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Self-adaptation equalization method based on extensible segmentation histogram

A histogram equalization and adaptive equalization technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as degradation, over-enhancement of bright areas, under-enhancement of dark areas of images, etc.

Active Publication Date: 2015-05-20
HUNAN UNIV
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Problems solved by technology

[0003] The present invention provides an adaptive equalization method based on scalable segmented histograms, and its purpose is to solve the problem of under-enhancement in dark areas of images and over-enhancement or severe seriousness in bright areas in the process of enhancing dark images in existing methods. problems such as degradation

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  • Self-adaptation equalization method based on extensible segmentation histogram
  • Self-adaptation equalization method based on extensible segmentation histogram
  • Self-adaptation equalization method based on extensible segmentation histogram

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] A method based on scalable segment adaptive histogram equalization, comprising the following steps:

[0034] Step 1: Extend the original input histogram using the scalable histogram segmentation method;

[0035] First, the original histogram H o Split into N non-overlapping segmented histograms h k , k∈[1,N]; then all segmented histograms h k respectively extended to the original histogram H o Histogram with the same grayscale interval, keep the segmented histogram h k The position of the original histogram remains unchanged, and the other positions are filled with zeros, that is, the extended segmented histogram is obtained (k∈[1,N]), H k x = [ 0 , . . . , h k , ...

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Abstract

The invention discloses a self-adaptation equalization method based on an extensible segmentation histogram. The self-adaptation equalization method comprises the following steps that firstly, an input original histogram is extended through an extensible histogram segmentation method; secondly, equalization is carried out on the extended histogram, and each equalized sub-histogram has the length same as that of the original histogram; thirdly, weighting mixture is carried out on the equalized sub-histograms obtained in the second step to obtain a final equalized histogram Ht (i). According to the method, an extensible histogram segmentation strategy is adopted, the image gray level obtained after equalization can be distributed to a large dynamic range again, and sufficient enhancement on the image in the dark area is facilitated; the self-adaptation histogram equalization method is adopted, the gray level uniform distribution degree is controlled according to the image gray level attribute in a self-adaptation mode, and accordingly excessive enhancement, insufficient enhancement and an unnatural halo phenomenon of the image can be avoided; according to the whole method, the calculation speed is high, and an image with the obvious enhanced effect is obtained.

Description

technical field [0001] The invention relates to an adaptive equalization method based on scalable segmented histograms. Background technique [0002] Histogram equalization (HE) has been widely used in traffic monitoring, medical image processing and other fields due to its simple principle and fast calculation speed. HE achieves contrast enhancement by distributing high dynamic range gray levels to a uniform distribution to increase the difference between adjacent gray levels. However, if there are multiple peaks in the histogram, over-enhancement, under-enhancement, and unnatural halos will occur; in order to avoid the above problems, adaptive local histogram equalization (ALHE), contrast Methods such as contrast-limited adaptive histogram equalization (CLAHE) first divide the image into multiple small windows, and perform histogram equalization in the small windows respectively; but due to the lack of global information, these methods are often over- or Checkerboard phe...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/40
Inventor 凌志刚王耀南瞿亮卢笑唐宇
Owner HUNAN UNIV
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