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Method and device for automatic exposure compensation of backlit scenes in video imaging system

An imaging system and automatic exposure technology, applied in the field of image processing, can solve the problems of unrealistic video application and user inconvenience, and achieve the effects of simple and convenient operation, wide adaptability, and improved effectiveness and stability

Inactive Publication Date: 2012-10-10
无锡鸿图微电子技术有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

But this manual operation may be inconvenient for some users and not practical for video applications

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  • Method and device for automatic exposure compensation of backlit scenes in video imaging system
  • Method and device for automatic exposure compensation of backlit scenes in video imaging system
  • Method and device for automatic exposure compensation of backlit scenes in video imaging system

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0032] Such as figure 1 Shown is a flow chart of an existing automatic exposure compensation process 100 , wherein the existing automatic exposure control technology is based on measured image brightness average values, and a preset static target value brightness is obtained by comparing these average values. Specifically: starting from step 102, the image brightness average value Y ave is measured by the image statistic device 200, and then in step 104, the image brightness average value Y ave Comparison with a preset static target value; this detection is a threshold trigger. That is to say, the image statistician 200 counts the detected data frame by frame, and once the statistical data deviates from the corresponding degree of the static target value, the exposure control starts; the degree of deviation is measured by the preset large threshold and small ...

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Abstract

The invention relates to a method for automatic exposure compensation of backlit scenes in a video imaging system. The method includes the steps: a, acquiring required images, inputting the images into an image statistic device, and outputting a brightness average value Yave, a brightness deviation Ystd and an underexposure pixel percentage Punder after statistics of the image statistic device; b, computing to obtain a judgment reference value Yref satisfying the equation that Yref=Ystd / Yave, and comparing the judgment reference value Yref with a preset upper threshold and a preset lower threshold so as to judge scene states of the acquired images of an image acquirer; and c, when the acquired images of the image acquirer are backlit scenes, computing exposure target values of the images according to the underexposure pixel percentage Punder, performing exposure compensation for the images according to the exposure target values and enabling the image acquirer to perform normal scene exposure image acquisition under the exposure target values, and otherwise, enabling the image acquirer to perform normal scene image acquisition. The method is simple and convenient to operate, capable of improving effectiveness and stability of exposure compensation and wide in application range.

Description

technical field [0001] The invention relates to an exposure compensation method, in particular to an automatic exposure compensation method for a backlit scene in a video imaging system, and belongs to the technical field of image processing. Background technique [0002] In video imaging systems, traditional automatic exposure control (AEC) uses the average brightness of the image to compare with a static exposure reference value. But this "grayscale world assumption" can lead to underexposure in certain types of lighting conditions, such as foreground objects in backlit situations. Shooting this kind of scene usually results in abnormal exposure where the background is too bright and the subject is dark. [0003] In order to avoid this problem, some cameras are equipped with a backlight compensation mode, which allows the user to choose whether the scene is backlit or not, and whether to manually activate the backlight compensation function. But this manual operation may...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235H04N5/243H04N23/76
Inventor 栗兆剑
Owner 无锡鸿图微电子技术有限公司
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