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Heat image detail enhancement method based on normal distribution adjustment

A normal distribution, image technology, applied in the field of infrared imaging, can solve the problem of unclear target and scene details in infrared images

Active Publication Date: 2014-11-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of unclear target and scene details of infrared images, and propose a thermal image detail enhancement method based on normal distribution adjustment

Method used

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  • Heat image detail enhancement method based on normal distribution adjustment
  • Heat image detail enhancement method based on normal distribution adjustment
  • Heat image detail enhancement method based on normal distribution adjustment

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Embodiment Construction

[0041] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0042] figure 1 It is a flow chart of the method of the present invention. This embodiment illustrates the application of the detail enhancement method based on normal distribution in the present invention by analyzing a high dynamic sunset scene acquired by a refrigerated 320×240 long-wavelength HgCdTe infrared detector. The processing process of the detail enhancement method based on normal distribution adjustment is as follows:

[0043] Step 1: Use the formulas (5) and (6) to separate the input original image through a bilateral filter to obtain the detail image I D .

[0044] Step 2: Use the formula (11) to adjust the gray distribution of the detail image using the normal distribution factor to obtain a new detail image I Ddh , I Ddh Contrast I D , the artifacts disappear obviously, and the intercepted 40×40 pixel area, the value distributio...

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Abstract

The invention relates to a heat image detail enhancement method based on normal distribution adjustment, and belongs to the technical field of infrared thermography. The method comprises the following steps: further adjustment is conducted on detail image gray level distribution separated by bilateral filter through a normal distribution function of average absolute difference; pseudomorphism is restricted; noise characteristics of the detail image are improved to obtain a new detail image; meanwhile, a platform histogram is utilized to compress an original image to obtain a basic image; scene detail information is retained; the detail image and the basic image are combined to form an output image. The processed noise characteristics of the detail image are improved remarkably; meanwhile, the processing retains the pseudomorphism; gray scale layer sense of the final output image is improved; the method can be used for various infrared focal plane imaging systems, provides effective infrared image detail enhancement technique means, and improves target detection, search and identification capacity.

Description

technical field [0001] The invention relates to a thermal image detail enhancement method based on normal distribution adjustment, which belongs to the technical field of infrared imaging. technical background [0002] Infrared images generally have the phenomenon that the target and scene details are not clear, which is a major problem restricting the quality of infrared imaging. In order to ensure that the thermal imaging system has a large dynamic range and temperature resolution, the analog output of the usual infrared focal plane detectors adopts AD sampling and quantization with 14bits or higher precision. 14bits data is compressed to 8bits or 10bits data. At present, linear (such as AGC) and nonlinear (γ transformation) enhancement and compression algorithms commonly used, because small objects or weak details occupy less pixels or gray levels, are often merged into other gray levels after the compression process And it is unified with the surrounding background, so...

Claims

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Application Information

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IPC IPC(8): G06T15/20G06F17/50
Inventor 金伟其金明磊李力王霞徐超
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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