Infrared focal plane array bias elimination circuit and method
A technology of infrared focal plane and circuit elimination, applied in TV, electrical components, color TV, etc., can solve problems such as the inability to improve the dynamic range of the system
Active Publication Date: 2021-07-16
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Solve the problem that the existing infrared image correction method cannot improve the dynamic range of the system
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[0045] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation.
[0046] like figure 1 As shown, the infrared focal plane array offset elimination circuit in this embodiment includes a signal processing module, a controller module, an offset generation module and a storage module, wherein:
[0047] The input of the signal processing module is respectively connected with the output of the offset generation module and the infrared focal plane array, and the signal processing module first corresponds the analog signal output by each pixel position of the infrared focal plane array to the pixel position output by the offset generation module The initial bias signal is subtracted in the analog domain, and the signal after the subtraction is amplified, and then converted from analog to digital to output a digital image signal; after obtaining the updated bias signal, the infrared focal plane array is The analog s...
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The invention relates to an infrared image correction method, in particular to an infrared focal plane array bias elimination circuit and method. The problem that an existing infrared image correction method cannot improve the dynamic range of a system is solved. The circuit comprises a signal processing module, a controller module and a bias generation module, wherein the input of the signal processing module is connected with the output of the infrared focal plane array and the output of the bias generation module, the controller module is connected with the signal processing module, and the output of the controller module is connected with the input of the bias generation module; if a camera works in a bias elimination matrix calibration mode, the signal processing module is used for outputting digital image signals to calculate the bias elimination matrixes corresponding to the pixel positions, in a working mode, the bias elimination matrixes are used for eliminating bias in each pixel output signal of the infrared focal plane array, and meanwhile the dynamic range of the system can be widened.
Description
technical field [0001] The invention relates to an infrared image correction method, in particular to an infrared focal plane array offset elimination circuit and method. Background technique [0002] As the core device in infrared detection system, infrared focal plane array has been widely used in infrared camera system, infrared multispectral and hyperspectral system. In practical applications, the infrared images acquired by the imaging system have obvious spatial non-uniformity-fixed pattern noise. This spatial non-uniformity is mainly due to the spatial non-uniformity of the infrared focal plane array itself and various types of parameter fluctuations. The spatial non-uniformity of infrared imaging system is manifested as gain non-uniformity and bias non-uniformity. The existence of bias non-uniformity reduces the utilization rate of the input range of the analog-to-digital conversion module and limits the dynamic range of the system. At present, there are many infr...
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IPC IPC(8): H04N5/217H04N5/33
CPCH04N5/33H04N23/81
Inventor 李洪波杨凡超闫鹏张昕刘宏于涛高晓惠胡炳樑
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI