CN113422902A - Camera frame rate adjusting method - Google Patents
Camera frame rate adjusting method Download PDFInfo
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- CN113422902A CN113422902A CN202110602969.6A CN202110602969A CN113422902A CN 113422902 A CN113422902 A CN 113422902A CN 202110602969 A CN202110602969 A CN 202110602969A CN 113422902 A CN113422902 A CN 113422902A
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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
- H04N23/67—Focus control based on electronic image sensor signals
- H04N23/676—Bracketing for image capture at varying focusing conditions
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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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- Controls And Circuits For Display Device (AREA)
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Abstract
The invention provides a camera frame rate adjusting method, which comprises the following steps: step 100, calculating a first frame rate according to an ambient light brightness value, wherein the first frame rate is a lowest frame rate at which a video shot by a camera reaches a preset brightness under a current ambient light brightness value; step 200, calculating a second frame rate according to the current vehicle speed, wherein the second frame rate is the lowest frame rate at which no tailing exists in the video shot by the camera under the current ambient light brightness value and the current vehicle speed; step 300, judging whether the first frame rate is greater than or equal to the second frame rate, if so, taking the first frame rate as a final shooting frame rate, and entering step 500, otherwise, entering the next step; step 400, determining a final shooting frame rate according to a preset rule; and 500, determining the exposure duration of each frame of the camera according to the final shooting frame rate. The invention realizes the automatic adjustment of the shooting frame rate of the camera.
Description
Technical Field
The invention relates to the technical field of cameras, in particular to a camera frame rate adjusting method.
Background
At present, the stream media rearview mirror is more and more popular on the automobile due to the unique visual field advantage. Unlike the conventional mirror rearview mirror, the streaming media rearview mirror needs to illuminate the display terminal through backlight and acquire an image through a camera for displaying. Therefore, the brightness adjustment and frame rate adjustment of the streaming media rearview mirror become the key to whether the display is comfortable, especially at night, when the driving speed is high, the too high frame rate can reduce the exposure of the picture, resulting in insufficient brightness of the picture, the too low frame rate can result in the trailing of the video, thereby affecting the display effect, the brightness of the display terminal can also cause certain influence on the driver, the too bright can become an interference source, and the too dark can not achieve the ideal display effect.
Therefore, the prior art is in need of further improvement.
Disclosure of Invention
The invention provides a method for adjusting the frame rate of a camera, aiming at overcoming the defects in the prior art and realizing the automatic adjustment of the shooting frame rate of the camera.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a camera frame rate adjusting method, which comprises the following steps:
step 100, calculating a first frame rate according to an ambient light brightness value, wherein the first frame rate is a lowest frame rate at which a video shot by a camera reaches a preset brightness under a current ambient light brightness value;
step 200, calculating a second frame rate according to the current vehicle speed, wherein the second frame rate is the lowest frame rate at which no tailing exists in the video shot by the camera under the current ambient light brightness value and the current vehicle speed;
step 300, judging whether the first frame rate is greater than or equal to the second frame rate, if so, taking the first frame rate as a final shooting frame rate, and entering step 500, otherwise, entering the next step;
step 400, determining a final shooting frame rate according to a preset rule;
and 500, determining the exposure duration of each frame of the camera according to the final shooting frame rate.
Further, before the step 100, the method further includes:
001, judging whether the current ambient light brightness value is larger than a preset brightness threshold value, if so, shooting according to a preset automatic mode, and if not, entering the next step;
and 002, adjusting the brightness of the display terminal to the optimal brightness value according to the current ambient light brightness value.
Further, after the step 300 and before the step 400, the method further includes:
step 301, judging whether the preset brightness of the video is greater than or equal to the optimal brightness value of the display terminal, if so, calculating a third frame rate, and entering the next step, otherwise, entering step 400, wherein the third frame rate is the lowest frame rate at which the video shot by the camera under the current ambient light brightness value reaches the optimal brightness value of the display terminal;
step 302, determining whether the third frame rate is greater than or equal to the second frame rate, if so, taking the third frame rate as a final shooting frame rate, otherwise, entering the next step.
