CN110618569A - Method for automatic zoom linkage of laser light spots - Google Patents
Method for automatic zoom linkage of laser light spots Download PDFInfo
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- CN110618569A CN110618569A CN201910900169.5A CN201910900169A CN110618569A CN 110618569 A CN110618569 A CN 110618569A CN 201910900169 A CN201910900169 A CN 201910900169A CN 110618569 A CN110618569 A CN 110618569A
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- light spot
- edge brightness
- size parameter
- spot size
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B15/00—Special procedures for taking photographs; Apparatus therefor
- G03B15/02—Illuminating scene
- G03B15/03—Combinations of cameras with lighting apparatus; Flash units
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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
- H04N23/71—Circuitry for evaluating the brightness variation
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- Engineering & Computer Science (AREA)
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Abstract
The invention provides a method for automatically linking laser light spots along with zooming, which comprises the following steps: A. normalizing the light spot, and initializing a light spot size parameter; B. increasing the size parameter of the light spot under a fixed multiplying power, and detecting the edge brightness of the image in real time; C. setting a threshold value of image edge brightness; D. when the image edge brightness is larger than the threshold value, stopping increasing the light spot size parameter; E. when the multiplying power of the camera is reduced, the adjusting light spot size parameter is increased, and when the multiplying power is increased, the adjusting light spot size parameter is reduced; F. and after the magnification is stable, detecting whether the edge brightness of the image exceeds a threshold value, if not, repeating the step B-D, if so, reducing the spot size parameter until the edge brightness is smaller than the threshold value, and repeating the step B-D. The invention has the beneficial effects that: the light spot and the multiplying power of the camera form a linkage relation, the image edge brightness is judged, the current laser light spot paving degree is evaluated, and the light spot size is adjusted to meet the requirement.
Description
Technical Field
The invention belongs to the technical field of video monitoring, and particularly relates to a method for automatic zoom-following linkage of laser light spots.
Background
In video monitoring, some equipment night vision light filling that monitoring distance is far away need use the laser instrument, and the light source of laser instrument has the range far away, characteristics such as luminance height, and the laser instrument often can adjust the facula size of laser lamp from taking a camera lens, and the facula is smaller, and light is just concentrated more, and luminance is also higher, is fit for the application that the angle of vision is less but the distance is far away, and the facula is bigger on the contrary, and light energy dispersion, luminance is lower, and this scene that just is fit for the angle of vision big. This means that, when the camera is suitable for large light spots under small multiplying power and is suitable for small light spots under large multiplying power, if this requirement is to be met in the past, a fixed multiplying power and light spot size one-to-one table is often made, the light-like size numerical value corresponding to the corresponding multiplying power is inquired under each multiplying power, the laser is controlled to change to the specified light spot size, so that the flexibility is lacked, and in the early stage, the proper light spot size needs to be adjusted and recorded under each multiplying power manually, which wastes time and labor and cannot adapt to all scenes.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for automatically linking the laser light spot with the change of magnification, so as to solve the above-mentioned problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for automatically linking laser light spots with variable magnification comprises the following steps:
A. normalizing the light spot generated by the laser and initializing a light spot size parameter;
B. the camera increases the size parameter of the light spot under a fixed multiplying power and detects the edge brightness of the image in real time;
C. setting a threshold value of image edge brightness;
D. when the image edge brightness is larger than the threshold value of the image edge brightness, stopping increasing the size parameter of the light spot;
E. when the multiplying power of the camera is reduced, the adjustment spot size parameter is increased,
when the multiplying power is increased, the adjusting light spot size parameter is reduced;
F. when the magnification of the camera is stable, whether the edge brightness of the image exceeds the threshold value of the edge brightness of the image is detected,
if the threshold for image edge brightness is not exceeded, steps B-D are repeated,
and if the image edge brightness threshold value is exceeded, adjusting the spot size parameter to be reduced until the edge brightness is smaller than the image edge brightness threshold value, and repeating the steps B-D.
Further, the minimum value of the spot size parameter is 1, and the maximum value is 1024.
Further, the threshold value of the image edge brightness is 60.
Further, the initialization spot size parameter value in step a is 1.
Further, the step of the spot size parameter is 2.
Further, the normalized formula in the step A is as follows,
B＝100*A/M，
wherein, A is the value of each spot size, M is the maximum value of the spot size that can be irradiated by the laser, and B is the value after normalization.
