Camera automatic exposure method and control device

Abstract

A camera automatic exposure method and a control device, the method comprising the following steps: a. obtaining the average brightness value of the current frame image; b. comparing the current frame image average brightness value with a preset average brightness value, if the current frame image If the average brightness value of the current frame image is within the allowable range of the preset average brightness value, maintain the exposure time in the current exposure setting and return to step a, otherwise continue; c. If the average brightness value of the current frame image is greater than the preset average brightness value within the allowable range, adjust the shortening of the exposure time to obtain the new exposure time in the exposure setting; if the average brightness value of the current frame image is less than the allowable range of the preset average brightness value, then adjust the lengthening of the exposure time to obtain the exposure setting a new exposure time; and e, setting the image sensor according to the new exposure time. The present invention can realize automatic exposure at low cost, simply and quickly.

Description

technical field [0001] The invention relates to a camera, in particular to a method for realizing the automatic exposure function of the camera. Background technique [0002] There are many types of existing cameras, and various types of image sensors are used, such as CCD and CMOS. Most of the cameras basically have an automatic exposure function, and there are many ways to realize the automatic exposure function, for example: some realize automatic exposure by changing the amount of light, and some realize automatic exposure by controlling the image sensor. The automatic exposure methods of existing cameras mainly contain the following types: [0003] Only adjusting the aperture to control the amount of light passing through the lens, because the brightness of different scenes varies greatly in reality, the general lens aperture cannot meet the automatic exposure of all scenes, even if there is a lens with a wide aperture range, its price is very expensive, and The contr...

AI Technical Summary

Problems solved by technology

The defect of this implementation method is that the reduction of the exposure time means that the light outside becomes brighter, and the digital brightness gain will amplify the noise. Therefore, when the external light becomes better, reset the digital brightness gain to the highest value under the new exposure time. Value, will introduce unnecessary noise, thereby reducing the quality of the image

[0006] It can be seen that the existing automatic exposure method of the camera is either costly, or the calculation is complicated, the automatic exposure takes a long time, or the image quality is reduced, so it is necessary to improve the existing technology

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