CN109151255B - Camera flicker elimination method and device based on photoelectric detection - Google Patents
Camera flicker elimination method and device based on photoelectric detection Download PDFInfo
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Abstract
The invention provides a method and a device for eliminating camera flicker based on photoelectric detection, wherein the method comprises the following steps: s1, sampling the ambient light signal; s2, determining the flicker frequency of the ambient light; and S3, updating the camera frame rate. The invention realizes the interference suppression of the light interference of various flicker frequencies and the light superposed by various flicker frequencies, keeps the video image stable and improves the image quality.
Description
Technical Field
The invention relates to the technical field of image processing, in particular to a camera flicker elimination method and device based on photoelectric detection.
Background
Cameras are increasingly used in automobiles, such as a back-up rearview device, a 360-degree panoramic looking device, a streaming media inside rearview mirror, a streaming media outside rearview mirror, a driving recorder and the like. The development of the automobile automatic driving technology has higher and higher requirements on the anti-interference of the camera. The crossroad of urban road is covered with red street lamp, traffic monitoring lamp, and when the car stops or slowly goes through at the crossroad, the scintillation of its light can cause the interference to the camera formation of image, leads to the video ripple form to disturb, and then leads to the camera performance reduction.
The current interference suppression scheme of the camera is only effective on 50Hz alternating current lamplight, but the urban street lamp generally uses LED lamps and xenon lamps, the working frequency is different between 100 Hz and 200Hz, and therefore the camera is difficult to filter out the interference.
Therefore, the prior art is in need of further improvement.
Disclosure of Invention
The invention provides a camera flicker elimination method and device based on photoelectric detection, and aims to overcome the defects in the prior art, realize interference suppression on lamplight interference of various flicker frequencies and lamplight superposed by various flicker frequencies, keep video images stable, and improve image quality.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a camera flicker elimination method based on photoelectric detection, which comprises the following steps:
s1, sampling the ambient light signal;
s2, determining the flicker frequency of the ambient light;
and S3, updating the camera frame rate.
Specifically, the step of sampling the ambient light signal includes:
s101, converting an ambient light signal into a corresponding brightness electric signal;
s102, amplifying and filtering the brightness electric signal;
and S103, sampling and storing the brightness electric signal.
Specifically, the step of determining the ambient light flicker frequency specifically includes:
s201, comparing each brightness value in the brightness array with a brightness mean value respectively, if the brightness value is greater than the brightness mean value, the corresponding mark value is 1, otherwise, the corresponding mark value is 0, and sequentially storing the mark values in the mark value array;
s202, recording the number of continuous same mark values as peak-valley counting, and sequentially storing the peak-valley counting in a counting array;
and S203, calculating the flicker frequency of the ambient light according to the sampling frequency and the peak-valley count.
Specifically, the step of calculating the ambient light flicker frequency according to the sampling frequency and the peak-to-valley count includes:
s2031, determining the number of peak-valley counts;
s2032, calculating each initial flicker frequency of the ambient light;
s2033, calculating an arithmetic mean value according to the initial flicker frequency of the ambient light to obtain the flicker frequency of the ambient light.
Specifically, each initial flicker frequency Mi of the ambient light is C/(J (2i) + J (2i +1)), where C denotes a sampling frequency, i is 1,2, … n (n is [ (k-2)/2], k denotes the number of peak-valley counts, [ ] denotes an integer, [ ]), (J (2i) denotes a 2 i-th peak-valley count, and J (2i +1) denotes a 2i + 1-th peak-valley count.
Specifically, the ambient light flicker frequency M ═ M1+ M2+ … + Mn)/n, where n ═ [ (k-2)/2], k represents the number of peak-to-valley counts, [ ] represents taking an integer.
Specifically, the step of updating the camera frame rate specifically includes:
s301, determining an undetermined frame rate of the camera according to the ambient light flicker frequency and the initial frame rate of the camera;
s302, determining the camera frame rate according to the undetermined frame rate of the camera.
Specifically, the step of determining the undetermined frame rate of the camera according to the ambient light flicker frequency and the initial frame rate of the camera includes:
if the ambient light flicker frequency is larger than or equal to the initial frame rate of the camera, determining an undetermined frame rate p '═ M/Q of the camera, wherein M represents the ambient light flicker frequency, [ M ] represents an integer value of M, Q is an integer of 1-10, and p' is an integer value within 15-120 fps;
and if the ambient light flicker frequency is less than or equal to the initial frame rate of the camera, determining an undetermined frame rate p '═ M (Q) of the camera, wherein M represents the ambient light flicker frequency, [ M ] represents an integer value of M, Q is an integer of 1-10, and p' is an integer value within 15-120 fps.
Specifically, the step of determining the frame rate of the camera according to the undetermined frame rate of the camera includes: and determining the minimum absolute value of the difference value between the undetermined frame rate of the camera and the initial frame rate of the camera as the frame rate of the camera.
Further, after the step S1 and before the step S2, the method further includes:
and S11, judging the ambient light flicker threshold.
Specifically, the step of determining the ambient light flicker threshold includes: and judging whether the brightness mean value in the brightness array exceeds a preset brightness threshold value, if so, returning to the step of sampling the ambient light signal, otherwise, further judging whether the difference value between the maximum value and the minimum value of the brightness value in the brightness array and the brightness mean value exceeds a preset fluctuation threshold value, if so, determining the ambient light flicker frequency, otherwise, returning to the step of sampling the ambient light signal.
In another aspect, the present invention provides a camera flicker elimination apparatus based on photoelectric detection, including: the device comprises a camera sensor module, a photoelectric conversion module, an amplification filtering module, a sampling module, a storage module, a flicker frequency determination module, a camera frame rate determination module and a communication module;
the photoelectric conversion module, the amplification and filtering module, the sampling module, the flicker frequency determining module, the camera frame rate determining module, the communication module and the camera sensor module are sequentially connected; the storage module is connected with the sampling module and the flicker frequency determination module.
The photoelectric conversion module is used for converting the ambient light into a corresponding brightness signal;
the amplifying and filtering module is used for amplifying and filtering the brightness signal;
the sampling module is used for sampling the brightness signal;
the storage module is used for storing the brightness value obtained by sampling;
the flicker frequency determining module is used for determining the flicker frequency of the ambient light;
the camera frame rate determining module is used for determining a frame rate for inhibiting the camera from flickering according to the ambient light flickering frequency;
the communication module is used for communicating with the camera sensor module;
the camera sensor module is used for acquiring images according to the frame rate determined by the camera frame rate determining module;
the flicker frequency determining module determines the flicker frequency according to the following method:
s201, comparing each brightness value in the brightness array with a brightness mean value respectively, if the brightness value is greater than the brightness mean value, the corresponding mark value is 1, otherwise, the corresponding mark value is 0, and sequentially storing the mark values in the mark value array;
s202, recording the number of continuous same mark values as peak-valley counting, and sequentially storing the peak-valley counting in a counting array;
and S203, calculating the flicker frequency of the ambient light according to the sampling frequency and the peak-valley count.
Further, the camera flicker elimination device based on photoelectric detection further comprises a flicker determination module, which is connected with the storage module and the flicker frequency determination module and is used for determining whether the ambient light flickers.
The invention has the beneficial effects that: the invention obtains the brightness electric signal by carrying out photoelectric conversion on the ambient light, samples and stores the brightness electric signal, thereby determining the flicker frequency of the ambient light, realizing the interference suppression on the light interference of various flicker frequencies and the light superposed by various flicker frequencies, keeping the stability of the video image and improving the image quality.
Drawings
FIG. 1 is a schematic flow chart of a method for eliminating flicker of a camera based on photoelectric detection according to the present invention;
FIG. 2 is a numerical diagram of the present invention for calculating the ambient light flicker frequency;
FIG. 3 is a schematic structural diagram of a camera flicker elimination apparatus based on photoelectric detection according to the present invention;
fig. 4 is another schematic structural diagram of the camera flicker elimination device based on photoelectric detection according to the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are for reference and illustrative purposes only and are not intended to limit the scope of the invention.
As shown in fig. 1, in one aspect, an embodiment of the present invention provides a method for eliminating camera flicker based on photodetection, including:
The step of sampling the ambient light signal comprises:
step 101, converting the ambient light signal into a corresponding luminance electrical signal.
In one practical example, the ambient light signal (including the flicker signal and other visible light signals) can be converted into the luminance electrical signal by the photoelectric converter.
And 102, amplifying and filtering the brightness electric signal.
The brightness electric signal output by the photoelectric converter is subjected to capacitive coupling to filter out direct current components, is input to an amplifier for amplification, is subjected to low-pass filter (the cut-off frequency is set to be 250Hz) to filter out other high-frequency interference signals (the flicker frequency of a traffic light and an LED light is between 10Hz and 200 Hz), and is input to an A/D interface of an MCU (Micro Controller Unit).
And 103, sampling and storing the brightness electric signal.
Since the maximum frequency of the light flicker is 250Hz, and the minimum sampling frequency C of the MCU a/D is 500Hz according to shannon's theorem, in order to improve the accuracy, in this embodiment, the sampling frequency C of the MCU a/D is set to 2kHz, and the sampled luminance value is stored in the luminance array.
And 2, determining the flicker frequency of the ambient light.
The flicker-free ambient light is stable for a sufficiently short time, and the brightness value of the ambient light with the flicker phenomenon fluctuates. By comparing with the brightness mean value, it is judged that the peak of flicker is higher than the brightness mean value and the valley of flicker is lower than the brightness mean value.
The step of determining the ambient light flicker frequency specifically comprises:
step 201, comparing each brightness value in the brightness array with the brightness mean value, if the brightness value is greater than the brightness mean value, the corresponding flag value is 1, otherwise, the corresponding flag value is 0, and storing the flag values in the flag value array in sequence.
Step 202, recording the number of the continuous same mark values as peak-valley counts, and sequentially storing the peak-valley counts in a count array.
For example, if the 1 st peak-to-valley count indicates 3 consecutive flag values of 1, the peak-to-valley count J (1) is 3; the 2 nd peak-to-valley count indicates 28 consecutive flag values of 0, and the peak-to-valley count J (2) is 28; if the 3 rd count indicates 16 consecutive flag values 1, the peak-to-valley count J (3) is 16; and so on.
And step 203, calculating the flicker frequency of the ambient light according to the sampling frequency and the peak-valley count.
Since the first peak-to-valley count and the last peak-to-valley count may not be values obtained over a complete cycle, to reduce error, the peak-to-valley count in calculating the ambient light flicker frequency is selected to begin with the second peak-to-valley count of the count array and end with the penultimate peak-to-valley count.
The specific calculation steps include:
step 2031, determine the number k of peak-to-valley counts.
Step 2032, calculating each initial flicker frequency of the ambient light.
Specifically, each initial flicker frequency Mi of the ambient light is C/(J (2i) + J (2i +1)), where C denotes a sampling frequency, i is 1,2, … n (n is [ (k-2)/2], [ ] denotes an integer), (J (2i) denotes a 2 i-th peak-to-valley count, and J (2i +1) denotes a 2i + 1-th peak-to-valley count.
Step 2033, obtaining an arithmetic mean value according to the initial flicker frequency of the ambient light to obtain the flicker frequency of the ambient light.
Specifically, the ambient light flicker frequency M ═ (M1+ M2+ … + Mn)/n.
For example, as shown in fig. 2, is an example of calculating the ambient light flicker frequency according to the present invention.
In this example, the sampling frequency C is 2000 Hz.
Array A represents the luminance array, array B represents the flag value array, and array C represents the count array.
The peak-valley count J (i) is, in order, J (1) 3, J (2) 28, J (3) 16, J (4) 26, J (5) 19, J (6) 1, the number of peak-valley counts k 6, and n [ (k-2)/2] 2.
Thus, each initial flicker frequency m (i) of the ambient light is:
M1＝C/(J(2)+J(3))＝2000Hz/(28+16)＝45.45Hz；
M2＝C/(J(4)+J(5))＝2000Hz/(26+19)＝44.44Hz。
therefore, the ambient light flicker frequency M is (M1+ M2)/2 is (45.45+44.44)/2 is 44.92 (Hz).
And step 3, updating the frame rate of the camera.
The step of updating the camera frame rate specifically includes:
step 301, determining an undetermined frame rate of the camera according to the ambient light flicker frequency and the initial frame rate of the camera.
The method specifically comprises the following steps:
if the ambient light flicker frequency M is larger than or equal to the initial camera frame rate p0, determining the undetermined camera frame rate p '═ M/Q, wherein [ M ] represents an integer value of M, Q is an integer of 1-10, and p' is an integer value within 15-120 fps;
and if the ambient light flicker frequency M is less than or equal to the initial camera frame rate p0, determining an undetermined camera frame rate p '═ M ] Q, wherein [ M ] represents an integer value of M, Q is an integer of 1-10, and p' is an integer value within 15-120 fps.
For example, if the ambient light flicker frequency M is 44.92Hz, and 44Hz after rounding, the initial camera frame rate p0 is 30 fps:
since M > p0, the pending frame rate p' ═ M ]/Q ═ {44, 22 }.
And 302, determining a camera frame rate according to the undetermined frame rate of the camera.
The method specifically comprises the following steps: and determining the minimum absolute value of the difference value between the undetermined frame rate of the camera and the initial frame rate of the camera as the frame rate of the camera.
For example, in the camera pending frame rate p' ═ {44, 22}, the absolute value of the difference between 22 and the camera initial frame rate p0(30fps) is the smallest, and therefore, the camera frame rate p is finally determined to be 22 fps.
In another embodiment of the present invention, to further improve the accuracy of the determination, after step 1 and before step 2, the method further includes:
and step 11, judging an ambient light flicker threshold value.
The step of ambient light flicker threshold determination comprises: and judging whether the brightness mean value in the brightness array exceeds a preset brightness threshold value, if so, returning to the step of sampling the ambient light signal, otherwise, further judging whether the difference value between the maximum value and the minimum value of the brightness value in the brightness array and the brightness mean value exceeds a preset fluctuation threshold value, if so, determining the ambient light flicker frequency, otherwise, returning to the step of sampling the ambient light signal.
The preset brightness threshold and the preset fluctuation threshold may be calibrated according to actual effects, for example, the preset brightness threshold may be set to 15000lux, and the preset fluctuation threshold may be set to 20%.
As shown in fig. 3, another aspect of the present invention provides a camera flicker elimination apparatus based on photodetection, including: the device comprises a camera sensor module, a photoelectric conversion module, an amplification filtering module, a sampling module, a storage module, a flicker frequency determination module, a camera frame rate determination module and a communication module;
the photoelectric conversion module, the amplification and filtering module, the sampling module, the flicker frequency determining module, the camera frame rate determining module, the communication module and the camera sensor module are sequentially connected; the storage module is connected with the sampling module and the flicker frequency determination module.
The photoelectric conversion module is used for converting the ambient light into a corresponding brightness signal;
the amplifying and filtering module is used for amplifying and filtering the brightness signal;
the sampling module is used for sampling the brightness signal;
the storage module is used for storing the brightness value obtained by sampling;
the flicker frequency determining module is used for determining the flicker frequency of the ambient light;
the camera frame rate determining module is used for determining a frame rate for inhibiting the camera from flickering according to the ambient light flickering frequency;
the communication module is used for communicating with the camera sensor module;
the camera sensor module is used for acquiring images according to the frame rate determined by the camera frame rate determining module.
The amplifying and filtering module can be integrated into one module, and can also be divided into an amplifying module and a filtering module; the photoelectric conversion module and the amplifying and filtering module can be integrated with the camera sensor module in the same camera, and can also be separated from the camera sensor module.
