default value described in imageing sensor enter park mode.
The duty ratio that the present invention also discloses described imageing sensor is less than the duty ratio of described instruction light source.
The present invention also discloses a kind of synchronization adjustment method of optical detection apparatus, is used for the frequency of exposure of imageing sensor to be synchronized with the flicker frequency of indicating light source.Described method comprises according to the described frequency of exposure of the poor movement of preset phase, obtains multiple consecutive image groups, analyzes the brightness value of each image of each consecutive image group, and changes and adjust described imageing sensor according to the brightness of adjacent image.
The present invention also discloses described method and further comprises and find out the described consecutive image group with the complete dark adjacent complete bright image of image, and the described frequency of exposure of obtaining described consecutive image group is synchronized with the information of described flicker frequency.
The present invention also discloses a kind of optical detection apparatus, is used for detecting instruction light source.Described optical detection apparatus comprises imageing sensor and control unit.Described imageing sensor is used for obtaining consecutive image group.Described control unit is electrically connected described imageing sensor.Described control unit is analyzed the brightness value of each image of described consecutive image group, and recently adjusts the frequency of exposure of described imageing sensor according to the duty of the brightness ratio of two images and described imageing sensor.
The present invention can be according to the brightness value recognisable image transducer of the consecutive image obtaining and the phase difference of indicating light source, automatically carry out Frequency Synchronization adjustment for optical detection apparatus, optical detection apparatus can be correctly judged have the pointer of active lighting function whether to exist on the screen of optical touch control system, and further calculate fast position and the motion track of pointer.
Brief description of the drawings
Fig. 1 is the schematic diagram of the optical touch control system of the embodiment of the present invention.
Fig. 2 is the flow chart of the Frequency Synchronization method of adjustment of the embodiment of the present invention.
Fig. 3 A, Fig. 3 B are respectively the instruction light source of the embodiment of the present invention and the frequency comparison diagram of imageing sensor.
Fig. 4 is the flow chart of the frequency method for detecting of the embodiment of the present invention.
Fig. 5 is the operational flowchart of the optical detection apparatus of the embodiment of the present invention.
Fig. 6 is the flow chart of the Frequency Synchronization method of adjustment of another embodiment of the present invention.
Fig. 7 A, Fig. 7 B, Fig. 7 C are respectively the frequency comparison diagram of the instruction light source shown in Fig. 6 and imageing sensor.
Wherein, description of reference numerals is as follows:
10 optical touch control systems
12 optical detection apparatus
14 instruction light sources
16 imageing sensors
18 control units
Step 200,202,204
Step 400,402,404
Step 500,502,504,506,507,508,510,512,514
Step 600,602,604,606
Embodiment
Refer to Fig. 1, the schematic diagram of the optical touch control system 10 that Fig. 1 is the embodiment of the present invention.Optical touch control system 10 comprises optical detection apparatus 12 and instruction light source 14, and optical detection apparatus 12 is used for detecting and following the trail of light intensity and the motion track of the light signal of indicating light source 14, with the control command that judges that user is assigned by instruction light source 14.Wherein, instruction light source 14 is for having the pointer of active lighting function.Optical detection apparatus 12 comprises imageing sensor 16 and control unit 18.Imageing sensor 16 is arranged on the corner screen of optical touch control system 10, and towards screen surface to obtain consecutive image group.Screen can not arrange reflecting strips, or further coating can absorb the material of luminous energy, so that an evenly dark background to be provided.In the time that instruction light source 14 moves on screen, imageing sensor 16 just can detect the variation of corresponding light signal.
Control unit 18 electrical connection graph image-position sensors 16.Because duty ratio and the frequency of exposure of imageing sensor 16 are all known, but the flicker frequency of instruction light source 14 can reduce because of the electric power decay of the built-in battery of pointer, therefore optical detection apparatus 12 of the present invention can be analyzed in real time by control unit 18 brightness value of each image of consecutive image group, and recently adjust the frequency of exposure of imageing sensor 16 according to the duty of the brightness ratio of two images and imageing sensor 16, so that being adjusted to, the frequency of exposure of imageing sensor 16 is synchronized with the flicker frequency of indicating light source 14, guarantee that optical detection apparatus 12 can precisely judge the motion track of instruction light source 14.
