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Local extremum and pixel value gradient based improved image enhancement method

A local extremum and image enhancement technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as halos

Inactive Publication Date: 2015-01-07
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The method of the present invention aims at the defects that existing edge-preserving filters may produce halos, etc., and proposes an improved filtering method, which can better separate the object edge contour and object surface texture in the image, and has better processing effect

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  • Local extremum and pixel value gradient based improved image enhancement method
  • Local extremum and pixel value gradient based improved image enhancement method
  • Local extremum and pixel value gradient based improved image enhancement method

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Embodiment Construction

[0025] An image edge-preserving filter method based on local extremum and pixel gradient of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] The invention is an improved method based on the bilateral filter method. Therefore, the traditional Gaussian low-pass filter method and the image edge-preserving filtering method of the bilateral filter are firstly described in detail.

[0027] For the convenience of discussion, only single-channel images are taken as an example here. Note that the size of the input image I is (b-a)×(d-c), on the two-dimensional plane area Ω:[a,b]×[c,d]. For any point s∈Ω in the image, define the point set composed of its neighborhood points as Q s . The pixel value of point s is I s , and remember that the pixel value of this point after the tth iteration is I s t . According to the above sign convention, the result obtained after Gauss spatial domain filter iterative calculation (t+1...

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Abstract

The invention discloses an image gradient and local extremum based image edge-preserving filter algorithm. According to the gradient value of pixel values of an image and the distribution information of local extremum points, the position of an edge in the image is judged. Because according to the algorithm disclosed by the invention, the position of an edge of an image is judged through the gradient of pixel values and the local extremum points of pixel values, the edge of the image can be determined more accurately. In the process of filtering noises and detail textures in the image, a filter reduces the influences on the edge of the image in the process of filtering according to the previous judgment, therefore, the filter can separate the contour of an object in the image from an original image.

Description

technical field [0001] The invention relates to the field of digital image processing, in particular to an improved image enhancement method based on local extreme point distribution and pixel value gradient. Background technique [0002] As a basic tool of image processing, edge preserving filter is the current basic image processing tool due to its wide range of applications. Its purpose is to filter out secondary information (such as noise, texture details, etc.) in the image according to actual needs, but retain important information (such as the edge of the object). Of course, depending on the actual problems faced, even if it is the same image, its important information and secondary information are not fixed. For example, when people want to remove the noise in the image to obtain a high-quality picture, the noise is filtered out as a secondary information; on the contrary, when people need to analyze the noise pattern in the image to infer the type of interference t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 高成英李招祺
Owner SUN YAT SEN UNIV