CN102984455A - Auxiliary light source control method - Google Patents
Auxiliary light source control method Download PDFInfo
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- CN102984455A CN102984455A CN2012104647327A CN201210464732A CN102984455A CN 102984455 A CN102984455 A CN 102984455A CN 2012104647327 A CN2012104647327 A CN 2012104647327A CN 201210464732 A CN201210464732 A CN 201210464732A CN 102984455 A CN102984455 A CN 102984455A
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- secondary light
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Abstract
The invention discloses an auxiliary light source control method which includes utilizing adjustable auxiliary light source existing in the market, reading vidicon parameter in real-time through a micro processing unit, and automatically adjusting the adjustable auxiliary light source parameter according to the parameter condition of the vidicon. The auxiliary light source control method has the advantages of enabling the adjustable auxiliary light sourcing to adapt to the vidicon and the external environment, enabling the vidicon to achieve best night vision effect, increasing all-weather monitoring capability of the vidicon, overcoming existing shortcomings of night monitoring and being strong in adaptability and modifiability.
Description
Technical field
The present invention relates to field of video monitoring, the method that the adjustable secondary light source of night monitoring is controlled automatically according to camera parameters under especially a kind of round-the-clock monitoring condition.
Background technology
At present, along with the demand of safety monitoring equipment constantly increases, the continuous expansion of application, people to the requirement of watch-dog also in continuous increase.Watch-dog is applied to round-the-clock monitoring more and more, and under the external environment of pattern low-light (level) at night, the application of secondary light source is also more and more extensive.The floor light light source of at present extensive use has infrared lamp, laser and white light.
The application of secondary light source has active influence for the monitoring under night low-illumination, but the application of secondary light source still exists some problems at present, such as, adjustable secondary light source hot spot is excessive, can affect light filling brightness, and the remote monitor effect is bad; Hot spot is too small " flashlight effect " then can to occur often saying, and hot spot can't the coverage goal field of view; When there was visual light source in the external world, secondary light source was still very bright, strong reflective overexposure phenomenon will occur; Extraneous without any light source, and the secondary light source luminance shortage, a large amount of noises will appear in video camera, has a strong impact on monitoring effect.
For the drawback of this phenomenon, also have in the market a plurality of adjustable secondary light sources and use simultaneously, each adjustable secondary light source is for the solution of different distance, but this kind method circuit is loaded down with trivial details, control is complicated, can take very large space simultaneously, and it is very inconvenient to use.Simultaneously, to the not remarkable especially effective method of the control of brightness.
Along with the development of integrated adjustable secondary light source, increasing adjustable secondary light source occurs, and can by the user from main regulation spot size and brightness, still, arrange often cumbersome and passive by user oneself.
Summary of the invention
The objective of the invention is to overcome defective of the prior art, a kind of method that can automatically adjust according to camera parameter secondary light source is provided, be intended to solve under the night low-illumination environment, adjustable secondary light source can be adjusted automatically according to camera parameters, to reach best light filling effect.
For addressing the above problem, a kind of secondary light source control method of the present invention may further comprise the steps:
1) secondary light source control system initialization, and read the day pattern that current video camera is given tacit consent to;
2) per blanking time t
0Read the day and night pattern of a video camera;
3) judge that whether the current day and night pattern of video camera is a day pattern, if judged result is yes, enters step 4); If the determination result is NO, then enter step 5);
4) judge the last video camera that reads day and night pattern whether be the pattern at night; If judged result is yes, enter step 6); If the determination result is NO, enter step 2);
5) judge the last video camera that reads day and night pattern whether be a day pattern; If judged result is yes, enter step 7); If the determination result is NO, enter step 8);
6) close secondary light source, enter step 2);
7) open secondary light source, enter step 8);
8) judge that whether video camera has the zoom operation, if judged result is yes, enters step 9); If the determination result is NO, enter step 12);
9) read the camera zoom value;
10) obtain secondary light source spot size value according to the camera zoom value;
11) the control secondary light source changes spot size, and enters step 8).
12) read the camera gain value;
13) judge that the camera gain value whether greater than the optimum interval upper limit, if judged result is yes, enters step 14); If the determination result is NO, enter step 15);
14) improve secondary light source brightness, and enter step 12);
15) judge that the camera gain value whether less than the optimum interval lower limit, if judged result is yes, enters step 16); If the determination result is NO, enter step 2);
16) reduce secondary light source brightness, and enter step 12).
