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Automatic exposure method and system based on histogram

A technology of automatic exposure and histogram statistics, which is applied to TV system components, image communication, color TV components, etc., can solve problems such as overexposure, and achieve the effect of ensuring details and exposure close to balance

Active Publication Date: 2018-03-30
SANLI VIDEO FREQUENCY SCI & TECH SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an automatic exposure scheme based on histogram to solve the problem of overexposure or underexposure in the case of uneven brightness of the picture

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  • Automatic exposure method and system based on histogram
  • Automatic exposure method and system based on histogram
  • Automatic exposure method and system based on histogram

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Embodiment Construction

[0018] In order to describe the technical content, achieved goals and effects of the present invention in detail, the following descriptions will be made in conjunction with the embodiments and accompanying drawings.

[0019] The most critical idea of ​​the present invention is: obtain the average brightness and statistical information of the picture based on the histogram, recalculate the weighted value of each module in the picture, and then compare this value with the target brightness value to control the aperture, shutter and gain, etc. .

[0020] The main purpose of the present invention is to solve the problem of overexposure or underexposure when there are too bright or too dark pictures in the picture. Therefore, based on the working method of automatic exposure, automatic exposure technology has three very important core issues: light intensity measurement, scene analysis and exposure adjustment. The present invention proposes an automatic exposure method based on t...

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Abstract

The invention discloses an automatic exposure method and system based on a histogram, which includes a brightness acquisition step and a brightness analysis step. The brightness acquisition step includes: dividing the picture into several small grids, and acquiring the brightness value and histogram of each grid Statistical information; the brightness analysis step includes: obtaining the brightness weight value of each cell according to the histogram statistical information, and calculating the average brightness value of the screen. Through the above method, the present invention can take into account the brighter and darker parts of the picture and give different proportions, which can make the exposure of the picture close to balance and ensure as many details of the picture as possible.

Description

technical field [0001] The invention relates to a histogram-based automatic exposure method and system. Background technique [0002] Today, as the concept of safety is becoming more and more important, the importance of security monitoring systems is also becoming more and more prominent, especially in some sensitive places, such as banks, prisons, highways, etc. For the needs of safety and management, people need to know what happened in these places events and monitor these locations. Due to the monitoring requirements of these special places, more and more integrated cameras are required. In the integrated camera, the automatic exposure technology is one of the core technologies of the camera. Whether the automatic exposure can be realized quickly and accurately will directly affect the imaging effect of the picture. If the exposure is overexposed, the image will be too bright and some image details will be lost; Underexposure will cause the image to be too dark, and s...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/238H04N5/243H04N23/75H04N23/76
CPCH04N23/75H04N23/76
Inventor 张君李力杨伟强
Owner SANLI VIDEO FREQUENCY SCI & TECH SHENZHEN