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Inter-frame registration and adaptive step length-based infrared image non-uniformity correction method

A non-uniformity correction, adaptive step size technology, applied in image enhancement, image analysis, image data processing and other directions, can solve the problem of unsatisfactory correction effect, and achieve the effect of good correction effect and fast convergence speed.

Inactive Publication Date: 2018-10-16
XIDIAN UNIV
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Problems solved by technology

[0004] The inter-frame registration method has a fast convergence speed, completely depends on the scene, and has a certain non-uniformity correction effect; however, the inter-frame registration method is not ideal in the case of strong non-uniformity.

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[0051] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0052] An embodiment of the present invention provides an infrared image non-uniformity correction method based on inter-frame registration and adaptive step size, such as figure 1 The method shown is:

[0053] Step 1: Input all images of the original infrared image sequence;

[0054] specifically, figure 2 In the embodiment of the present invention, the 500th frame has an original infrared image with non-uniformity; the original image sequence with non-uniformity has a total of 500 frame images, and the size of each frame image is 320×256 pixels; from figure 2 It can be seen that the original...

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Abstract

The invention discloses an inter-frame registration and adaptive step length-based infrared image non-uniformity correction method. The method comprises the steps of firstly calculating normalized cross-power spectrums of original infrared images, with non-uniformity, of an nth frame and an (n-1)th frame, and obtaining horizontal relative displacements and vertical relative displacements of the original infrared images, with the non-uniformity, of the nth frame and the (n-1)th frame; secondly calculating out a spatial variance and a time variance of each pixel of the original infrared image, with non-uniformity, of the nth frame, calculating an adaptive iterative step length of each pixel of the original infrared image, with non-uniformity, of the nth frame by utilizing the obtained spatial variance and time variance, and updating a gain correction coefficient and a bias correction coefficient by using the iterative step length; and finally performing non-uniformity correction on the pixels of an overlapping region of the original infrared images, with the non-uniformity, of the nth frame and the (n-1)th frame.

Description

technical field [0001] The invention belongs to the field of infrared image processing, and in particular relates to an infrared image non-uniformity correction method based on inter-frame registration and adaptive step size. Background technique [0002] Due to the influence of manufacturing process and materials, infrared detectors will produce different outputs even under the same incident radiation conditions, that is, response non-uniformity; in addition, the charge transfer efficiency of different pixels is inconsistent, IRFPA blind Factors such as the influence of elements, the influence of infrared optical system, the non-uniformity brought by signal amplification, 1 / f noise, the non-uniformity brought by A / D conversion and the external temperature are all the reasons for the non-uniformity; The image is characterized by low resolution, low signal-to-noise ratio, and poor contrast, so non-uniformity correction must be performed before use to improve the quality of in...

Claims

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T2207/10048G06T2207/20056G06T5/80
Inventor 周慧鑫赵东钱润达郭立新贾秀萍周峻黄楙森秦翰林姚博于跃李欢宋江鲁奇王炳健成宽洪杜娟宋尚真
Owner XIDIAN UNIV
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