Described t
0Be 2～30s.
Adopt secondary light source control method of the present invention, have following beneficial effect:
1, utilize the microprocessor module that often has in the supervisory control system to do control algorithm, need not to increase other equipment and just can realize Intelligent treatment, workable, intelligent degree is high;
2, utilize that existing adjustable secondary light source module realizes automatically regulating according to camera parameters on the market, can adapt to many regions dynamic environment, realize best night vision effect;
3, utilize camera parameters as input information, need not to increase in addition checkout gear, fast response time, the interlock effect is accurate, and timeliness is strong, but maintenance effects is good;
4, the present invention can adjust adjustable secondary light source interlock variation in real time according to the variation of camera parameters, increases video camera night monitoring effect, realizes intelligent management, has also saved cost simultaneously.
Description of drawings
Fig. 1 is for using the control system structured flowchart of secondary light source control method of the present invention.
Fig. 2 is the flow chart of secondary light source control method of the present invention.
Embodiment
In order to make those skilled in the art person understand better technical solution of the present invention, the present invention is described in further detail below in conjunction with drawings and embodiments.
As shown in Figure 1, use the control system of secondary light source control method of the present invention to comprise microprocessor, and the video camera that links to each other with microprocessor and secondary light source.
What wherein microprocessor can be in digital signal processor or risc microcontroller or complicated programmable logic cells or field programmable logic array or the single-chip microcomputer is a kind of.
Secondary light source can be in adjustable infrared lamp or tunable laser or the adjustable white light lamp a kind of.
Described video camera can be zoomable video camera.
As shown in Figure 2, a kind of secondary light source control method of the present invention may further comprise the steps:
1) secondary light source control system initialization, video camera is defaulted as a day pattern when starting usually, and microprocessor reads the day pattern of current video camera acquiescence;
2) per blanking time t
0Read the day and night pattern of a video camera;
3) judge that whether the current day and night pattern of video camera is a day pattern, if judged result is yes, enters step 4); If the determination result is NO, then enter step 5);
4) judge the last video camera that reads day and night pattern whether be the pattern at night; If judged result is yes, enter step 6); If the determination result is NO, enter step 2);
5) judge the last video camera that reads day and night pattern whether be a day pattern; If judged result is yes, enter step 7); If the determination result is NO, enter step 8);
6) close secondary light source, enter step 2);
7) open secondary light source, enter step 8);
8) judge that whether video camera has the zoom operation, if judged result is yes, enters step 9); If the determination result is NO, enter step 12);
9) read the camera zoom value;
10) obtain secondary light source spot size value according to the camera zoom value;
11) the control secondary light source changes spot size, and enters step 8).
12) read the camera gain value;
13) judge that the camera gain value whether greater than the optimum interval upper limit, if judged result is yes, enters step 14); If the determination result is NO, enter step 15);
14) improve secondary light source brightness, and enter step 12);
15) judge that the camera gain value whether less than the optimum interval lower limit, if judged result is yes, enters step 16); If the determination result is NO, enter step 2);
16) reduce secondary light source brightness, and enter step 12).
Pass through above-mentioned steps, the day and night pattern information of microprocessor acquisition camera, by judging day and night mode state of current video camera, thereby be implemented in the automatically unlatching of control secondary light source under the mode state at night, and under the day pattern automatic closing of control secondary light source.
When secondary light source is opened, whether microprocessor real-time judge video camera zoom, and during camera zoom, microprocessor reads the camera zoom value, obtain corresponding adjustable secondary light source spot size according to the camera zoom value, and control adjustable secondary light source and regulate spot size.
For each video camera, the corresponding fixing angle of visual field of each zoom value under the corresponding angle of visual field, only has the secondary light source of maintenance hot spot just to cover camera field of view, just can make secondary light source reach best effect.
Obtain corresponding secondary light source spot size according to the camera zoom value, acquisition methods is the corresponding relation of setting up camera zoom value and adjustable secondary light source spot size by method of testing, form relation function or related table, by function calculation or the acquisition of tabling look-up; Requirement is that adjustable secondary light source hot spot remains and is full of viewing field of camera.
