Synthetic aperture radar (SAR) image speckle suppression method by combining direction aggregation

Abstract

The invention discloses a synthetic aperture radar (SAR) image speckle suppression method by combining direction aggregation. By the method, the problem that detail information in the prior art may be lost. A speckle suppression process is that: (1) extracting an edge sketch, consisting of line segments, of an SAR image to describe strange information of the image by using a sparse encoding method in a Primal Sketch sparse representation model; (2) according to the edge sketch, dividing the SAR image into a uniform region and a non-uniform region; (3) processing the non-uniform region by the SAR image speckle suppression method by combining image structure direction information and aggregation; (4) processing the uniform region by a Lee filtering method in which the window is 5*5; and (5)combining the processed non-uniform region and the processed uniform region and obtaining a speckle suppression result of the SAR image. By the method, a good speckle suppression effect of the SAR image is achieved; furthermore, the detail information of the image is kept effectively; and the method is used for SAR image speckle suppression.

Description

technical field [0001] The invention belongs to the technical field of image processing, relates to a SAR image coherent speckle suppression method, and can be used for SAR image coherent speckle suppression. Background technique [0002] Synthetic Aperture Radar (SAR) is a high-resolution imaging radar, which belongs to the active remote sensing system. SAR is not affected by light, weather and other conditions, and has all-weather imaging capabilities. It has been widely used in surveying and mapping, resource and environment monitoring, geology, earthquake, volcano monitoring, marine, military and other fields. The SAR image is obtained through aperture synthesis to obtain a large radar antenna, and the electromagnetic wave emitted by the large antenna is backscattered by the target scattering element to form an image. In the imaging process of SAR, because it uses the coherent method to achieve aperture synthesis, it is often accompanied by the coherence phenomenon betw...

AI Technical Summary

Problems solved by technology

However, the above methods all use local statistical methods to estimate the central pixel, which cannot fully reflect the structural information of the image, which will lead to the loss of some detailed information to a large extent.

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