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A Spatial Filtering Method Based on Four Rectangular Windows

A technique of spatial filtering and rectangular window, applied in the field of image processing, which can solve the problems of heavy central pixel weight and imprecise estimated central point.

Inactive Publication Date: 2019-02-22
DALIAN MARITIME UNIVERSITY
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  • Description
  • Claims
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Problems solved by technology

This will lead to the same weight of the symmetrical direction of the center pixel regardless of whether the local window is close to the edge area, which will lead to inaccurate estimation of the value of the center point when performing speckle suppression near the edge area

Method used

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  • A Spatial Filtering Method Based on Four Rectangular Windows
  • A Spatial Filtering Method Based on Four Rectangular Windows
  • A Spatial Filtering Method Based on Four Rectangular Windows

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Embodiment Construction

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0042] figure 1 It is a flow chart of the spatial filtering method based on four rectangular windows in the present invention, such as figure 1 As shown, the method of this embodiment includes:

[0043] Step 101, read the image of coherent speckle noise;

[0044] Step 102, setting the length, width and distance between the two windows of each o...

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Abstract

The invention provides a spatial filtering method based on four rectangular windows, which includes: reading the image of coherent patch multiplicative noise; setting the length, width and spacing between the two windows of each rectangular window in the four rectangular windows. The four rectangular windows include a first rectangular window, a second rectangular window, a third rectangular window and a fourth rectangular window; the four rectangular windows rotate around the center point of the local window in spatial filtering, and according to the The mean value in each rectangular window determines the edge intensity mapping corresponding to the pixels in the local window; calculates the edge intensity mapping of the pixels in the local window except the center point to the center point based on the edge intensity mapping. Weight value; determine the estimated pixel value of the local window according to the weight value. The invention can suppress coherence spots while maintaining edge structure information.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of image processing, in particular to a spatial filtering method based on four rectangular windows. Background technique [0002] When the traditional Frost filter performs coherent speckle suppression, the weights of pixels symmetrical to the center point in the local window are the same, and the weights of pixels far away from the center point are small. In this way, no matter whether the local window is close to the edge area or not, the weight of the symmetrical direction of the center pixel will be the same, which will lead to inaccurate estimation of the value of the center point when performing speckle suppression near the edge area. Contents of the invention [0003] An embodiment of the present invention provides a four-rectangular-window-based spatial domain filtering method to overcome the above-mentioned technical problems. [0004] The present invention is based on t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
CPCG06T5/70
Inventor 史晓非王智罡张敏
Owner DALIAN MARITIME UNIVERSITY
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