A kind of automatic exposure control method of digital camera device

A technology of digital photography and automatic exposure, which is applied in image communication, TV, color TV parts, etc. It can solve the problems of not being able to meet the changes of multiple scenes, lack of consideration of sensor and lens characteristics, etc., and achieve simple calculation and realization Precise control, effects that improve camera quality

Active Publication Date: 2016-02-24
山东岱微电子有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The existing automatic exposure control technology cannot meet the changes of multiple scenes in terms of accurate control, and the application range of the camera device is very large, and the existing automatic exposure control algorithm is mostly based on the difference between the target brightness and the current brightness. The adjustment direction and characteristics of EV are chosen according to the designer's preference, and the consideration of sensor and lens characteristics is lacking.

Method used

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  • A kind of automatic exposure control method of digital camera device
  • A kind of automatic exposure control method of digital camera device

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Experimental program
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Embodiment Construction

[0032] like figure 2 Shown, the steps of the present invention are as follows:

[0033] 1): Select the weight model of the block statistical brightness corresponding to the camera application scene mode (sports, surveillance, center photo, etc.). Corresponding to different scenarios, there are many weight models, which can also be designed and extended. The present invention generally recommends the following types (but not limited to):

[0034] 0,0,0,0,0,0,0,0,

[0035] 0,0,0,1,1,0,0,0,

[0036] 0,0,1,3,3,1,0,0,

[0037] 0,0,1,3,3,1,0,0,

[0038] 0,0,0,1,1,0,0,0,

[0039] 0,0,0,0,0,0,0,0,

[0040] (1)

[0041] 1,1,1,1,1,1,1,1,

[0042] 1,1,1,1,1,1,1,1,

[0043] 1,1,1,1,1,1,1,1,

[0044] 1,1,1,1,1,1,1,1,

[0045] 1,1,1,1,1,1,1,1,

[0046] 1,1,1,1,1,1,1,1,

[0047] (2)

[0048] 1,1,1,1,1,1,1,1,

[0049] 1,1,1,2,2,1,1,1,

[0050] 1,1,2,2,2,2,1,1,

[0051] 2,3,4,4,4,4,3,2,

[0052] 3,4,5,6,6,5,4,3,

[0053] 3,4,5,6,6,5,4,3,

[0054] (3)

[0055] 2) When sta...

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Abstract

The invention discloses an automatic exposure control method for a digital camera device, which selects a block statistical brightness weight model corresponding to a camera application scene of the digital camera device, a target brightness of a target frame image of the camera application scene, and an exposure curve corresponding to the camera application scene , calculate the brightness of the current image in blocks, and then calculate the average brightness of the entire image, determine the ambient light metering compensation coefficient according to the average brightness, and use the difference DeltaBv between the current frame image brightness and the target brightness as the adjustment condition to determine the next frame The exposure time and aperture value of the exposure. According to different scenes and different acquisition targets, the present invention adaptively adjusts different weight coefficients to estimate image brightness, which can better represent the camera scene in practical applications; Calculation, to achieve precise control of automatic exposure, can effectively improve the quality of the camera.

Description

technical field [0001] The invention relates to an automatic exposure control method of a digital camera. Background technique [0002] Automatic exposure affects the basic brightness information of the image and video captured by the camera device, which is an important performance index slightly inferior to the resolution. Therefore, the research on automatic exposure control methods has important practical significance and market value. [0003] The brightness of the image video captured by the camera device is mainly determined by the following factors: the simulation of the sensor (sensor) hardware, the amplification factor of the digital circuit, the luminous flux captured by the sensor, and the exposure duration. A simple quantitative formula can be described as follows: [0004] Ev=Av+Tv=Bv+Sv–Cv (1) [0005] Among them, Av represents the influence of the aperture of the camera device on the image, and Tv represents the shutter speed, that is, the exposure time. B...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235
Inventor 张葵阳
Owner 山东岱微电子有限公司
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