Specifically, the step 002 includes:
0021, calculating a target brightness value of the display terminal according to the current environment brightness value;
step 0022, calculating a difference value between the target brightness value and the current brightness value;
step 0023, if the difference is larger than a first preset threshold, adjusting the brightness of the display terminal according to a first preset adjusting rule, and if the difference is smaller than a second preset threshold, adjusting the brightness of the display terminal according to a second preset adjusting rule.
Specifically, the first preset adjustment rule includes:
step A1, calculating a change reference quantity according to the minimum adjustable brightness value and the maximum adjustable brightness value of the display terminal and the gray level number of the display terminal;
step A2, calculating a first ratio, wherein the first ratio is the ratio of the difference value between the target brightness value and the current brightness value to the current brightness value;
step A3, judging whether the first ratio is less than or equal to the product of the change reference quantity and the brightness adjustment stepping number, if so, maintaining the brightness value of the display terminal unchanged, otherwise, entering the next step;
and A4, judging whether the current brightness value of the display terminal is the target brightness, if so, finishing the adjustment, otherwise, stepping the next-level brightness value of the display terminal at a preset speed based on a first adjustment formula.
Specifically, the first adjustment formula is: lx denotes a luminance value of a next stage of the display terminal, Lc denotes a current luminance value of the display terminal, k denotes a number of luminance adjustment steps, and β denotes a change reference amount.
Specifically, the second preset adjustment rule includes:
b1, calculating a change reference quantity according to the minimum adjustable brightness value and the maximum adjustable brightness value of the display terminal and the gray level number of the display terminal;
step B2, calculating a second ratio alpha 2, wherein the second ratio is the ratio of the difference value between the current brightness value and the target brightness value to the current brightness value;
step B3, judging whether the second ratio alpha 2 is less than or equal to the variation reference quantity beta, if so, keeping the brightness value of the display terminal unchanged, otherwise, entering the next step;
and step B4, judging whether the current brightness value of the display terminal is the target brightness, if so, finishing the adjustment, otherwise, stepping the brightness value of the next stage of the display terminal step by step based on a second adjustment formula.
Specifically, the second adjustment formula is: lx is Lc/(1+ β), where Lx denotes a luminance value of a next stage of the display terminal, Lc denotes a current luminance value of the display terminal, and β denotes a variation reference amount.
Specifically, the change reference amount is calculated according to the following formula:
wherein β represents a change reference amount, l (min) represents a minimum adjustable luminance value of the display terminal, l (max) represents a maximum adjustable luminance value, and n represents a number of gray levels of the display terminal.
Specifically, the preset rule is as follows:
Fs＝[k1*F1+k2*F2]/(k1+k2)，
wherein Fs is a final photographing frame rate, F1 denotes a first frame rate, and F2 denotes a second frame rate; k1 ═ C/C0, where C0 denotes an ambient light brightness value at which the video can reach a preset brightness when photographed at the highest frame rate, and C denotes a current ambient light brightness value; k2 is V0/V, and V0 indicates a vehicle speed value at which the video does not end up when captured at the lowest frame rate.
Specifically, the exposure duration of each frame of the camera is determined according to the following formula: te is 1/Fs-Tr, where Te denotes an exposure time period and Tr is a readout time of one row of pixels.
The invention has the beneficial effects that: according to the invention, the first frame rate and the second frame rate are respectively calculated according to the ambient light brightness value and the current vehicle speed, the final shooting frame rate is determined according to the relation between the first frame rate and the second frame rate, the exposure duration of each frame of the camera is further determined, and the automatic adjustment of the shooting frame rate of the camera is realized.
Drawings
Fig. 1 is a flow chart of a camera frame rate adjusting method 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.
Example 1
As shown in fig. 1, the present embodiment provides a camera frame rate adjusting method, including:
step 100, calculating a first frame rate F1 according to the ambient light brightness value, where the first frame rate F1 is a lowest frame rate at which a video shot by a camera reaches a preset brightness under the current ambient light brightness value.
