Histogram equalization method for maintaining background and detail information

A technology of histogram equalization and detail information, applied in image enhancement, image data processing, instruments, etc., can solve the problems of brightness transition, average brightness drift, and image visual effect decline.

Inactive Publication Date: 2014-02-26
TIANJIN UNIV
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Problems solved by technology

These phenomena will cause unnatural transition of brightness while the contrast of the image is improved, a large amount of noise will be enhanced unnecessarily, the visual effect of the image will decrease, the average brightness will drift, and the image will be distorted.
When local histogram equalization is used, the checkerboard effect of the image is too obvious, which affects the aesthetics of the overall image
This effect cannot be completely eliminated, especially at the edges
In addition, multiple histogram statistics also increase the amount of calculation
Although the histogram equalization method of dynamic range ...

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  • Histogram equalization method for maintaining background and detail information
  • Histogram equalization method for maintaining background and detail information

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Embodiment Construction

[0036] In order to solve the above-mentioned problems, the present invention adopts a histogram statistical calculation method that counts local neighborhood information when calculating the histogram of the image, and generates an optimized histogram; at the same time, the parameters are set to adjust the degree of contrast enhancement; Before the graph equalization, the generated optimized histogram is divided by a certain value, and then the histogram equalization operation is performed separately. figure 1 It is a flowchart of a method for equalizing a histogram of the present invention. The following will introduce the specific method of each step.

[0037] The present invention first performs the statistics of neighborhood information on the input image, calculates the gray value of each pixel value of the input image and the surrounding pixel values ​​and its relationship, and generates a two-dimensional optimized histogram.

[0038] In the process of neighborhood informati...

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Abstract

The invention relates to the field of digital image processing, and aims at enhancing digital image contrast ratio and weakening unfavorable influence on image quality caused by an over-enhancement effect, a halo effect and average brightness drifting. Therefore, the technical scheme adopted by the invention is a histogram equalization method for maintaining background and detail information. A histogram statistics calculation method for performing statistics on local neighborhood information is adopted so that an optimized histogram is generated. Meanwhile, degree of enhancement of the parameter adjustment contrast ratio is set. Before equalization of the histogram, a certain value of the optimized histogram is taken to perform segmentation, and then histogram equalization operation is performed respectively. The histogram equalization method is mainly applied to digital image processing.

Description

Technical field [0001] The present invention relates to the field of digital image processing, in particular to the contrast enhancement of grayscale images in image enhancement, histogram processing and subsequent image information extraction and display. Specifically, it relates to a histogram equalization method for maintaining background and detail information. Background technique [0002] Digital image enhancement technology is an important aspect in image processing. Image enhancement can effectively highlight the features of interest in the image, weaken the secondary information, and can purposefully emphasize the overall and local information of the image. For distorted images, useful information in the image can be effectively restored; for images used on some special occasions, important details can be extracted. Therefore, image enhancement can reflect its important role no matter in military, aviation, geographic and commercial purposes, or in the extraction and cl...

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Application Information

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IPC IPC(8): G06T5/40G06T5/00
Inventor 史再峰徐艳姚素英徐江涛高静
Owner TIANJIN UNIV
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