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Method and apparatus for correcting non-uniformity of infrared imaging based on combined space-time filtering

A non-uniformity correction and non-uniformity technology, applied in image enhancement, image data processing, instruments, etc., can solve the problems of "ghosting, slow convergence speed, target degradation, etc., and achieve the goal of avoiding ghosting and improving convergence speed Effect

Inactive Publication Date: 2015-10-28
XIDIAN UNIV
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Problems solved by technology

This algorithm can complete the correction of the gain and offset response coefficients, and is relatively effective in suppressing high-frequency noise in space, but it also has the phenomenon of target degradation and "ghosting", and because of its large amount of calculation and slow convergence speed, it is often difficult Engineering realization

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  • Method and apparatus for correcting non-uniformity of infrared imaging based on combined space-time filtering
  • Method and apparatus for correcting non-uniformity of infrared imaging based on combined space-time filtering

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] An embodiment of the present invention provides a method for correcting infrared imaging non-uniformity combined with spatio-temporal filtering, such as figure 1 As shown, the method is implemented through the following steps:

[0029] Step 101: Perform global filtering on the input original infrared non-uniformity image x(n) to obtain a globally filtered image z(n).

[0030] Specifically, the original infrared non-uniformity image x(n) is input, and global filtering is performed on it to obtain a globally filtered image z(n), where n represents the image of the nth frame.

[0031] The global spatial domain filter selected by global filtering is a nonlinear filter. This filter not only protects the edge details of the image, but also has good filtering performance for complex images with low signal-to-noise ratio. Therefore, the nois...

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Abstract

The present invention discloses a method for correcting non-uniformity of infrared imaging based on combined space-time filtering, comprising the steps of: performing global filtering for an inputted original infrared non-uniformity image x(n) to obtain a globally filtered image z(n); performing subtraction between the original infrared non-uniformity image x(n) and the globally filtered image z(n) to obtain a noise image zG(n); performing filtering processing for the obtained noise image zG(n) to obtain a pure non-uniformity noise image zGr(n) at a low frequency in time domain; and performing subtraction between the original infrared non-uniformity image x(n) and the obtained pure non-uniformity noise image zGr(n) at the low frequency in time domain to obtain a non-uniformity corrected infrared image y(n). The invention also discloses an apparatus for correcting non-uniformity of infrared imaging based on combined space-time filtering. According to the method and the apparatus of the invention, a high level of filtering performance can be kept for a complex image having a local non-repetitive or semi-random structure and an extremely low signal to noise ratio.

Description

technical field [0001] The invention belongs to the technical field of non-uniformity correction in infrared imaging preprocessing, and in particular relates to a method for correcting non-uniformity of infrared imaging combined with space-time filtering and a device thereof. Background technique [0002] Infrared focal plane arrays (IRFPA) detectors have a simple structure, high detection sensitivity, and a high system working frame rate. However, affected by factors such as materials, manufacturing process, and working environment, under uniform radiation irradiation, the response output of each detection unit in the infrared focal plane array is inconsistent, and this inconsistency is called non-uniformity. This non-uniformity leads to a decrease in the temperature resolution of the system and seriously affects the quality of the target image. It usually appears as a fixed pattern on the imaging image, so it is often called fixed pattern noise (Fixed Pattern Noise, FPN)....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 周慧鑫王慧杰荣生辉秦翰林延翔赖睿王炳健庞英名曹洪源殷宽金浩文杜鹃钱琨
Owner XIDIAN UNIV
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