Automatic Exposure Method Based on Color Weighting

An automatic exposure and color technology, applied in the field of digital imaging, can solve problems such as color distortion, and achieve the effect of appropriate brightness and accurate exposure

Inactive Publication Date: 2017-12-12
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an automatic exposure method based on color weighting, which solves the problem of color distortion caused by exposure when a certain color is dominant in the scene, and obtains more vivid colors while obtaining appropriate brightness

Method used

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  • Automatic Exposure Method Based on Color Weighting
  • Automatic Exposure Method Based on Color Weighting
  • Automatic Exposure Method Based on Color Weighting

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Experimental program
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Embodiment 1

[0079] combine image 3 and Figure 4 , the target image number of digits is 8bit, the brightness threshold Yth=133, the brightness low threshold YL=107, the brightness high threshold YH=148, the color threshold Cth=46, and the adjustment threshold Fth=0.7. Collect data for scenes dominated by large lawns, image 3 For the image obtained by adopting the automatic exposure method based on color weighting of the present invention, the image color is true and the exposure is accurate. Figure 4 For the image obtained by the ordinary automatic exposure method, because the average brightness of the image is lower than the low threshold, the system increases the exposure, making the picture too bright and the color distorted.

[0080] Therefore, the automatic exposure method based on color weighting in the present invention solves the problem of color distortion caused by exposure when a certain color is dominant in the scene, obtains more vivid colors while obtaining appropriate ...

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Abstract

The invention discloses an automatic exposure method based on color weighting, which is used to realize the automatic exposure of images and improve the display effect of images. The invention extracts color feature values ​​from collected image data, and utilizes the color feature values ​​in different The weights compute the brightness index of the image. According to the image brightness index, it is judged whether the image is in the optimal brightness range, if not, the exposure parameters are adjusted according to the adaptive adjustment step length, and an image with accurate exposure is obtained. The present invention obtains exposure images with proper brightness and brighter colors for most scenes, and in scenes where a certain color dominates, the colors can be truly restored and accurate exposure can be obtained.

Description

technical field [0001] The invention relates to the field of digital imaging, in particular to an automatic exposure method based on color weighting. Background technique [0002] With the rapid popularization of high-resolution cameras, users have higher and higher requirements for image quality. Accurately controlling the exposure of the camera has also become one of the key parameters to improve the final image quality. The camera’s light metering system is designed according to the 18% reflectance of the subject. For most scenes, the reflectance of the light and dark parts can be considered as 18%. Using the exposure combination provided by the camera after metering, you can get 18% after the synthesis. % gray tone photo, this is the normal tone in most cases. In fact, there is a specific relationship between the exposure measured by the camera's metering system and the color of the subject. Different colors have different reflective degrees. When the shooting picture...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235
Inventor 隋修宝李晓帆颜奇欢钱毅涛陈钱顾国华钱惟贤何伟基于雪莲钱佳王晨尹春梅高航孙镱诚曾俊杰刘源
Owner NANJING UNIV OF SCI & TECH
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