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A method for repairing cold reflection dark spot of infrared imaging system

An infrared imaging system and repair method technology, applied in radiation pyrometry, optical radiation measurement, instruments, etc., to achieve the effect of solving the problem of bright edges, making the method easier, and optimizing the image display effect

Active Publication Date: 2019-11-22
北京长峰科威光电技术有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for repairing cold reflection black spots in the infrared imaging system in view of the problem of dark spots in the imaging of the current cooling infrared imaging system, which can realize the repair of the cold reflection problem in the infrared imaging system as the ambient temperature changes , reduce the difficulty of optical design and processing technology requirements, reduce the impact of cold reflection on imaging, and improve image quality

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Embodiment Construction

[0027] The repairing method principle of the infrared imaging system cold reflection black spot of the present invention is as follows:

[0028] In the practical application of cooled infrared imaging systems, non-uniformity correction before use can make the corrected image uniform, but the black spots formed by cold reflection will become more and more obvious as the temperature increases during use. Since the position of the black spot formed by narcissus is fixed in the image, and the degree of the black spot is related to the system temperature, the coordinate position of the black spot and the intensity of the black spot can be recorded. Dark spots are compensated and repaired.

[0029] Let the coordinate position of each pixel of each frame image acquired by the detector be (i, j), and the original data of each pixel be X i,j , after the non-uniformity correction is completed, the image data is Y i,j , recorded as:

[0030] Y i,j =NUC(X i,j ) 1)

[0031] Using the...

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Abstract

Provided is a method for repairing the cold reflection black spots of an infrared imaging system. If an infrared imaging system has cold reflection black spots before delivery, the distribution parameter is calculated for each pixel of an image and stored in the system, and the temperature TS at the time and the temperature T0 calibrated by the non-uniformity coefficient before delivery are stored; When the equipment is powered on for use, the distribution parameter of each pixel and TS and T0 are read from a storage device; when the equipment is powered on for non-uniformity correction, the temperature Tc during correction is recorded; when the equipment is used, non-uniformity correction is carried out on each pixel, the temperature correlation coefficient is calculated in real time according to the current system temperature T and TS, T0 and Tc, and the repair parameter of each pixel is calculated according to the distribution parameter and the temperature correlation coefficient; and the repair parameter of each pixel is superimposed on the non-uniformity correction result of the pixel, and an image with cold reflection black spots repaired is output finally.

Description

technical field [0001] The invention relates to the technical field of infrared imaging, in particular to a method for repairing cold reflection dark spots of an infrared imaging system. Background technique [0002] In the cooled infrared imaging system with an optical system, the cooling surface of the internal detector will be reflected by a certain optical element in the front during imaging. At this time, the detector will detect the signal of its own cold surface that is much lower than the ambient temperature. A dark spot will be formed in the center of the field of view, which seriously affects the imaging quality and target recognition. This imaging defect caused by repeated reflection is called cold reflection, also known as the temperature difference regeneration effect. Generally, the temperature of the infrared focal plane is controlled between 90-110K, and the thermal difference with the ambient temperature of 300K is large, and the extremely weak reflection wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/06
CPCG01J5/06
Inventor 杨超王沛毛建森
Owner 北京长峰科威光电技术有限公司
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