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Enhancement method aiming at passive millimeter wave image

A technology of enhancement processing and millimeter wave imaging, applied in image enhancement, image data processing, instruments, etc., can solve problems such as poor image recovery ability, and achieve improved signal-to-noise ratio, good visual effect, high quality and resolution. Effect

Inactive Publication Date: 2011-05-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The main defect of compressive sensing technology lies in the mutual constraints between its solution method, reconstruction error and iteration times, and its poor recovery ability for images with large noise variance.

Method used

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  • Enhancement method aiming at passive millimeter wave image
  • Enhancement method aiming at passive millimeter wave image
  • Enhancement method aiming at passive millimeter wave image

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Embodiment Construction

[0027] A. First input the target scene image scanned by the 89GHz passive millimeter-wave imaging system into the computer (attached figure 1 is its scanned image);

[0028] B. Utilize contourlet to denoise the image: Utilize conventional contourlet technology to adopt Laplacian filter and direction filter to carry out low-pass and high-pass decomposition processing on the image obtained in step A respectively. The filter image is decomposed into 5 layers, and the corresponding contour wave coefficients of each layer are coef 1 、coef 2 ... coef 5 ;

[0029] The model of the Laplacian filter is a 9-7 wavelet filter, and the model of the directional filter is a pkva wavelet filter; at the same time, according to the classic formula:

[0030] σ = median ( | coef | ) 0.6745

[0031] Determine the noise standard d...

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Abstract

The invention belongs to an enhancement method aiming at a passive millimeter wave image. The method comprises the following steps of: extracting a scanning imaging image of a target scene; carrying out noise reduction processing on the image; and carrying out treatments for eliminating the false outline of the image, wherein the treatments for eliminating the false outline of the image includes the treatments of determining a point spread function graph by utilizing Gaussian model parameters, establishing a sampling matrix of the image subjected to noise reduction, sampling the image subjected to the noise reduction, and carrying out non-convex set adaptive threshold iteration. In the invention, because an contourlet and compressive sensing technology are organically combined to enhance the passive millimeter wave scanning image, the image resolution can be almost doubled, the signal to noise ratio is respectively improved by about 4dB and 1dB compared with conventional wavelet denoising processing and simple contourlet processing, and the improvement effect of the signal to noise ratio is better with the increase of the noise standard deviation, thus the method has the characteristics of easy target characteristic extraction, good robustness to noise, high quality and resolution of the millimeter wave image subjected to enhancment processing, good image visual effect and the like.

Description

technical field [0001] The invention belongs to the technical field of passive millimeter wave image processing, in particular to a method for enhancing processing of passive millimeter wave scanning imaging by using compressed sensing and contour wave (wavelet) technology. Background technique [0002] According to the theory of black body radiation, any object with a temperature higher than absolute zero will radiate electromagnetic waves of different intensities. The passive millimeter-wave scanning image realizes its imaging by using the difference in the radiation energy distribution of the scene and the target, and its imaging mechanism is similar to infrared and optical imaging. Passive millimeter wave imaging has its unique technical advantages. It can penetrate smoke, cloud, rain, fog and battlefield smoke, etc., and has the ability to work all day and all day; anti-masquerading capabilities. Because the passive millimeter wave is passively received signal imaging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 李良超熊金涛杨建宇韩波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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