Method of automatic exposure regulation and its control system

Abstract

The present invention relates to an automatic exposure regulation method and its control system. Said method mainly includes the following steps: setting exposure control basic parameters including target luminance standard value Ytarget, luminance threshold value Ythd, luminance gain value Gtarget, and luminance gain value threshold value, making exposure, extracting image and making image processing, reading exposure time T1, luminance gain G1 and image exposure intensity statistical value Y1, judging exposure intensity value, calculating optimum exposure time T2 and using it to regulate exposure time T1 of image data input module.

Description

technical field [0001] The invention relates to a method and control system for automatic exposure adjustment, in particular to a method and control system for automatic exposure adjustment applied to film or digital photosensitive components (CCD, CMOS, etc.). Background technique [0002] Exposure is the process of film or digital photosensitive components (CCD, CMOS, etc.) receiving light from the lens to form an image. The exposure time is the time during which the photosensitive member receives light. Under the same environment (conditions such as light intensity do not change), the longer the exposure time, the brighter the image; conversely, the shorter the exposure time, the darker the image. If the scene in the image is too bright and there is no layer or detail in the bright part, it is overexposed; if the photo is dark and cannot truly reflect the color of the scene, it is underexposed. Therefore, when the environment changes, the exposure time should be adjuste...

AI Technical Summary

Problems solved by technology

[0027] As mentioned above, in indoor conditions, the exposure time setting must be an integer multiple of the indoor light source change period T to avoid flicker phenomenon, which causes another problem: the discontinuity of exposure time setting

[0029] In the past, because the mathematical relationship between the exposure degree and the exposure time was not found, the method of approximation and fitting could only be used, that is, to increase or decrease the exposure time and brightness gain a little bit to approach the theoretical value. The efficiency of this method is obviously very low.

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