Variable contrast enhancement method and device for wavelet domain positive and negative image fusion

An image fusion and wavelet domain technology, which is applied in image enhancement, image analysis, image data processing, etc., can solve the problems of fixed contrast and information volume, and can not be selectively adjusted, so as to reduce gray-scale merging, and the scheme is simple and effective , with the effect of flexibility

Pending Publication Date: 2021-07-13
JIANGSU UNIV OF TECH
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Problems solved by technology

Its algorithm is relatively simple to implement, but the contrast and information volume of an enhanced image are fixed, and selective adjustment cannot be performed.

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  • Variable contrast enhancement method and device for wavelet domain positive and negative image fusion
  • Variable contrast enhancement method and device for wavelet domain positive and negative image fusion
  • Variable contrast enhancement method and device for wavelet domain positive and negative image fusion

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[0039] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0040] figure 1 A flow chart showing a variable contrast enhancement method for positive and negative image fusion in the wavelet domain provided by an embodiment of the present invention, combined with figure 1 , the variable contrast enhancement method for fusion of positive and negative images in the wavelet domain provided by an embodiment of the present invention includes:

[0041] S1, using db series wavelet base db1 wavelet...

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Abstract

The invention provides a variable contrast enhancement method and device for wavelet domain positive and negative image fusion. The method comprises the steps: obtaining a histogram calculation formula, and calculating a histogram h (i), a probability p (i) and a cumulative probability cdfp (i) of an input image I. The histogram calculation formula is as follows: i is a wavelet coefficient level, h is the frequency of each wavelet coefficient level, and the cumulative probability cdfp (i) is the cumulative probability cdfp (i). X0 is an image wavelet coefficient upper limit, and k is an image wavelet coefficient variable; a wavelet coefficient conversion function is obtained, an adjustable parameter P1 is set, a new wavelet coefficient value corresponding to each wavelet coefficient of the input image I is calculated, the wavelet coefficient conversion function is f (i) = x0 + (xL-1-x0) * [P1 * p (i) + cdfp (i-1)], f (i) is the new wavelet coefficient value obtained after i wavelet coefficient conversion, P1 is the first adjustable parameter, and the value range of P1 is [0, 1]; and outputting a new enhanced image according to the new wavelet coefficient value corresponding to each wavelet coefficient.

Description

technical field [0001] The invention relates to the technical field of image contrast enhancement, in particular to a variable contrast enhancement method and device for fusion of positive and negative images in the wavelet domain. Background technique [0002] There are many image processing methods based on histogram technology, the most classic of which is the global histogram equalization method, which is one of the common methods of digital image enhancement. Its algorithm is relatively simple to implement, but the contrast and information volume of an enhanced image are fixed, and cannot be selectively adjusted. How to invent a histogram enhancement technology whose contrast and information content can be adjusted and selected has become an urgent problem to be solved. Contents of the invention [0003] The present invention aims to provide a variable contrast enhancement method and device for front and back image fusion in wavelet domain which overcomes one of the ...

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Application Information

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IPC IPC(8): G06T5/40
CPCG06T5/40G06T2207/20221
Inventor 章怡王海峰范鑫陈海忠吴卫华薛勇
Owner JIANGSU UNIV OF TECH
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