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Automatic exposure regulating method and device

A technology of automatic exposure and adjustment methods, which is applied in the control of exposure, optics, television, etc., and can solve the problems of slow exposure adjustment speed and inability to lock.

Inactive Publication Date: 2009-02-04
VIMICRO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the exposure adjustment speed is slow or it is easy to fail to lock due to the use of a fixed adjustment step

Method used

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  • Automatic exposure regulating method and device

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Embodiment Construction

[0018] refer to figure 2 , figure 2 A flow chart of an automatic exposure adjustment method according to a specific embodiment of the present invention is shown. To realize the automatic exposure adjustment process, it is first judged whether exposure adjustment is required. In step S21, the average luminance Ymean of the current image is obtained, where the "average luminance" includes weighted average luminance with different weights; in step S22, it is judged whether the current image is in the locked state, if it is in the locked state, automatic exposure adjustment is not required . This judging process is the same as the locking judging in the method of adopting a fixed adjustment step size.

[0019] refer to figure 1 , figure 1 It is a schematic diagram for judging whether the current image is locked. Among them, Ytarget represents the brightness of the target image; Ylock represents the locked range of automatic exposure; Yunlock represents the unlocked range o...

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Abstract

This invention discloses a kind of automatic exposure accommodation method and device. The stated method includes the following steps: judge whether the current image is on the locking condition, if the current image isn't on the locking condition, confirms the exposure time and the digit gain's regulation step according to the current image's Yean's and Ytarget's difference, adjusts the exposure time and the digit gain according to the stated regulation step. This invention adopts variable regulation step, this resolves the low exposure regulation speed or the unable locking condition which are caused by the adopt fixation regulation step.

Description

technical field [0001] The invention relates to the field of image processing of camera devices, in particular to an automatic exposure adjustment method and device. Background technique [0002] On the premise that the ambient brightness remains constant, the longer the exposure time of the image sensor in the camera device, the brighter the image; conversely, the shorter the exposure time, the darker the image. In the case of fixed exposure time, the larger the digital gain, the brighter the image; the smaller the digital gain, the darker the image. If the scene in the image is too bright and there is no level or detail in the bright part, it is overexposed; if the image is dark and cannot truly reflect the color of the scene, it is underexposed. Therefore, when the ambient brightness changes, the exposure time needs to be adjusted accordingly to avoid overexposure in a bright environment or underexposure in a dark environment. [0003] In the process of adjusting the ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B7/08H04N5/232
Inventor 李昕彤孙余顺
Owner VIMICRO CORP
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