In general, an optical detection apparatus 12 can comprise one or more imageing sensor 16 and a control unit 18, and optical touch control system 10 can have one or more optical detection apparatus 12, divides the Huo Ge border, each corner that is located at screen.When optical touch control system 10 has multiple optical detection apparatus 12, between multiple optical detection apparatus 12, can share a control unit 18, and shared control unit 18 can be independent of outside all optical detection apparatus 12, or be arranged on one of them optical detection apparatus 12 inside.In use, optical detection apparatus 12 starts all imageing sensors 16 with detecting instruction light source 14, and imageing sensor 16 is according to the location Calculation of obtaining image and carry out pointer.When imageing sensor 16 reads less than instruction light source 14, optical detection apparatus 12 enters park mode.In order to save energy resource consumption, the control unit 18 of park mode only starts one of them imageing sensor 16 detecting instruction light source 14, whether now imageing sensor 16 judges in image has pointer to have and do not position calculating, and carries out the synchronous adjustment of frequency according to the change in optical signal of indicating light source 14.
Furthermore, optical touch control system 10 has more than one imageing sensor 16 can have the first operator scheme and the second operator scheme, and the frequency of exposure of the first operator scheme is greater than the frequency of exposure of the second operator scheme.When general use state, control unit 18 is controlled multiple imageing sensors 16 and is operated in the second operator scheme, and the change in optical signal of detecting instruction light source 14 is also carried out location Calculation.When optical detection apparatus 12 enters park mode, control unit 18 is closed most of imageing sensors 16, only retain one of them imageing sensor 16, to save the energy resource consumption at park mode, and this imageing sensor 16 is switched to the first operator scheme carry out Frequency Synchronization adjustment.Because the frequency of exposure of the first operator scheme is far above the flicker frequency of instruction light source 14, make optical detection apparatus 12 can complete fast Frequency Synchronization, want the use habit of manipulation in real time to meet consumer.
Refer to Fig. 2 and Fig. 3, the flow chart of the Frequency Synchronization method of adjustment that Fig. 2 is the embodiment of the present invention, the instruction light source 14 that Fig. 3 is the embodiment of the present invention and the frequency comparison diagram of imageing sensor 16.Method described in Fig. 2 is useful in the optical detection apparatus 12 shown in Fig. 1.Because the flicker frequency of instruction light source 14 can comply with the stage of presetting with the electric power decay of the built-in battery of pointer and progressively downgrade, therefore optical detection apparatus 12 needs the frequency of exposure of detecting imageing sensor 16 whether to be synchronized with the flicker frequency of indicating light source 14, can adjust according to following step if do not reach synchronously.First, execution step 200, imageing sensor 16 obtains consecutive image group.Then perform step 202, control unit 18 judges the complete bright image of consecutive image group and the brightness ratio of adjacent non-complete bright image.Finally, execution step 204, control unit 18 changes the start-up time of imageing sensor 16 according to the brightness ratio of two images, so that the frequency of exposure of imageing sensor 16 is synchronized with the flicker frequency of indicating light source 14.
As shown in Figure 3, the frequency of exposure of imageing sensor 16 is higher than the flicker frequency of instruction light source 14, and the duty ratio of imageing sensor 16 is less than the duty ratio of indicating light source 14.In Fig. 3 A, consecutive image group comprises complete bright image and complete dark image, and therefore control unit 18 can obtain the information that frequency of exposure is synchronized with flicker frequency.For example, in the duty ratio (6T) of instruction light source 14, can produce three complete bright images.In Fig. 3 B, frequency of exposure and flicker frequency are not synchronous, and consecutive image group comprises complete bright image, half bright image and complete dark image.So control unit 18 can be chosen any half bright image, and obtain the brightness ratio of the relatively complete bright image of half bright image.For instance, if the brightness ratio of the relatively complete bright image of half bright image is 60%, brightness ratio is multiplied by the value of duty ratio (for example 1T) gained of imageing sensor 16, be the phase difference of frequency of exposure and flicker frequency, therefore control unit 18 can change according to the phase difference that calculates gained the start-up time of imageing sensor 16, makes frequency of exposure be synchronized with flicker frequency.
