On-orbit noise autonomous suppression method for image detector
An image detector and noise technology, applied in image communication, TV, color TV parts, etc., can solve the problems of large amount of calculation, waste of storage resources, etc., and achieve the effect of reducing waste
Inactive Publication Date: 2017-10-31
NORTHWESTERN POLYTECHNICAL UNIV +2
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[0009] In order to solve the technical problems of large amount of calculation, waste of storage resources, and the need to upload calibration data continuously in the prior art for on-board software to remove white noise points, dark current non-uniformity, and fixed pattern noise, the present invention provides an image detector in Rail Noise Autonomous Suppression Method
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[0032] An image detector on-orbit noise autonomous suppression method, comprising the following steps:
[0033] 1) Collect the nth frame of image, and perform target detection on the target surface of the image detector;
[0034] 2] If the image detector target surface detects M targets (where M is an integer, and M≥1), calculate the centroid of M targets and the size of the target window ΔX i and ΔY i , i=1,2,...,M, execute step 3]; if no target is detected, execute step 1];
[0035] 3) Collect the n+1th frame image, and calculate the centroid of M targets in the n+1th frame;
[0036] 4] Calculate the centroid distance difference δ of M targets in two adjacent frames of images i ;
[0037] 5] Establish a background correction template B corresponding to the target window for M targets i , where i=1,2,...,M,B i by N i ×N i elements, where N i =m×max{ΔX i ,ΔY i ,δ i}, m≥2; B i The initial value of the element in the middle is 0;
[0038] 6] Loop processing M targe...
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The invention relates to an image detector on-orbit noise autonomous suppression method, comprising the following steps: 1) collecting the nth frame of image, and performing target detection on the target surface of the image detector; 2) if M targets are detected on the target surface of the image detector , execute step 3]; if no target is detected, execute step 1]; 3] collect the n+1th frame image, and calculate the centroid of the M target in the n+1th frame image; 4] calculate two adjacent frames The centroid distance difference δi of M objects in the image; 5] Use the centroid distance difference δi to establish a background correction template Bi corresponding to the target window for M targets; 6] Process M target windows in a loop, and the processing process of each target window is :7] Traversing M target windows, using the gray centroid method to calculate the centroid of the target on-orbit noise autonomously suppressed according to the corrected pixel gray in the window. The invention solves the technical problems of wasting storage resources and needing to continuously upload calibration data in the prior art.
Description
technical field [0001] The invention relates to an on-orbit noise autonomous suppression method of an image detector, which can realize the autonomous compensation of the image detector noise on the satellite. Background technique [0002] The image detector, also called the image sensor, is the core part of the spaceborne camera. According to the different components, it can be divided into two categories: CCD (Charge Coupled Device, charge-coupled device) and CMOS (Complementary Metal-Oxide Semiconductor, metal oxide semiconductor device). [0003] Although CCD and CMOS are quite different in technology, the performance gap between CCD and CMOS is not very large. At present, CCD and CMOS image detectors are widely used in fields such as astronomical observation, visible light imaging and space optics. [0004] The output signals of CCD and CMOS image detectors are mixed with various noises and interferences, mainly including thermal noise, dark current noise, shot noise,...
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IPC IPC(8): H04N5/357H04N5/365H04N5/361
Inventor 闫荣华胡永明彭进业马冬梅
Owner NORTHWESTERN POLYTECHNICAL UNIV