In specific implementation, according to the frame rate, the exposure time, the internal gain, and the relationship between the ambient light brightness value and the image brightness of the camera, the lowest frame rate F1 at which the video captured by the camera reaches the preset brightness at the current ambient light brightness value can be determined.
Step 200, calculating a second frame rate F2 according to the current vehicle speed, where the second frame rate F2 is a lowest frame rate at which no smear exists in the video captured by the camera at the current ambient light brightness value and the current vehicle speed.
For a static object, a smooth and non-trailing visual effect can be obtained by shooting with 24FPS generally, while for a moving object, a higher frame rate is needed to shoot to obtain the smooth and non-trailing visual effect, otherwise, when the frame rate is too low, the video picture is discontinuous due to the fact that the moving object changes faster, and a click feeling is generated.
Step 300, determining whether the first frame rate F1 is greater than or equal to the second frame rate F2, if so, taking the first frame rate F1 as the final shooting frame rate Fs, and proceeding to step 500, otherwise, proceeding to the next step.
When the first frame rate F1 is greater than or equal to the second frame rate F2, it indicates that the video captured at the first frame rate F1 can reach the preset brightness and no tailing phenomenon occurs, and it is appropriate to use the first frame rate F1 as the final capturing frame rate.
When the first frame rate F1 < the second frame rate F2, it is explained that if the photographed video is to reach the preset brightness, the photographing frame rate needs to be lower than the second frame rate F2.
And step 400, determining the final shooting frame rate Fs according to a preset rule.
In this embodiment, the preset rule is:
Fs＝[k1*F1+k2*F2]/(k1+k2)，
wherein Fs is a final photographing frame rate, F1 denotes a first frame rate, and F2 denotes a second frame rate; k1 ═ C/C0, where C0 denotes an ambient light brightness value at which the video can reach a preset brightness when photographed at the highest frame rate, and C denotes a current ambient light brightness value; k2 is V0/V, and V0 indicates a vehicle speed value at which the video does not end up when captured at the lowest frame rate.
The C0 and V0 can be obtained by a method of experimental calibration.
And 500, determining the exposure duration Te of each frame of the camera according to the final shooting frame rate Fs.
In this embodiment, the exposure time of each frame of the camera is determined according to the following formula: te is 1/Fs-Tr, where Te denotes an exposure time period and Tr is a readout time of one row of pixels.
Example 2
Unlike embodiment 1, this embodiment further includes, before step 100:
and 001, judging whether the current ambient light brightness value is larger than a preset brightness threshold value, if so, shooting according to a preset automatic mode, and if not, entering the next step.
If the current ambient light brightness value is larger than the preset brightness threshold value, the current ambient light brightness is higher, the frame rate control requirement of the preset automatic mode can be met, and the shooting frame rate does not need to be adjusted.
The current ambient light brightness value can be obtained according to a specific light sensor of the product, and the ambient light brightness value in front of or behind the product is taken, which is not limited in the present invention.
And 002, adjusting the brightness of the display terminal to the optimal brightness value according to the current ambient light brightness value.
In this embodiment, the step 002 includes:
step 0021, calculating a target brightness value of the display terminal according to the current environment brightness value.
In specific implementation, a target brightness value of the display terminal can be obtained by looking up a table according to the current ambient light brightness value through a calibrated brightness adjustment curve of the display terminal.
Step 0022, calculating a difference between the target brightness value and the current brightness value.
Step 0023, if the difference is larger than a first preset threshold, adjusting the brightness of the display terminal according to a first preset adjusting rule, and if the difference is smaller than a second preset threshold, adjusting the brightness of the display terminal according to a second preset adjusting rule.
In this embodiment, the first preset threshold is a positive value, and the second preset threshold is a negative value.
In this embodiment, the first preset adjustment rule includes:
step A1, calculating a variation reference amount beta according to the minimum adjustable brightness value L (min), the maximum adjustable brightness value L (max) and the gray scale number n of the display terminal.