Also on the one hand, optical detection apparatus 12 of the present invention further can be applicable to the instruction light source 14 of unknown flicker frequency.Refer to Fig. 3 and Fig. 4, the flow chart of the frequency method for detecting that Fig. 4 is the embodiment of the present invention.Method described in Fig. 4 is useful in the optical detection apparatus 12 shown in Fig. 1.First, execution step 400, imageing sensor 16 obtains consecutive image group.Then perform step 402, one of them half bright image that control unit 18 the is analyzed consecutive image group relatively chronomere of another half bright image is poor, to obtain indicating duty ratio or the flicker cycle (inverse ratio of flicker frequency) of light source 14.For example, from Fig. 3 B, the chronomere of half bright image A and half bright image B is poor for indicating the duty ratio of light source 14, and the chronomere of half bright image A and half bright image C is poor is also the flicker cycle of instruction light source 14.Finally, execution step 404, control unit 18 can be according to the frequency of exposure of the corresponding adjustment imageing sensor 16 of the flicker frequency of detecting gained (calculated and learnt by flicker cycle), preferably making frequency of exposure is the integral multiple of flicker frequency, is convenient to carry out Frequency Synchronization adjustment as shown in Figure 2.
Other function in this for optical detection apparatus 12 of the present invention describes.Optical detection apparatus 12 is in the time carrying out Frequency Synchronization adjustment, and 18 of control units have judged whether that pointer (instruction light source 14) exists and do not position, and improves operation efficiency by this.First,, in the time of park mode, whether the brightness value summation of the partial pixel of control unit 18 more each images (for example predetermined number is one to three pixel) exceedes default threshold value.If not, pointer does not exist, and optical detection apparatus 12 maintains park mode; If so, represent that pointer is arranged in the sensing range of imageing sensor 16, imageing sensor 16 is switched to the first operator scheme by control unit 18, makes optical detection apparatus 12 jump out the go forward side by side synchronous adjustment of line frequency of park mode.In the first operator scheme, control unit 18 can be set imageing sensor 16 and utilize the regional area of array of pixels to carry out light signal detecting.For instance, control unit 18 can be according to imageing sensor 16 when the screen, and two pixel columns that approach screen surface are most made as regional area.Then, control unit 18 adds up the brightness value (for example total luminance value or average brightness value) of all pixels of regional area, meaning is that every image only has a brightness value, just can obtain the brightness ratio between each image in consecutive image group, uses for Frequency Synchronization adjustment.So, optical detection apparatus 12 can reduce energy resource consumption and improve the arithmetic speed of image processing.
Refer to Fig. 5, the operational flowchart of the optical detection apparatus 12 that Fig. 5 is the embodiment of the present invention.Mode of operation described in Fig. 5 is useful in the optical detection apparatus 12 shown in Fig. 1.First perform step 500, optical detection apparatus 12 initialization are to start imageing sensor 16.Then, execution step 502, control unit 18 judges whether imageing sensor 16 reads instruction light source 14.If so, perform step 504, control unit 18 improves the frequency of exposure of imageing sensor 16, and meaning switches imageing sensor 16 is the first operator scheme, scans acceleration synchronization adjustment by high frequency.Then perform step 506 with step 507, carry out the Frequency Synchronization adjustment as described in Fig. 2 or Fig. 3, control unit 18 needs to check the light signal phase place of instruction light source 14, and further confirms that the frequency of exposure of imageing sensor 16 has completed the synchronous adjustment of the flicker frequency of relative instruction light source 14.Finally, execution step 508, after the Frequency Synchronization of imageing sensor 16 and instruction light source 14, control unit 18 reduces the frequency of exposure of imageing sensor 16, and meaning is switched back the second operator scheme by imageing sensor 16.Then optical detection apparatus 12 just can also be carried out the location detecting of pointer (instruction light source 14); If do not detect the light signal of instruction light source 14,12 driving imageing sensors of optical detection apparatus 16 are searched instruction light source 14, and meaning performs step 502, to judge whether imageing sensor 16 reads instruction light source 14.
If control unit 18 judges imageing sensor 16 and does not read instruction light source 14, execution step 510, control unit 18 calculates the image number that does not get instruction light source 14 in consecutive image group.Be greater than default value if do not read the image number of light signal, for example multiple images are not all read instruction light source 14 continuously, execution step 512, control unit 18 judges that pointer (instruction light source 14) does not exist, and drives imageing sensor 16 to enter park mode.When imageing sensor 16 is from park mode is waken up, optical detection apparatus 12 can perform step 502, starts in real time the location detecting to pointer (instruction light source 14).Be less than default value if do not read the image number of light signal, consecutive image group only has parts of images cannot get instruction light source 14, and now control unit 18 can judge that the frequency of exposure of imageing sensor 16 does not have synchronously to indicate the flicker frequency of light source 14.Therefore execution step 514, control unit 18 downgrades the frequency of exposure of imageing sensor 16 according to the default stage, and again carries out the Frequency Synchronization adjustment of imageing sensor 16 and instruction light source 14 according to preceding method.
