SAR image denoising method based on contour wave domain block hidden Markov model

A Hidden Markov and Contour Wave technology, applied in the field of image processing, can solve the problems of lack of spatial adaptability and blurred edges of SAR images, and achieve the effect of overcoming spatial adaptability.
CN101639934AActive Publication Date: 2010-02-03XIDIAN UNIV
0 Cites 20 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2010-02-03

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a SAR image denoising method based on a contour wave domain block hidden Markov model, belonging to the field of image processing, mainly solving the problem of space adaptability shortage, serious detail information loss and fuzzy edge of current method, and comprising the following steps: (1) carrying out logarithmic transformation and Contourlet decomposition; (2) carrying out Block HMM modeling and training on a Contourlet coefficient; (3) correcting the Contourlet coefficient by estimation parameters; (4) carrying out Contourlet inverse transformation and antilogarithm transformation to the corrected Contourlet coefficient in order to obtain a one-time denoising image; (5) denoising a difference value image to obtain a second-time denoising image; and (6) fusing the one-time denoising image and the second-time denoising image and rotating and translating the fused image to obtain and output a final denoising image. The SAR image denoising method improves the space adaptability, reduces the calculation complexity and increases the edge resolution of the denoised image.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of image processing, and in particular relates to a method for suppressing SAR image speckle noise, which can be used for denoising processing of SAR images, medical images and natural images. Background technique

[0002] Synthetic aperture radar (SAR) has all-weather and all-weather earth observation capabilities, and can also obtain information through the surface and vegetation, playing an increasingly important role in military, remote sensing and other fields. The existence of speckle noise in SAR images seriously affects the accuracy of subsequent automatic interpretation and scene understanding tasks. Therefore, the removal of speckle noise is very important to the subsequent processing of SAR images.

[0003] Speckle noise removal usually includes spatial filtering and transform domain methods. Spatial filtering such as Gamma-MAP to denoise SAR images can effectively reduce the influence of noise ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More