The working process of the device is as described above, and is not described herein again.
As shown in fig. 4, in another example of the present invention, the apparatus further includes a flicker determining module, connected to the storage module and the flicker frequency determining module, for determining whether the ambient light flickers.
By adding the flicker determination module, the accuracy of the device can be further improved.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention.
Claims (4)
1. A camera flicker elimination method based on photoelectric detection is characterized by comprising the following steps:
s1, sampling the ambient light signal;
s2, determining the flicker frequency of the ambient light;
s3, updating the camera frame rate;
the step of sampling the ambient light signal comprises:
s101, converting an ambient light signal into a corresponding brightness electric signal;
s102, amplifying and filtering the brightness electric signal;
s103, sampling and storing the brightness electric signal;
the step of determining the ambient light flicker frequency comprises:
s201, comparing each brightness value in the brightness array with a brightness mean value respectively, if the brightness value is greater than the brightness mean value, the corresponding mark value is 1, otherwise, the corresponding mark value is 0, and sequentially storing the mark values in the mark value array;
s202, recording the number of continuous same mark values as peak-valley counting, and sequentially storing the peak-valley counting in a counting array;
s203, calculating the ambient light flicker frequency according to the sampling frequency and the peak-valley count, and comprising the following steps:
s2031, determining the number of peak-valley counts;
s2032, calculating each initial flicker frequency of the ambient light, including:
each initial flicker frequency Mi = C/(J (2i) + J (2i +1)), where C denotes a sampling frequency, i =1,2, … n, n = [ (k-2)/2], k denotes the number of peak-valley counts, [ ] denotes an integer, J (2i) denotes a 2 i-th peak-valley count, and J (2i +1) denotes a 2i + 1-th peak-valley count;
s2033, obtaining an arithmetic mean value according to each initial flicker frequency of the ambient light to obtain the flicker frequency of the ambient light, and the method comprises the following steps:
the ambient light flicker frequency M = (M1+ M2+ … + Mn)/n, wherein n = [ (k-2)/2], k represents the number of peak-valley counts, and [ ] represents taking an integer;
the step of updating the camera frame rate specifically includes:
s301, determining the undetermined frame rate of the camera according to the ambient light flicker frequency and the initial frame rate of the camera, and the method comprises the following steps:
if the ambient light flicker frequency is larger than or equal to the initial frame rate of the camera, determining a undetermined frame rate p '= [ M ]/Q of the camera, wherein M represents the ambient light flicker frequency, [ M ] represents an integer value of M, Q is an integer of 1-10, and p' is an integer value within 15-120 fps;
if the ambient light flicker frequency is not greater than the initial frame rate of the camera, determining a undetermined frame rate p '= [ M ]. Q of the camera, wherein M represents the ambient light flicker frequency, [ M ] represents an integer value of M, Q is an integer of 1-10, and p' is an integer value within 15-120 fps;
s302, determining the camera frame rate according to the undetermined frame rate of the camera, and the method comprises the following steps: and determining the minimum absolute value of the difference value between the undetermined frame rate of the camera and the initial frame rate of the camera as the frame rate of the camera.
2. The method for eliminating flicker of a camera based on photoelectric detection as claimed in claim 1, further comprising, after the step S1 and before the step S2:
s11, the step of determining the ambient light flicker threshold includes:
and judging whether the brightness mean value in the brightness array exceeds a preset brightness threshold value, if so, returning to the step of sampling the ambient light signal, otherwise, further judging whether the difference value between the maximum value and the minimum value of the brightness value in the brightness array and the brightness mean value exceeds a preset fluctuation threshold value, if so, determining the ambient light flicker frequency, otherwise, returning to the step of sampling the ambient light signal.