In the present embodiment, the change reference amount β is calculated according to the following equation:
wherein β represents a change reference amount, l (min) represents a minimum adjustable luminance value of the display terminal, l (max) represents a maximum adjustable luminance value, and n represents a number of gray levels of the display terminal.
Step a2, calculating a first ratio α 1, where the first ratio is a ratio of a difference between the target brightness value and the current brightness value to the current brightness value.
Step a3, determining whether the first ratio α 1 is less than or equal to the product of the variation reference β and the brightness adjustment step number k, if yes, maintaining the brightness value of the display terminal unchanged, otherwise, entering the next step.
And A4, judging whether the current brightness value of the display terminal is the target brightness, if so, finishing the adjustment, otherwise, stepping the next-level brightness value of the display terminal at a preset speed based on a first adjustment formula.
The first adjustment formula is: lx denotes a luminance value of a next stage of the display terminal, Lc denotes a current luminance value of the display terminal, k denotes a number of luminance adjustment steps, and β denotes a change reference amount.
In this embodiment, the second preset adjustment rule includes:
and step B1, calculating the change reference amount beta according to the minimum adjustable brightness value L (min) and the maximum adjustable brightness value L (max) of the display terminal and the gray scale level number n of the display terminal.
In the present embodiment, the change reference amount β is calculated according to the following equation:
wherein β represents a change reference amount, l (min) represents a minimum adjustable luminance value of the display terminal, l (max) represents a maximum adjustable luminance value, and n represents a number of gray levels of the display terminal.
And step B2, calculating a second ratio alpha 2, wherein the second ratio is the ratio of the difference value between the current brightness value and the target brightness value to the current brightness value.
And step B3, judging whether the second ratio alpha 2 is less than or equal to the change reference quantity beta, if so, keeping the brightness value of the display terminal unchanged, otherwise, entering the next step.
And step B4, judging whether the current brightness value of the display terminal is the target brightness, if so, finishing the adjustment, otherwise, stepping the brightness value of the next stage of the display terminal step by step based on a second adjustment formula.
The second adjustment formula is: lx is Lc/(1+ β), where Lx denotes a luminance value of a next stage of the display terminal, Lc denotes a current luminance value of the display terminal, and β denotes a variation reference amount.
Example 3
Different from embodiment 2, this embodiment further includes, after step 300 and before step 400:
step 301, determining whether the preset brightness of the video is greater than or equal to the optimal brightness value of the display terminal, if so, calculating a third frame rate F3, and proceeding to the next step, otherwise, entering step 400, where the third frame rate F3 is a lowest frame rate at which the video shot by the camera reaches the optimal brightness value of the display terminal under the current ambient light brightness value.
Step 302, determining whether the third frame rate F3 is greater than or equal to the second frame rate F2, if so, taking the third frame rate F3 as the final shooting frame rate Fs, otherwise, entering the next step.
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 (10)
1. A camera frame rate adjustment method, comprising:
step 100, calculating a first frame rate according to an ambient light brightness value, wherein the first frame rate is a lowest frame rate at which a video shot by a camera reaches a preset brightness under a current ambient light brightness value;
step 200, calculating a second frame rate according to the current vehicle speed, wherein the second frame rate is the lowest frame rate at which no tailing exists in the video shot by the camera under the current ambient light brightness value and the current vehicle speed;
step 300, judging whether the first frame rate is greater than or equal to the second frame rate, if so, taking the first frame rate as a final shooting frame rate, and entering step 500, otherwise, entering the next step;
step 400, determining a final shooting frame rate according to a preset rule;
and 500, determining the exposure duration of each frame of the camera according to the final shooting frame rate.
2. The camera frame rate adjustment method according to claim 1, further comprising, before the step 100:
001, judging whether the current ambient light brightness value is larger than a preset brightness threshold value, if so, shooting according to a preset automatic mode, and if not, entering the next step;
and 002, adjusting the brightness of the display terminal to the optimal brightness value according to the current ambient light brightness value.
