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A kind of overexposure control method and device

A control method and overexposure technology, applied in the field of photography, can solve the problems of overexposure of monitoring targets, loss of details of monitoring targets, failure to achieve monitoring purposes, etc., and achieve good effects and simple design

Active Publication Date: 2018-09-14
ZHEJIANG UNIVIEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this will bring a problem: when the monitoring target is close to the camera, the monitoring target will be overexposed, which will cause the details of the monitoring target to be lost, and the expected monitoring purpose cannot be achieved.

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  • A kind of overexposure control method and device
  • A kind of overexposure control method and device
  • A kind of overexposure control method and device

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Embodiment Construction

[0020] Aiming at the technical problems mentioned in the background art, the present invention provides an overexposure control scheme. The overexposure control scheme fundamentally solves the problem that the "far-sightedness" of the infrared camera and the "overexposure of nearby monitoring targets" cannot be taken into account; and the scheme is simple in design and has a good effect. The following describes in detail in a specific real-time manner.

[0021] Please refer to figure 1 The flow chart of the embodiment of the present invention shown.

[0022] S11. Divide the picture into m*n light metering units, and count the number N of pixels with grayscale values ​​between Tn and 255 in each light metering unit.

[0023] S12. Determine the photometric units Aij whose N is greater than or equal to a preset threshold K.

[0024] S13. If there is a photometry unit located in the infrared supplementary light area among the photometry units Aij, and there is a moving object i...

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Abstract

The invention provides a method for controlling overexposure. The method is applied to a camera and comprises the steps of dividing a picture into m*n light metering units, and calculating the number N of pixel points of which the gray value is between Tn and 255 in each light metering unit; determining light metering units Aij of which N is greater than or equal to a preset threshold value K; reducing the strength of an infrared light compensating lamp if the light metering units which are located in an infrared light compensating area exist in the light metering unit Aij and a motion object exists in the infrared light compensating area. The method for controlling the overexposure, provided by the invention, is simple and is convenient to realize; according to the method for controlling the exposure, the problem that consideration of the camera cannot be given to both a far-sight function and a near target overexposure monitoring function is solved.

Description

technical field [0001] The present invention relates to the technical field of imaging, in particular to an overexposure control method and device. Background technique [0002] As we all know, in order to improve the night vision ability of surveillance cameras, many models are equipped with infrared lights. The opening and closing of the infrared light can be automatically controlled by the camera. [0003] In order to improve the "far-sightedness" of the camera at night, it is often achieved by increasing the brightness of the infrared light or reducing the angle of the infrared light. But this will bring a problem: when the monitoring target is close to the camera, the monitoring target will be overexposed, resulting in the loss of details of the monitoring target, and the expected monitoring purpose cannot be achieved. How to avoid the overexposure of the monitoring target while realizing the camera's long-sightedness has become an urgent problem to be solved. Conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235
Inventor 陈晓雷
Owner ZHEJIANG UNIVIEW TECH CO LTD