3. A camera flicker elimination apparatus based on photodetection, comprising: the device comprises a camera sensor module, a photoelectric conversion module, an amplification filtering module, a sampling module, a storage module, a flicker frequency determination module, a camera frame rate determination module and a communication module;
the photoelectric conversion module, the amplification and filtering module, the sampling module, the flicker frequency determining module, the camera frame rate determining module, the communication module and the camera sensor module are sequentially connected; the storage module is connected with the sampling module and the flicker frequency determination module;
the photoelectric conversion module is used for converting the ambient light into a corresponding brightness signal;
the amplifying and filtering module is used for amplifying and filtering the brightness signal;
the sampling module is used for sampling the brightness signal;
the storage module is used for storing the brightness value obtained by sampling;
the flicker frequency determining module is used for determining the flicker frequency of the ambient light;
the camera frame rate determining module is used for determining a frame rate for inhibiting the camera from flickering according to the ambient light flickering frequency;
the communication module is used for communicating with the camera sensor module;
the camera sensor module is used for acquiring images according to the frame rate determined by the camera frame rate determining module;
the flicker frequency determining module determines the flicker frequency according to the following method:
s201, comparing each brightness value in the brightness array with a brightness mean value respectively, if the brightness value is greater than the brightness mean value, the corresponding mark value is 1, otherwise, the corresponding mark value is 0, and sequentially storing the mark values in the mark value array;
s202, recording the number of continuous same mark values as peak-valley counting, and sequentially storing the peak-valley counting in a counting array;
s203, calculating the ambient light flicker frequency according to the sampling frequency and the peak-valley count, and comprising the following steps:
s2031, determining the number of peak-valley counts;
s2032, calculating each initial flicker frequency of the ambient light, including:
each initial flicker frequency Mi = C/(J (2i) + J (2i +1)), where C denotes a sampling frequency, i =1,2, … n, n = [ (k-2)/2], k denotes the number of peak-valley counts, [ ] denotes an integer, J (2i) denotes a 2 i-th peak-valley count, and J (2i +1) denotes a 2i + 1-th peak-valley count;
s2033, obtaining an arithmetic mean value according to each initial flicker frequency of the ambient light to obtain the flicker frequency of the ambient light, and the method comprises the following steps:
the ambient light flicker frequency M = (M1+ M2+ … + Mn)/n, wherein n = [ (k-2)/2], k represents the number of peak-valley counts, and [ ] represents taking an integer;
the camera frame rate determining module determines the frame rate for inhibiting the camera flicker according to the following method:
s301, determining the undetermined frame rate of the camera according to the ambient light flicker frequency and the initial frame rate of the camera, and the method comprises the following steps:
if the ambient light flicker frequency is larger than or equal to the initial frame rate of the camera, determining a undetermined frame rate p '= [ M ]/Q of the camera, wherein M represents the ambient light flicker frequency, [ M ] represents an integer value of M, Q is an integer of 1-10, and p' is an integer value within 15-120 fps;
if the ambient light flicker frequency is not greater than the initial frame rate of the camera, determining a undetermined frame rate p '= [ M ]. Q of the camera, wherein M represents the ambient light flicker frequency, [ M ] represents an integer value of M, Q is an integer of 1-10, and p' is an integer value within 15-120 fps;
s302, determining the camera frame rate according to the undetermined frame rate of the camera, and the method comprises the following steps: and determining the minimum absolute value of the difference value between the undetermined frame rate of the camera and the initial frame rate of the camera as the frame rate of the camera.
4. The camera flicker elimination apparatus based on photoelectric detection as claimed in claim 3, further comprising a flicker determination module, connected to the storage module and the flicker frequency determination module, for determining whether the ambient light flickers.
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| CN111355864B (en) * | 2020-04-16 | 2022-06-14 | 浙江大华技术股份有限公司 | Image flicker elimination method and device |
| CN113660428B (en) * | 2020-04-30 | 2023-07-04 | 北京小米移动软件有限公司 | Image acquisition method and device and electronic equipment |
| CN111741226B (en) * | 2020-06-18 | 2021-11-23 | 杭州海康汽车软件有限公司 | Method and device for controlling camera and warning lamp and vehicle |
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