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A local image contrast enhancement method to improve the perceptibility of image information

A technology of local contrast and image information, applied in image enhancement, image data processing, instruments, etc., can solve problems such as inability to fidelity information, image distortion, and unfavorable information clearly visible to the human eye.

Active Publication Date: 2018-06-19
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] To sum up, none of the existing image local contrast enhancement methods can achieve information fidelity in the local image, causing image distortion. Even if the enhancement method can achieve image local information fidelity to a certain extent, its The enhancement strategy adopted is also not conducive to all the information in the image being seen by the human eye.

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  • A local image contrast enhancement method to improve the perceptibility of image information
  • A local image contrast enhancement method to improve the perceptibility of image information
  • A local image contrast enhancement method to improve the perceptibility of image information

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Embodiment Construction

[0055] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0056] Firstly, it introduces the measurement method of human eye perceptibility for gray scale relationship, then the implementation of human eye perceptual fidelity constraints of image local information, and finally the contrast enhancement algorithm.

[0057] When the grayscale values ​​between pixels are equal, the human eye can always easily perceive the equal relationship; when the grayscale values ​​between pixels are not equal, the small grayscale difference will make it difficult for the human eye to perceive the greater than or less than relationship. The human eye perceptibility of the greater than and less than relationship of the gray value between pixels is determined by the human perceptibility of the gray value difference between pixels. The easier it is for the human eye to perceive the change in the gray value between pixels...

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Abstract

The invention discloses an image local contrast enhancement method for improving the perceptibility of image information, which enables all information in an image to be clearly perceived by human eyes as much as possible on the premise of retaining image local information. Retaining image local information is realized by ensuring that the gray scale relation between each pixel and pixels around the pixel within a certain range can be perceived by human eyes. Under the fidelity constraint, the human eye perceptibility of the gray scale relation between all adjacent pixels of which the gray scale difference is not 0 in the image is synchronously widened from 0; when the human eye perceptibility of the gray scale relation between part of adjacent pixels cannot be further widened, the perceptibility of the gray scale relation between the remaining adjacent pixels is continuously widened, till the human eye perceptibility of the gray scale relation between all the adjacent pixels is widened to a set perceptibility threshold or cannot be further widened. The method can be used for enhancing low contrast images caused by various reasons.

Description

technical field [0001] The invention belongs to the technical field of image contrast enhancement, and specifically relates to an image local contrast enhancement method for improving the perceptibility of image information. Background technique [0002] Poor imaging conditions such as smog or unreasonable settings of imaging parameters such as exposure time will cause the image contrast to be too low, making it difficult for the human eye to see the scene in the image clearly. The image enhancement method can make the originally invisible scene in the image clear to human eyes by increasing the image contrast. [0003] Existing image enhancement methods can be roughly divided into two categories: global contrast enhancement methods and local contrast enhancement methods. The global contrast enhancement method obtains the enhanced image through grayscale mapping, which has the characteristics of simple and fast operation. Representative image enhancement methods are: linear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/20G06T5/00
Inventor 朱枫蔡铁峰郝颖明吴清潇付双飞周静欧锦军
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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