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Four-rectangular-window-based spatial domain filtering method

A spatial filtering and rectangular window technology, applied in the field of image processing, can solve the problems of inaccurate estimation of the center point and heavy weight of the center pixel.

Inactive Publication Date: 2017-02-22
DALIAN MARITIME UNIVERSITY
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  • Abstract
  • Description
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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

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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 four-rectangular-window-based spatial domain filtering method. The method comprises the steps of reading an image of a coherent speckle multiplicative noise; setting the length and width of each rectangular window in four rectangular windows and the spacing between the two windows, wherein the four rectangular windows include a first rectangular window, a second rectangular window, a third rectangular window and a fourth rectangular window; rotating the four rectangular windows around a central point of a local area window in spatial domain filtering, and determining edge intensity mapping corresponding to pixel points in the local area window according to a mean value in each rectangular window in the four rectangular windows; calculating weight values of the pixel points except the central point in the local area window for the central point according to the edge intensity mapping; and determining estimated pixel point values of the local area window according to the weight values. According to the method, coherent speckles can be suppressed and the edge structure information is also kept.

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...

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Application Information

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Patent Type & Authority Applications(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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