Method and system for filtering image data

Abstract

The invention provides a method and a system for filtering image data. The distinguishing method comprises the following steps: sequentially selecting each pixel point in a plurality of pixel points in the image data to be processed as a target pixel point; constructing a filtering window by taking the target pixel point as a center, and performing vector addition on each phase in a plurality of phases in the filtering window to obtain a sum vector of the plurality of phases; calculating a phase angle difference between any two phases in the plurality of phases in the filtering window to obtain a plurality of phase angle differences and determine a median of the plurality of phase angle differences; determining a weight value for each phase angle difference, associating each normalized weight value with a corresponding pixel point in the filtering window, and calculating a weighted sum; and adding the weighted sum and the phase principal value of the sum vector to determine a filtering parameter of the target pixel point, and determining a filtering result of the target pixel point based on a comparison result of the filtering parameter of the target pixel point and a filtering threshold.

Description

technical field [0001] The present invention relates to the technical field of image processing, and more specifically, to a method and system for filtering image data. Background technique [0002] An optical image is an image obtained by an optical photography system with a photosensitive film as the medium, and usually refers to the image data obtained by sensors in the visible light and some infrared bands. A SAR image is an image generated by a Synthetic Aperture Radar (SAR, Synthetic ApertureRadar) system. The SAR system is an active earth observation system that can be installed on aircraft, satellites, spacecraft and other flight platforms, and can observe the earth all day and all weather, and has a certain surface penetration capability. [0003] Optical images usually contain grayscale information of multiple bands to facilitate target identification and classification extraction. The SAR image only records the echo information of one band, which is recorded in ...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the general optical filtering algorithm cannot well preserve the characteristics of the interference phase, some useful information will be filtered out, and the edge information details of the picture cannot be well preserved. The present invention uses the periodicity of the circle, Effectively preserves phase information

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