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Color digital image enhancing and denoising method under random illumination

A digital image and image technology, which is applied in the field of color digital image enhancement and denoising, can solve problems such as flat color, and achieve the effect of less texture and detail information, good contrast, and remarkable image details

Active Publication Date: 2011-07-20
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is similar to the bilateral filtering technique with edge-preserving characteristics. The enhanced image can retain more detailed information, but the color is relatively flat.

Method used

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  • Color digital image enhancing and denoising method under random illumination
  • Color digital image enhancing and denoising method under random illumination
  • Color digital image enhancing and denoising method under random illumination

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Embodiment Construction

[0033] The technical scheme of the present invention is as figure 1 : First, the original RGB digital image is converted to other color spaces, the image is enhanced in the HSI color space, and the image is denoised in the YCbCr space. According to the characteristics of different color spaces, the present invention uses two color spaces in combination to improve the processing effects of enhancement and denoising. In terms of image enhancement, the invention modifies the Retinex model algorithm, proposes an improved histogram algorithm, and provides a formula for enhancing saturation. In terms of image denoising, the present invention selects a combination of a Gaussian filter and a median filter for the characteristics of inherent noise under specific illumination.

[0034] 1. Color digital image enhancement process

[0035] The process of color digital image enhancement is as follows:

[0036] (1) Color digital image brightness enhancement process

[0037] (1) Compensatio...

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Abstract

The invention discloses a color digital image enhancing and denoising method under random illumination. The method is characterized by comprising the following steps of: 1, image denoising processing, namely converting an original image from an RGB space to a YCbCr space, removing a Gaussian noise by using a Gaussian filter and removing a salt and pepper noise by performing median filter; 2, image brightness / contract stretch processing, converting the image from the RGB space to an HSI space, decomposing the image by using a two-sided filter, processing by an improved Retinex model algorithm, and obtaining a new image saturation by performing saturation compensation; and 3, performing fusion display on the image acquired after denoising the YCbCr space and the image acquired by HSI space processing. By the method, the color constancy of the image can be kept, the dynamic range of the image can be improved well, and simultaneously noises of the image can be inhibited and removed with less texture and detail information loss.

Description

technical field [0001] The invention relates to a color digital image enhancement and denoising method under random illumination. Background technique [0002] So far, color digital image processing under arbitrary lighting conditions is still a difficult problem without a mature solution. Complex light conditions greatly increase the difficulty of color image processing, especially in the case of poor lighting environment, due to the lack of enough photons to reach the photosensitive element, the image quality is poor. For example, at night, even with a flash, it is impossible to touch distant natural scenes, let alone places where the use of flash is not allowed, such as museums. In addition, some inappropriate operations (such as improper exposure) during photography will also reduce the quality of the image. Low-light images have the characteristics of low dynamic range and high noise. These characteristics not only affect the visual sense, but also cause fatal obstacl...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T5/50
Inventor 林相波孙怡印文帅
Owner DALIAN UNIV OF TECH
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