Automatic exposure method based on objective area in image

A target area and automatic exposure technology, applied in image communication, color TV parts, TV system parts, etc., can solve the problems of loss of useful information, insufficient brightness of the license plate area, license plate recognition, and vehicle management difficulties. Achieve the effect of improving the signal-to-noise ratio, the effect is obvious, and preventing insufficient brightness or overexposure

Active Publication Date: 2008-08-20
VIMICRO ELECTRONICS CORP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Due to the difference in ambient light, the existing exposure settings for the whole image sometimes cannot obtain a license plate image with appropriate brightness. For example, at night, due to the influence of the environment and its own car lights, the brightness of the license plate area may b

Method used

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  • Automatic exposure method based on objective area in image
  • Automatic exposure method based on objective area in image
  • Automatic exposure method based on objective area in image

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Experimental program
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Embodiment Construction

[0040] The core idea of ​​the present invention is: set a target list, save the area positions and existence probabilities of targets detected in the current detection frame and previous detection frames; after performing target detection on the image of the current detection frame, update the target list, and The state of a detection frame and the target list determine the state and brightness value of the current detection frame, and perform automatic exposure adjustment on subsequent images according to the brightness value of the current detection frame. The state of the detected frame includes a target state or a non-target state.

[0041] When the system is initialized, set the basic parameters of exposure control, and set the initial state as the non-target state.

[0042] Exposure control basic parameters, including: initial exposure time T1, target brightness standard value Y target , brightness threshold Y thd , Brightness gain value G target , Brightness gain val...

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Abstract

The present invention discloses an automatic exposure method basing on the target area in the image. The method comprises the following procedures: executing target detecting to the image of the frame being detected currently to judge whether a target exists; confirming the brightness value of the frame being detected currently according to the brightness value of the target area in the currently detected frame and/or the detected frame beforehand; and executing automatic exposure adjusting to the subsequent image according to the brightness value of the currently detected frame. The method adopting the invention can lead to that the target area in the image has appropriate brightness information relative to the full figure background. The signal-to-noise ratio of the target area is increase. The insufficient brightness or over exposure in the target area can be prevented. The effect is especially evident in the target backlight or bright light condition.

Description

technical field [0001] The invention relates to an automatic exposure method in a digital camera device, in particular to an automatic exposure method according to a target area (interesting area) in an image. Background technique [0002] In the prior art, the automatic exposure method in the digital camera equipment performs automatic exposure adjustment by calculating the brightness value of the whole image, without taking into account the brightness of some important areas in the image, that is, the target area (such as the face area or the license plate area), so that After exposure, the target area in the image cannot achieve a good display effect. [0003] For example, in the image used for video surveillance or video conferencing, the face area is the target area in the image, which has higher display effect requirements. When the face is backlit or the face is illuminated by strong light, the existing full-image The method of exposure setting makes the brightness o...

Claims

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Application Information

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IPC IPC(8): H04N5/235H04N5/243G06K9/00
Inventor 王俊艳邓亚峰黄英王浩邱嵩俞青杨晓东邓中翰
Owner VIMICRO ELECTRONICS CORP
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