3. The camera frame rate adjustment method according to claim 2, further comprising, after the step 300 and before the step 400:
step 301, judging whether the preset brightness of the video is greater than or equal to the optimal brightness value of the display terminal, if so, calculating a third frame rate, and entering the next step, otherwise, entering step 400, wherein the third frame rate is the lowest frame rate at which the video shot by the camera under the current ambient light brightness value reaches the optimal brightness value of the display terminal;
step 302, determining whether the third frame rate is greater than or equal to the second frame rate, if so, taking the third frame rate as a final shooting frame rate, otherwise, entering the next step.
4. The camera frame rate adjustment method according to claim 2, wherein the step 002 comprises:
0021, calculating a target brightness value of the display terminal according to the current environment brightness value;
step 0022, calculating a difference value between the target brightness value and the current brightness value;
step 0023, if the difference is larger than a first preset threshold, adjusting the brightness of the display terminal according to a first preset adjusting rule, and if the difference is smaller than a second preset threshold, adjusting the brightness of the display terminal according to a second preset adjusting rule.
5. The camera frame rate adjustment method of claim 4, wherein the first preset adjustment rule comprises:
step A1, calculating a change reference quantity according to the minimum adjustable brightness value and the maximum adjustable brightness value of the display terminal and the gray level number of the display terminal;
step A2, calculating a first ratio, wherein the first ratio is the ratio of the difference value between the target brightness value and the current brightness value to the current brightness value;
step A3, judging whether the first ratio is less than or equal to the product of the change reference quantity and the brightness adjustment stepping number, if so, maintaining the brightness value of the display terminal unchanged, otherwise, entering the next step;
and A4, judging whether the current brightness value of the display terminal is the target brightness, if so, finishing the adjustment, otherwise, stepping the next-level brightness value of the display terminal at a preset speed based on a first adjustment formula.
6. The method according to claim 5, wherein the first adjustment formula is: lx denotes a luminance value of a next stage of the display terminal, Lc denotes a current luminance value of the display terminal, k denotes a number of luminance adjustment steps, and β denotes a change reference amount.
7. The camera frame rate adjustment method of claim 4, wherein the second preset adjustment rule comprises:
b1, calculating a change reference quantity according to the minimum adjustable brightness value and the maximum adjustable brightness value of the display terminal and the gray level number of the display terminal;
step B2, calculating a second ratio, wherein the second ratio is the ratio of the difference value between the current brightness value and the target brightness value to the current brightness value;
step B3, judging whether the second ratio is less than or equal to the change reference quantity, if so, keeping the brightness value of the display terminal unchanged, otherwise, entering the next step;
and step B4, judging whether the current brightness value of the display terminal is the target brightness, if so, finishing the adjustment, otherwise, stepping the brightness value of the next stage of the display terminal step by step based on a second adjustment formula.
8. The camera frame rate adjustment method of claim 7, wherein the second adjustment formula is: lx is Lc/(1+ β), where Lx denotes a luminance value of a next stage of the display terminal, Lc denotes a current luminance value of the display terminal, and β denotes a variation reference amount.
9. The camera frame rate adjustment method according to any one of claims 5 to 8, wherein the change reference amount is calculated according to the following formula:
wherein β represents a change reference amount, l (min) represents a minimum adjustable luminance value of the display terminal, l (max) represents a maximum adjustable luminance value, and n represents a number of gray levels of the display terminal.
10. The method according to claim 1, wherein the preset rule is:
Fs＝[k1*F1+k2*F2]/(k1+k2)，
wherein Fs is a final photographing frame rate, F1 denotes a first frame rate, and F2 denotes a second frame rate; k1 ═ C/C0, where C0 denotes an ambient light brightness value at which the video can reach a preset brightness when photographed at the highest frame rate, and C denotes a current ambient light brightness value; k2 is V0/V, and V0 indicates a vehicle speed value at which the video does not end up when captured at the lowest frame rate.
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| CN116347224A (en) * | 2022-10-31 | 2023-06-27 | 荣耀终端有限公司 | Shooting frame rate control method, electronic device, chip system and readable storage medium |
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