Histogram equalization based image enhancement method and device

A histogram equalization and image enhancement technology, applied in image enhancement, image data processing, instruments, etc., can solve the problems of low image quality and loss

Active Publication Date: 2010-05-12
VIMICRO ELECTRONICS CORP
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  • Abstract
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Problems solved by technology

[0004] However, for the entire frame image, the edge area and detail area that contains rich gray value changes may be lost due to the gray value balance of the entire frame image, so that the enhanced image quality is not high.

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  • Histogram equalization based image enhancement method and device
  • Histogram equalization based image enhancement method and device
  • Histogram equalization based image enhancement method and device

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Embodiment Construction

[0067] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0068] In the embodiment of the present invention, the histogram equalization is performed on the entire frame input image in sub-regions instead of the entire frame image. If the pixels in the area are too concentrated in some grayscale intervals, the layering of the image will be relatively low. Poor, the expressiveness of the edge detail information of the image is not high, so, by performing histogram equalization on this area alone, the sense of layering in this area will be enhanced, and the edge and detail information with rich gray value changes can be improved. expressiveness.

[0069] Of course, since only the gray value of the pixels in the region is considered when performing histogram equalization in each region, it is easy to produce obvio...

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Abstract

The invention discloses a histogram equalization based image enhancement method and device. In the invention, the whole-frame input images are subjected to histogram equalization by sectors; therefore, by carrying out histogram equalization on the sector singly, the layering in the sector can be enhanced and the expressive forces of the edges which are rich in changes of gray values and the detailed information can be improved. Hereafter, interpolation processing is carried out on the pixel gray values of the edges of each sector and the adjacent sectors around the sector so that the sectors are related to avoid obvious boundaries among the sectors as each sector is respectively subjected to histogram equalization, thus improving the quality of the enhanced images. In addition, the detailed information of the edges is further enhanced by adjusting the local contrast of the enhanced input images so as to improve the contrast of the images after equalization, thus further improving the quality of the enhanced images.

Description

technical field [0001] The present invention relates to image enhancement technology, in particular to an image enhancement method based on histogram equalization and an image enhancement device based on histogram equalization. Background technique [0002] Image enhancement is the most basic means of image processing, and it is usually the preprocessing process of various image analysis and processing. Image enhancement methods are generally divided into two categories: spatial domain and transform domain. Histogram equalization is one of the most commonly used and important algorithms in spatial domain image enhancement. [0003] Based on probability theory, histogram equalization converts the entire frame of images with pixels of different gray values ​​into a histogram of pixel statistics of different gray values ​​in the entire frame of images, and then through the histogram Equalization processing is used to correct the pixel gray value in the whole frame image, so th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/40G06T5/20
Inventor 卢晓鹏
Owner VIMICRO ELECTRONICS CORP
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