Refer to Fig. 6, the flow chart of the Frequency Synchronization method of adjustment that Fig. 6 is another embodiment of the present invention.Method described in Fig. 6 is useful in the optical detection apparatus 12 shown in Fig. 1.First, execution step 600, control unit 18 is according to the frequency of exposure of the poor moving image transmitting sensor 16 of preset phase, then perform step 602, imageing sensor 16 all obtains multiple consecutive image groups after each phase shift, then performs step 604, and control unit 18 is analyzed the brightness value of each image of each consecutive image group, with from multiple consecutive image groups, select and there is complete dark image one of them consecutive image group adjacent with complete bright image.So, the frequency of exposure that is selected consecutive image group described in control unit 18 can pick out is synchronized with the flicker frequency of indicating light source 14, therefore finally perform step 606, control unit 18 can change the frequency of exposure of adjusting imageing sensor 16 according to the brightness of adjacent image, synchronously to indicate the flicker frequency of light source 14.In this embodiment, the frequency of exposure of imageing sensor 16 preferably, higher than the flicker frequency of instruction light source 14, makes imageing sensor 16 to be scanned and to be completed fast Frequency Synchronization by high frequency.
Refer to Fig. 7, Fig. 7 is the instruction light source 14 shown in Fig. 6 and the frequency comparison diagram of imageing sensor 16.Specifically, control unit 18 can be poor according to preset phase, for example 1/3rd chronomeres, and the start-up time of change imageing sensor 16, to draw three kinds of waveform comparison diagrams as shown in Figure 7.In Fig. 7 A and Fig. 7 B, because the frequency of exposure of imageing sensor 16 does not have synchronously to indicate the flicker frequency of light source 14, therefore the consecutive image group that imageing sensor 16 obtains comprises complete bright image, half bright image and complete dark image, and half bright image interts between complete bright image and complete dark image.And in Fig. 7 C, synchronously indicate the flicker frequency of light source 14, the consecutive image group that imageing sensor 16 obtains because of the frequency of exposure of imageing sensor 16 and only include complete bright image and complete dark image.Control unit 18 can judge the corresponding frequency of exposure synchronous flashing frequency of the consecutive image group that only includes two adjacent complete bright images and complete dark image, therefore control unit 18 can drive imageing sensor to carry out image acquisition with synchronizing frequency according to aforementioned parameters (preset phase is poor).The duty ratio of imageing sensor 16 is preferably less than the duty ratio of indicating light source 14, makes the imageing sensor 16 can be at instruction light source 14 multiple images of quick obtaining when luminous.
As from the foregoing, the duty that optical detection apparatus of the present invention can be indicated light source in the unknown is the parameter of Auto-Sensing instruction light source under the condition of frequency of exposure when, or carry out fast the frequency of exposure of imageing sensor in the duty ratio of known instruction light source during with frequency of exposure and indicate light source frequency of exposure synchronize adjustment.Imageing sensor can be taken multiple consecutive image groups and carry out brightness ratio for control unit, indicates duty ratio and the exposure cycle of light source with judgement interval time of multiple half bright images.Duty ratio and frequency of exposure at instruction light source are all known situation, and optical detection apparatus can utilize a consecutive image group to complete the adjustment of Frequency Synchronization.Imageing sensor is taken a consecutive image group, and control unit is analyzed the brightness ratio of the interior half bright image of consecutive image group and complete bright image, to judge the phase difference of the frequency of exposure of imageing sensor and the frequency of exposure of instruction light source.So control unit just can change the start-up time of imageing sensor in real time, makes the Frequency Synchronization of imageing sensor and instruction light source.
Compare prior art, the present invention can be according to the brightness value recognisable image transducer of the consecutive image obtaining and the phase difference of indicating light source, automatically carry out Frequency Synchronization adjustment for optical detection apparatus, optical detection apparatus can be correctly judged have the pointer of active lighting function whether to exist on the screen of optical touch control system, and further calculate fast position and the motion track of pointer.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (29)
1. a synchronization adjustment method for optical detection apparatus, is used for the frequency of exposure of imageing sensor synchronously to indicate the flicker frequency of light source, it is characterized in that, described method comprises:
Obtain consecutive image group;
Analyze the brightness value of each image of described consecutive image group; And
Adjust described frequency of exposure according to the duty ratio of the brightness ratio of two images and described imageing sensor;
Wherein, the described frequency of exposure of described imageing sensor is higher than the described flicker frequency of described instruction light source.
