Automatic exposure control method

A control method and automatic exposure technology, which is applied in the field of image exposure, can solve problems such as large difference between image brightness and target brightness, underexposure of target area, long adjustment time, etc., to achieve narrow adjustment steps, fast and stable automatic exposure control , to ensure the effect of robustness

Inactive Publication Date: 2019-04-02
深慧视(深圳)科技有限公司
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Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, the purpose of the present invention is to provide an automatic exposure control method, which is used to solve the problem of underexposure or overexposure of the target area when the noise signal is large and the contrast between the target object and the background is too large in the prior art. The adjustment time is too long and the difference between the image brightness and the target brightness is too large

Method used

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Embodiment 1

[0050] Such as figure 1 Shown, a kind of automatic exposure control method, comprises the following steps:

[0051] S1: Use binocular vision and active structured light source projection method for image acquisition, and obtain the last image of each acquisition;

[0052] Structured light is generally a specially coded light source, which can not only increase the texture information of the target, but also provide active lighting;

[0053] S2: Use the dynamic partition and dynamic weight coefficient adjustment method to divide the acquired image into a background area and a target area, determine the weight coefficient of each area according to the comparison of the average brightness of the two areas, and obtain the average brightness of the image, Such as figure 2 shown, including the following steps:

[0054]S2-1: divide the acquired image into M×N small block areas on average, and divide the small block areas into target area and background area according to their con...

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Abstract

The invention belongs to the technical field of image exposure, and relates to an automatic exposure control method. The automatic exposure control method comprises the steps of S1, carrying out imagecollected by using binocular vision and an active structural light source projection method, and obtaining the last image collected each time; S2, obtaining the average brightness of the image by using a dynamic partitioning and dynamic weight coefficient adjusting method; S3, judging whether the average brightness of the image is within a target brightness range or not, if so, not carrying out exposure compensation and terminating the automatic exposure control, otherwise, entering the step S4; and S4, obtaining the difference between the average brightness of the image and the target brightness, selecting the corresponding step size for exposure compensation according to the difference and returning back to the step S1. The automatic exposure control method soles the problems of great noise signal, insufficient or excessive exposure of a target area due to excessive contrast between the target object and the background, excessively long adjustment time and excessively great difference between the image brightness and the target brightness in the prior art.

Description

technical field [0001] The invention belongs to the technical field of image exposure, and in particular relates to an automatic exposure control method. Background technique [0002] Automatic exposure control is to control the exposure when shooting, and the exposure refers to the amount of luminous flux from the scene to the camera. High-quality images can only be obtained when the photosensitive device is properly exposed. The amount of exposure is determined by the aperture size of the camera, the exposure time and the signal gain. The aperture is a device that uses its light hole to control the intensity of light that reaches the photosensitive chip of the camera during exposure; the shutter uses the length of its opening time to control the time of light entering, and then controls the amount of light entering. Adjusting the size of the aperture is generally done manually or by using an adjustable lens with motor control. However, due to the limitations of our produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235
CPCH04N23/71H04N23/73H04N23/70
Inventor 吕聪奕郭会文杨山杉赖银萍程至强陈野安雨婷刘云辉
Owner 深慧视(深圳)科技有限公司
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