Infrared focal plane array rectifying method
A technology of infrared focal plane and correction method, which is applied in the field of infrared imaging, can solve the problem of limited effective dynamic range of image output gray scale, and achieve the effect of increasing the dynamic range of imaging and improving environmental adaptability
Active Publication Date: 2015-03-11
ZHEJIANG DALI TECH
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[0007] The purpose of the present invention is to provide an infrared focal plane array correction method for the technical problems that the two-point correction of the calibration will introduce image non-uniformity and the effective dynamic range of the output image gray scale is limited in the prior art. The method of adapting to the adjustment area ensures that the adjustment and change of the detector parameters during use will not affect the quality of the output image, and it can also widen the effective dynamic range of the gray scale of the output image and meet the requirements for non-uniformity of the image. The method is simple and flexible. Easy to implement
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[0013] As a thermal imaging system, the infrared detector will cause changes in the internal temperature of the system after working for a long time. At the same time, the external ambient temperature will also affect the imaging results of the detector. These temperature changes will have a certain impact on the response of the detector, changing the detection The temperature sensing value inside the device will cause changes in the output image at the same time. Considering the above factors, the present invention provides an infrared focal plane array calibration method, which specifically includes the following steps: partition and parameter setting of each zone; adjustment of integration time; self-adaptive zone adjustment. The infrared focal plane array correction method provided by the present invention will be described in detail below in conjunction with the accompanying drawings.
[0014] refer to figure 1 , a schematic flowchart of an embodiment of an infrared foca...
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An infrared focal plane array rectifying method includes steps of 1) partitioning a detector according to standard gray values and temperature sensing values of uniform images in different temperature environments and acquiring and storing partition parameters corresponding to each partition; 2) calculating the average gray value of the uniform images acquired during automatic zero set, judging whether difference between the average gray value and the standard gray value in the partition parameters currently used is larger than the preset gray value threshold or not, if yes, adjusting integral time and recording integral time adjustment and adjustment times; 3) judging whether the integral time adjustment is larger than the preset integral time threshold or not, if yes, performing a step 4), otherwise performing the step 2); 4) matching the current average gray value and the current temperature sensing value at the current environmental temperature with the standard gray values and the temperature sensing values stored in the partitions so as to obtain a proximate partition, and calling the parameters stored in the proximate partition as current parameters of the detector, thereby outputting high-quality images at the higher temperature.
Description
technical field [0001] The invention relates to the technical field of infrared imaging, in particular to an infrared focal plane array correction method capable of adaptively adjusting regions. Background technique [0002] In the infrared imaging system, the infrared focal plane array has certain non-uniformity due to manufacturing technology, process and material, and the existence of these non-uniformities will affect the imaging quality of the system. At present, the method widely used in engineering to improve the output image quality of infrared imaging system is two-point correction based on calibration, and the disadvantage of two-point correction is that the effective dynamic range of the gray scale of the obtained image is limited. Considering the proportional relationship between the integration time and the output of the focal plane detector, the current infrared imaging system expands the dynamic range by adjusting the integration time; but when the irradiance ...
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Inventor 陈刚夏衍韩建贸蒋骏飞
Owner ZHEJIANG DALI TECH