Post-processing method based on Retinex image exposure compensation

A technology of exposure compensation and processing method, applied in image communication, parts of color TV, parts of TV system, etc., can solve problems such as over-brightness, and achieve the effect of maintaining realism and improving visual quality

Inactive Publication Date: 2006-11-01
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
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Problems solved by technology

Images in shadows often appear

Method used

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[0012] The first half of the method of the present invention is a traditional Multiscale-Retinex processing method. After the Retinex processing result is obtained, the processing result and the original image are weighted and averaged, and the weighted average result is output as the final result.

[0013] I out =wI original +(1-w)I retinex

[0014] The weight w determines the visual effect of the final processed image. The value range of w can be set according to needs, for example, 0.4-0.6; experiments show that when w=0.5, the final processed image effect obtained is better.

[0015] The advantage of linear weighted average processing is: firstly, the processing effect is guaranteed, and the "over-processing" (that is, the shadow part is processed too brightly) caused by the parameter setting can be corrected back. Secondly, the visual naturalness of the output result is guaranteed, the shadow part still maintains its dark characteristics, and the details of the dark ...

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Abstract

The invention is concerned with the post-processing technology of the digital camera shooting image, especially the post-processing method of the image exposal compensation based on the Retinex. The first half-part is the traditional Multiscale-Retinex processing method, make the weighted average of the processing result and the original image after getting the Retinex processing result, the result of the weighted average as the final result and make the weighted average with the original image, the result of the weighted average is as the final result output: Iout=wIoriginal+(1-w)Iretinex;The W is 0.4-0.6. The invention can achieve that need not the complicated parameter adjustment and satisfy the right processing of different image, ensure the natural vision of the output that is more close to the actual scenery by the human eye.

Description

technical field [0001] The invention relates to a post-processing technology for images captured by a digital camera, in particular to a Retinex-based image exposure compensation post-processing method. Background technique [0002] Due to the limitation of the photosensitive range of the photosensitive element of a digital camera, in the case of a scene with a strong contrast between light and dark, no matter how the exposure parameters are adjusted, the entire image cannot be correctly exposed. If the dark part is exposed, the bright part will be overexposed; otherwise, the dark part will be underexposed: [0003] In the field of digital image processing, the Retinex image processing method is a commonly used method for processing such images. The Retinex-based processing method can effectively improve the brightness of the dark part, while ensuring that the bright part will not be overexposed. However, the processing results based on Retinex are very sensitive to the pa...

Claims

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Application Information

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IPC IPC(8): H04N5/243G06K9/00
Inventor 冯晓光林福辉
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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