A camera automatic exposure and automatic gain adjustment method

Abstract

The invention discloses a camera automatic shutter and automatic gain (Auto Shutter and Auto Gain, 2A) adjustment method. The method comprises the following steps that: step 1, images shot by the camera and the operating parameters of the camera are obtained; step 2, the average brightness value of the images is determined based on one frame or a plurality frames of shot images; step 3, whether an automatic shutter and automatic gain adjustment function of the camera is started is judged based on the difference value of the average brightness value and a target brightness value; step 4, shutter adjustment or gain adjustment required to be carried out is calculated based on the difference value of the average brightness value and the target brightness value; step 5, automatic shutter and / or automatic gain adjustment is started according to a preset sequence; and step 6, adjusted shutter time or an adjusted gain value are updated and are outputted. According to the method of the invention, automatic shutter or automatic gain adjustment is selected according to the image acquisition mode of the camera and the scene requirement of a user, and 2A adjustment is performed continuously or for one time; the average brightness value of the images can stably achieve an expected value through setting different adjustment strategies, and bounce flash can be avoided.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a digital camera automatic exposure and automatic gain adjustment method. Background technique [0002] In the use of industrial cameras, due to the uncertainty of the ambient light source and the scene, the user generally requires the image brightness to operate within a certain range when using the camera, so it is necessary to set the gain and exposure time of the camera in order to achieve The desired brightness value. [0003] According to the different needs of users, the automatic exposure and automatic gain adjustment process of the camera is generally divided into two modes, continuous adjustment and single adjustment; in the continuous adjustment mode, the 2A (automatic exposure and automatic gain adjustment) function of the camera is consistent in continuous work , it can adjust the exposure and gain of the camera in real time according to the difference in the curren...

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