2. the method for claim 1, is characterized in that, the brightness value of analyzing each image of described consecutive image group also comprises:
Judge the complete bright image of described consecutive image group and the brightness ratio of adjacent non-complete bright image.
3. the method for claim 1, is characterized in that, the brightness value of analyzing each image of described consecutive image group also comprises:
Judge the brightness ratio of the relatively complete bright image of half bright image of described consecutive image group.
4. the method for claim 1, is characterized in that, adjusts described frequency of exposure and also comprises:
Change the start-up time of described imageing sensor, so that the synchronous described flicker frequency of described frequency of exposure.
5. the method for claim 1, is characterized in that, described method further comprises:
When described consecutive image group has parts of images cannot get described instruction light source, downgrade the described frequency of exposure of described imageing sensor according to the default stage.
6. the method for claim 1, is characterized in that, described method further comprises:
According to one of them half bright image of described consecutive image group, relatively the chronomere of another half bright image is poor, obtains duty ratio or the flicker cycle of described instruction light source;
And
Correspondingly adjust the described frequency of exposure of described imageing sensor according to described flicker cycle.
7. the method for claim 1, is characterized in that, described method further comprises:
Set the regional area of the array of pixels of described imageing sensor; And
Add up the brightness value of all pixels of described regional area.
8. the method as described in claim 1 or 7, is characterized in that, the total luminance value of the partial pixel that described brightness value is each image or average brightness value.
9. the method for claim 1, is characterized in that, described method further comprises:
The brightness value of the partial pixel of more each image and threshold value; And
According to comparative result, judge whether described imageing sensor reads described instruction light source.
10. method as claimed in claim 9, is characterized in that, described method further comprises:
In the time that described imageing sensor reads described instruction light source, improve the described frequency of exposure of described imageing sensor;
Carry out the adjustment of synchronizeing of described frequency of exposure and described flicker frequency; And
After the synchronous described flicker frequency of described frequency of exposure, reduce the described frequency of exposure of described imageing sensor.
11. methods as claimed in claim 9, is characterized in that, described method further comprises:
Calculate the image number that does not read described instruction light source in described consecutive image group; And
When described image number is greater than default value, described imageing sensor enters park mode.
12. the method for claim 1, is characterized in that, the duty ratio of described imageing sensor is less than the duty ratio of described instruction light source.
The synchronization adjustment method of 13. 1 kinds of optical detection apparatus, is used for the frequency of exposure of imageing sensor synchronously to indicate the flicker frequency of light source, it is characterized in that, described method comprises:
According to the described frequency of exposure of the poor movement of preset phase;
Obtain multiple consecutive image groups;
Analyze the brightness value of each image of each consecutive image group; And
Change and adjust described imageing sensor according to the brightness of adjacent image.
14. methods as claimed in claim 13, is characterized in that, described method further comprises:
Find out the described consecutive image group with the complete dark adjacent complete bright image of image; And
Obtain the information of the synchronous described flicker frequency of described frequency of exposure of described consecutive image group.
15. methods as claimed in claim 13, is characterized in that, the duty ratio of described imageing sensor is less than or equal to the duty ratio of described instruction light source.
16. 1 kinds of optical detection apparatus, are used for detecting instruction light source, it is characterized in that, described optical detection apparatus comprises:
Imageing sensor, is used for obtaining consecutive image group; And
Control unit, is electrically connected described imageing sensor, and described control unit is analyzed the brightness value of each image of described consecutive image group, and recently adjusts the frequency of exposure of described imageing sensor according to the duty of the brightness ratio of two images and described imageing sensor;
Wherein, the described frequency of exposure of described imageing sensor is higher than the flicker frequency of described instruction light source.
17. optical detection apparatus as claimed in claim 16, is characterized in that, described control unit judges the complete bright image of described consecutive image group and adjacent non-complete bright image, or the brightness ratio of the relatively complete bright image of half bright image.
18. optical detection apparatus as claimed in claim 16, is characterized in that, described control unit changes the start-up time of described imageing sensor, so that the synchronous described flicker frequency of described frequency of exposure.
19. optical detection apparatus as claimed in claim 16, is characterized in that, described control unit further, in the time that described imageing sensor has parts of images cannot get described instruction light source, downgrades the described frequency of exposure of described imageing sensor according to the default stage.
