Histogram equalization based image enhancement method and device

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

Active Publication Date: 2015-07-01
VIMICRO ELECTRONICS CORP
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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

[0068] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0069] In the embodiment of the present invention, the histogram equalization is performed on the sub-regions of the entire frame of the input image, instead of the histogram equalization for the entire frame of the image. If the pixels in the region are too concentrated in some grayscale intervals, the layered sense of the image will be poorer. Poor, the expressiveness of the edge detail information of the image is not high, so by performing histogram equalization on the area alone, the sense of hierarchy in the area will be enhanced, and the edge and detail information with rich gray value changes can be improved. expressiveness.

[0070] Of course, since the histogram equalization of each area only considers the gray value of the pixels in th...

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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 often the preprocessing process in 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] Histogram equalization is based on probability theory, and converts the whole frame image composed of pixels with different gray values ​​into a histogram of the statistics of pixels with different gray values ​​in the whole frame image, and then compares the histogram through the paired histogram. Equalization processing is used to correct the gr...

Claims

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Application Information

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