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A Retinex enhancement method of color image based on guiding filter

A color image, guided filtering technology, applied in the field of image processing, can solve problems such as poor visual effect and small dynamic range of images, and achieve obvious effects, improve image contrast and clarity, and improve image visual range and visual effects.

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a color image Retinex enhancement method based on guided filtering to solve the problems of small dynamic range and poor visual effect of the image

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  • A Retinex enhancement method of color image based on guiding filter
  • A Retinex enhancement method of color image based on guiding filter
  • A Retinex enhancement method of color image based on guiding filter

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Embodiment Construction

[0057] In order to make the technical solutions of the present invention clearer and clearer to those skilled in the art, the present invention will be further described in detail below in conjunction with the examples and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0058] Such as figure 1 As shown, the color image Retinex enhancement method based on guided filtering provided in this embodiment is based on Retinex theory and guided filtering, and adjusts the gray value of the color RGB image to be displayed within a specified gray scale range, including the following steps:

[0059] Step 1: Read the RGB color image and extract the three components R, G, and B of the color image;

[0060] Step 2: Logarithmic transformation of the R component to obtain the filtered image LR, the logarithm of the R component minus the logarithm of the LR and then exponential transformation;

[0061] Step 3: Calculate uint8 type DR image;

[006...

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Abstract

The invention discloses a Retinex enhancement method of a color image based on a guiding filter, and belongs to the technical field of image processing. The method comprises the steps of reading an RGB color image and extracting a component; performing R component logarithmic transformation to obtain the filtered image LR; calculating a DR image; calculating a histogram of the gray image DR; calculating h0 corresponding to p >= p 0; recording a gray value of H (i) > h0, and setting a stretching range; Finding out the position of the gray value on the image DR in turn, and recording the corresponding value from the image DR; Recording the gray value of H (i) <= h0, taking out the gray value, and searching for the position and value of the gray value in the image DR; Outputting an R component output image; The original color image RGB is changed into a new variable to output the color image. The invention relates to a histogram-limited color image enhancement method which combines guidefiltering and Retinex theory, which is mainly used for solving contrast and clarity difference caused by narrow dynamic range of image, improving image contrast and clarity, and improving image visualrange and visual effect.

Description

technical field [0001] The invention relates to a color image Retinex enhancement method, in particular to a color image Retinex enhancement method based on guided filtering, which belongs to the technical field of image processing. Background technique [0002] With the market popularization of consumer-level and industry-level image digital equipment, digital image processing technology is getting closer to people's production and life. In order to obtain high-quality image sequences or video data, people apply digital signal processing technology to image enhancement. Field; the traditional guided filtering algorithm adopts a local linear shift variable filtering process to collect local pixel difference information, so as to perform image edge-preserving and smoothing processing, and the enhanced image can be obtained by accumulating the difference between the original image and the output image; based on Retinex theory The purpose of the image enhancement algorithm is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T5/90
Inventor 王海峰章怡范鑫
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