20. optical detection apparatus as claimed in claim 16, it is characterized in that, described control unit is further poor according to the chronomere of relative another the half bright image of one of them half bright image of described consecutive image group, obtain duty ratio or the flicker cycle of described instruction light source, with the described frequency of exposure of the described imageing sensor of corresponding adjustment.
21. optical detection apparatus as claimed in claim 16, it is characterized in that, described control unit is further set the regional area of the array of pixels of described imageing sensor, and adds up the brightness value of all pixels of described regional area, to obtain total luminance value or the average brightness value of each image.
22. optical detection apparatus as claimed in claim 16, is characterized in that, described control unit is brightness value and the threshold value of the partial pixel of more each image further, to judge whether described imageing sensor reads described instruction light source.
23. optical detection apparatus as claimed in claim 22, is characterized in that, when described imageing sensor reads described instruction light source, described control unit improves described frequency of exposure with synchronous described flicker frequency, and after Frequency Synchronization, reduces described frequency of exposure.
24. optical detection apparatus as claimed in claim 22, is characterized in that, described control unit calculates and do not read the image number of described instruction light source, and drives described imageing sensor to enter park mode in the time that described image number is greater than default value.
25. optical detection apparatus as claimed in claim 16, it is characterized in that, described imageing sensor has first, second operator scheme, the frequency of exposure of described the first operator scheme is greater than the frequency of exposure of described the second operator scheme, described in described control unit control, imageing sensor operates in described the first operator scheme synchronously to adjust, and after Frequency Synchronization, controls described imageing sensor and operate in described the second operator scheme.
26. optical detection apparatus as claimed in claim 16, it is characterized in that, described optical detection apparatus further comprises multiple imageing sensors, described control unit starts one of them imageing sensor at described park mode and carries out Frequency Synchronization adjustment, and starts described multiple imageing sensor to detect described instruction light source leaving after park mode.
27. optical detection apparatus as claimed in claim 16, it is characterized in that, described control unit further according to the described frequency of exposure of the described imageing sensor of the poor movement of preset phase to obtain respectively multiple consecutive image groups, and analyze the brightness value of each image of each consecutive image group, to change and to adjust described imageing sensor according to the brightness of adjacent image.
28. optical detection apparatus as claimed in claim 27, it is characterized in that, described control unit is further found out the described consecutive image group with the complete dark adjacent complete bright image of image, and the described frequency of exposure of obtaining described consecutive image group is synchronized with the information of described flicker frequency.
29. optical detection apparatus as claimed in claim 16, is characterized in that, the duty ratio of described imageing sensor is less than or equal to the duty ratio of described instruction light source.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310198599.XA CN104184952B (en) | 2013-05-24 | 2013-05-24 | Optical detection apparatus and its synchronization adjustment method |
| CN201710334402.9A CN107181919B (en) | 2013-05-24 | 2013-05-24 | Optical detection apparatus |
| CN201710331467.8A CN107277383B (en) | 2013-05-24 | 2013-05-24 | Optical detection apparatus and its synchronization adjustment method |
Applications Claiming Priority (1)
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Cited By (3)
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| CN105915807A (en) * | 2015-02-20 | 2016-08-31 | 佳能株式会社 | Image Pickup Apparatus That Calculates Light Amount Change Characteristic, Electronic Apparatus, And Method Of Calculating Light Amount Change Characteristic |
| CN106131461A (en) * | 2016-06-28 | 2016-11-16 | 湖北久之洋红外系统股份有限公司 | A kind of multiple image sensor synchronous control system and image processing module |
| WO2021179282A1 (en) * | 2020-03-13 | 2021-09-16 | 深圳市大疆创新科技有限公司 | Method, system, and device for controlling movable platform, and movable platform |
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| CN107181919B (en) * | 2013-05-24 | 2019-10-29 | 原相科技股份有限公司 | Optical detection apparatus |
| US11171584B1 (en) * | 2020-05-11 | 2021-11-09 | Pix Art Imaging Inc. | Interpolation circuit and motor driving circuit |
| US11245845B2 (en) * | 2020-06-04 | 2022-02-08 | Hand Held Products, Inc. | Systems and methods for operating an imaging device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107181919A (en) | 2017-09-19 |
| CN107181919B (en) | 2019-10-29 |
| CN107277383A (en) | 2017-10-20 |
| CN107277383B (en) | 2019-10-29 |
| CN104184952B (en) | 2018-02-02 |
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