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Tech, for inhibiting radar imaging coherent spot

A coherent speckle suppression and radar image technology, which is applied in the field of image processing, can solve problems such as manual intervention and unsatisfactory noise reduction effects, and achieve the effects of image quality improvement, simple structure, and coherent speckle noise reduction

Inactive Publication Date: 2006-06-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

A more typical example is the wavelet transform soft threshold theory and method proposed by Donoho. This method is derived under the condition of additive Gaussian white noise, which can better preserve the detailed information of the image, but it needs manual intervention in practical applications.
In short, from multi-view processing, basic filtering method to the introduction of wavelet transform, etc., although the coherent speckle has been suppressed to a certain extent, the noise reduction effect is not ideal, and there are still some problems in edge features, target preservation and adaptability. There are deficiencies

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  • Tech, for inhibiting radar imaging coherent spot
  • Tech, for inhibiting radar imaging coherent spot
  • Tech, for inhibiting radar imaging coherent spot

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] Experimental data: Three polarimetric image data of the L-band Hong Kong area of ​​the space shuttle SIR-C radar are used, about 5.23 view, which is the image formed on October 4, 1994. A small area (pixel 250*250) is intercepted here, in which there are both islands and oceans. In the experiment, the dimensionality reduction process was carried out when the image was whitened, that is, only the two largest eigenvalues ​​and their corresponding eigenvectors were selected, and the size of the output matrix Z after whitening became 2*62500. Then the whitened data is processed by ICA. When the convergence condition is set to 0.00001, the algorithm converges after 7 iterations, and the unmixing matrix is ​​obtained. W = - 0.1242 -...

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Abstract

The invention offers radar image coherent macula restraining technique. It starts from statistical characterization that radar image and coherent macula noise are independent each other, and uses analysis method to separate coherent macula form radar image to realize radar image coherent macula restraining. The method can reduce coherent macula noise, improve image quality, keep higher effect at target signature, and solves the contradiction between coherent macula noise restraining and image edge characteristic keep. And the invention has the feature of simple structure and fast convergence rate.

Description

technical field [0001] The invention belongs to the field of image processing, and in particular relates to radar image coherent spot suppression technology. Background technique [0002] When the radar beam shines on a rough surface relative to the radar wavelength, the received echo signal is synthesized by electromagnetic waves reflected by many scatterers in a resolution unit. Due to the rough surface, in the resolution unit The distance between the scatterer and the receiver changes, so the received electromagnetic waves are correlated in frequency but not correlated in phase, so the echo signal is strong and sometimes weak. Radar images are formed by the correlation processing of continuous echo signals, so there are often large gray-level fluctuations between pixels in radar images, which visually present a similar grain The noise is called coherent speckle noise. [0003] Coherent speckle noise is equivalent to superimposing a non-Gaussian multiplicative noise on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/288G01S7/32G01S7/41G01S13/89
Inventor 皮亦鸣田金凤付毓生范录宏
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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