The variation of the variation of camera zoom and secondary light source hot spot can affect the video camera effect.When video camera was seen close shot, the too high meeting of brightness caused overexposure, does not see details; When seeing distant view, it is on the low side that same brightness can seem again, so need to regulate secondary light source brightness this moment.
The camera gain value is a to external world concrete manifestation parameter of ambient brightness of video camera.Under the night mode state, if do not have external light source simultaneously during the secondary light source luminance shortage, video camera can strengthen gain automatically, to improve general image brightness, but the excessive consequence of bringing that gains is that the image noise strengthens thereupon, and the flakes noise seriously increases, and affects people's visual experience and monitoring effect, at this moment, need suitably to increase secondary light source brightness to improve monitoring effect; Otherwise, when exist external light source simultaneously secondary light source still cross when bright, can cause the image overexposure reflective serious, do not see the monitoring objective details, this moment, camera gain can reduce, and may cause local overexposure and other local luminance shortage need suitably to reduce secondary light source brightness in this case.In a word, only have to keep ambient lighting brightness when a suitable scope, camera gain can remain in the fixing interval, just can reach best monitoring effect.
The present invention uses existing adjustable secondary light source on the market, read in real time camera parameters by microprocessor module, realize automatically adjusting adjustable secondary light source parameter according to the camera parameters state, make adjustable secondary light source self adaptation video camera and external environment, and make video camera can reach best night vision effect, increase the round-the-clock monitoring capacity of video camera, overcome the existing existing shortcoming of night monitoring, also have the advantage adaptable, that alterability is strong.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (2)
1. secondary light source control method may further comprise the steps:
1) secondary light source control system initialization, and read the day pattern that current video camera is given tacit consent to;
2) per blanking time t
0Read the day and night pattern of a video camera;
3) judge that whether the current day and night pattern of video camera is a day pattern, if judged result is yes, enters step 4); If the determination result is NO, then enter step 5);
4) judge the last video camera that reads day and night pattern whether be the pattern at night; If judged result is yes, enter step 6); If the determination result is NO, enter step 2);
5) judge the last video camera that reads day and night pattern whether be a day pattern; If judged result is yes, enter step 7); If the determination result is NO, enter step 8);
6) close secondary light source, enter step 2);
7) open secondary light source, enter step 8);
8) judge that whether video camera has the zoom operation, if judged result is yes, enters step 9); If the determination result is NO, enter step 12);
9) read the camera zoom value;
10) obtain secondary light source spot size value according to the camera zoom value;
11) the control secondary light source changes spot size, and enters step 8).
12) read the camera gain value;
13) judge that the camera gain value whether greater than the optimum interval upper limit, if judged result is yes, enters step 14); If the determination result is NO, enter step 15);
14) improve secondary light source brightness, and enter step 12);
15) judge that the camera gain value whether less than the optimum interval lower limit, if judged result is yes, enters step 16); If the determination result is NO, enter step 2);
16) reduce secondary light source brightness, and enter step 12).
2. secondary light source control method as claimed in claim 1 is characterized in that: described t
0Be 2～30s.
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| CN104253945A (en) * | 2013-06-26 | 2014-12-31 | 杭州海康威视数字技术股份有限公司 | Realization method of high-definition camera and high-definition camera |
| WO2015070767A1 (en) * | 2013-11-18 | 2015-05-21 | 杭州海康威视数字技术股份有限公司 | High-definition camera implementation method and high-definition camera |
| CN105116543A (en) * | 2015-08-17 | 2015-12-02 | 浪潮集团有限公司 | A laser night vision device synchronous zooming time-delay optimization method |
| WO2017147841A1 (en) * | 2016-03-03 | 2017-09-08 | 陈台国 | System for night photography and method thereof |
| CN108429885A (en) * | 2017-02-13 | 2018-08-21 | 杭州海康威视数字技术股份有限公司 | A kind of inter-linked controlling method, the apparatus and system of laser and video camera |
| CN110618569A (en) * | 2019-09-23 | 2019-12-27 | 天津天地基业科技有限公司 | Method for automatic zoom linkage of laser light spots |
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| CN110618569A (en) * | 2019-09-23 | 2019-12-27 | 天津天地基业科技有限公司 | Method for automatic zoom linkage of laser light spots |
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Application publication date: 20130320 |