Method for automatic exposure and automatic gain regulation and method thereof

An automatic gain adjustment and automatic exposure technology, which is applied to TV, color TV parts, electrical components, etc., can solve the problems of calculating the optimal exposure time, the slope of the linear change of image brightness with the exposure time, and inaccuracy. Achieve the effect of convenient adjustment, less input parameters, and guaranteed image quality

Active Publication Date: 2010-05-19
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

[0017] However, for different light sources or different objects, the slope of the linear change of image brightness with exposure time is different
Therefore, it is not accurate to calculate the optimal exposure time based on the average brightness of the entire image.

Method used

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  • Method for automatic exposure and automatic gain regulation and method thereof
  • Method for automatic exposure and automatic gain regulation and method thereof
  • Method for automatic exposure and automatic gain regulation and method thereof

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Embodiment Construction

[0044] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention should not be limited thereby.

[0045] see figure 1 with figure 2 .

[0046] figure 2 It is a flowchart of the automatic exposure and automatic gain adjustment method of the present invention. The method of the present invention directly calculates the optimal exposure time and the gain value according to the linear relationship between the imaging brightness of each region of the image and the exposure time, and the steps are as follows:

[0047] 1. First, the image processing module divides the input image into N*N sub-image areas, such as 8*8 areas, and calculates the average imaging brightness L of each area img_i , i=1~N*N.

[0048] 2. The image processing module takes the average imaging brightness L of each area img_iDivide by the current exposure time T and the current g...

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Abstract

The invention discloses a adjusting method for automatic exposure and automatic gain, which includes the following steps: (1) dividing an input image into N*N sub-areas and calculating the average imaging brightness of each area; (2) obtaining the actual brightness of each area; (3) calculating the optimal exposure time of the area; (4) obtaining the optimal exposure time; (5) pre-detecting the imaging brightness value of each area under the exposure time; (6) calculating the optimal gain value; (7) setting the imaging time and gain of an imaging sensor, shooting the image of next frame and repeating the steps until target exposure brightness is achieved. An adjusting device for applying the method for automatic exposure and automatic gain includes an imaging sensor, an image processing module, an automatic exposure calculating module, an automatic gain calculating module and an imaging control module. The invention can rapidly adjust the exposure time and the gain value.

Description

technical field [0001] The invention relates to automatic exposure (Auto Exposure-AE) and automatic gain control (Auto Gain Control-AGC) in the field of digital imaging, in particular to an automatic exposure and automatic gain control method and a device thereof. Background technique [0002] AE and AGC are two very important and closely related modules in the field of digital imaging. Its main function is to control the brightness of the output image by adjusting the exposure time and gain of the imaging sensor. [0003] AE and AGC have a great influence on the quality of the output image. It is generally hoped that the details of the dark part of the image will not be lost, the bright part will not be exposed, and the average brightness is suitable for human eyes. In digital camera preview mode, lighting conditions can vary widely as the camera is moved. Therefore, AE and AGC need to be able to adjust quickly and in real time. [0004] Traditional AE and AGC methods u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235H04N5/243
Inventor 冯晓光罗小伟林福辉
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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