Compared with the prior art, the method for automatically linking the laser light spots with the variable magnification has the following advantages:
the method for automatically linking the laser light spot with the variable magnification is used for a variable-magnification camera and a laser with a variable light spot size, so that the light spot and the magnification of the camera form a linkage relation, the image edge brightness is judged, the current spreading degree of the laser light spot is evaluated, and the light spot size is adjusted to meet the requirement.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a method for automatic zoom-dependent linkage of a laser light spot according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, a method for automatic zoom-dependent linkage of laser light spots includes the following steps:
A. normalizing the light spot generated by the laser, and initializing a light spot size parameter spot;
B. the camera increases the spot size parameter spot under the fixed multiplying power, the step is 2, the edge brightness of the image is detected in real time, the spot size parameter spot is small at the beginning, the edge brightness of the image is close to 0, and the spot is close to and fully paved on the whole picture along with the increase of the spot size parameter spot, and the edge brightness of the image is rapidly increased;
C. setting a threshold thresh of the image edge brightness;
D. when the image edge brightness is larger than the threshold thresh of the image edge brightness, stopping increasing the spot size parameter spot, wherein the spot is close to and fully paved on the whole picture although the edge does not reach the brightest point, and if the image edge brightness needs to be increased, increasing the threshold thresh of the image edge brightness;
E. when the multiplying power zoom of the camera is reduced, the spot of the spot size adjusting parameter is increased, and the step is 2; when the multiplying power zoom is increased, the spot size parameter spot is adjusted to be reduced, and the stepping step is 2;
F. and after the magnification of the camera is stabilized, detecting whether the image edge brightness exceeds a threshold thresh of the image edge brightness, if not, repeating the steps B-D, if so, adjusting spot to be reduced until the edge brightness EdgeBrightness is less than the threshold thresh of the image edge brightness, and repeating the steps B-D.
The minimum value of the spot size parameter spot is 1, and the maximum value is 1024.
The threshold thresh of the image edge brightness is 60.
The initialized spot size parameter value in the step A is 1.
The formula for the normalization in step a is,
B＝100*A/M，
wherein, A is the value of each spot size, M is the maximum value of the spot size that can be irradiated by the laser, B is the normalized value, normalization is only the absolute value of the spot size, and such normalization is convenient for calculation and compatibility.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A method for automatically linking laser light spots with variable magnification is characterized by comprising the following steps:
A. normalizing the light spot generated by the laser and initializing a light spot size parameter;
B. the camera increases the size parameter of the light spot under a fixed multiplying power and detects the edge brightness of the image in real time;
C. setting a threshold value of image edge brightness;
D. when the image edge brightness is larger than the threshold value of the image edge brightness, stopping increasing the size parameter of the light spot;
E. when the multiplying power of the camera is reduced, the adjustment spot size parameter is increased,
when the multiplying power is increased, the adjusting light spot size parameter is reduced;
F. when the magnification of the camera is stable, whether the edge brightness of the image exceeds the threshold value of the edge brightness of the image is detected,
if the threshold for image edge brightness is not exceeded, steps B-D are repeated,
and if the image edge brightness threshold value is exceeded, adjusting the spot size parameter to be reduced until the edge brightness is smaller than the image edge brightness threshold value, and repeating the steps B-D.
2. The method for automatic variable-magnification linkage of the laser light spot according to claim 1, characterized in that: the minimum value of the spot size parameter is 1, and the maximum value is 1024.
3. The method for automatic variable-magnification linkage of the laser light spot according to claim 1, characterized in that: the threshold value of the image edge brightness is 60.
4. The method for automatic variable-magnification linkage of the laser light spot according to claim 1, characterized in that: the initialized spot size parameter value in the step A is 1.
5. The method for automatic variable-magnification linkage of the laser light spot according to claim 1, characterized in that: the step of the spot size parameter is 2.
6. The method for automatic variable-magnification linkage of the laser light spot according to claim 1, characterized in that: the formula for the normalization in step a is,
B＝100*A/M，
wherein, A is the value of each spot size, M is the maximum value of the spot size that can be irradiated by the laser, and B is the value after normalization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910900169.5A CN110618569B (en) | 2019-09-23 | 2019-09-23 | Method for automatic zoom linkage of laser light spots |
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| CN201910900169.5A CN110618569B (en) | 2019-09-23 | 2019-09-23 | Method for automatic zoom linkage of laser light spots |
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| CN110618569A true CN110618569A (en) | 2019-12-27 |
| CN110618569B CN110618569B (en) | 2021-11-16 |
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