Optimized matching imaging method and device for digital-domain TDI detector
An imaging method and detector technology, applied in image communication, color TV parts, TV system parts, etc., can solve problems such as unresolved images and degradation, and achieve the effect of reducing image blur and improving image quality
Active Publication Date: 2018-08-31
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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At present, the way to solve the problems caused by scan mismatch is usually to improve the scanning accuracy of the system and try to avoid scan mismatch, which does not solve the problem of image degradation caused by incorrect accumulation
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[0023] The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0024] The actual effect of this method is verified by using a 512*8 medium-wave digital TDI infrared detector red. The detector is placed on a one-dimensional turntable for scanning and imaging. The turntable speed is 1.3 times the correct matching speed, and the scanning direction is perpendicular to the column direction. A total of 8 independent memories are set up, corresponding to the number of columns of detectors, and different frames of images are stored...
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The present invention discloses an optimized matching imaging method and device for a digital-domain TDI (Time-Delay-Integration) detector. The method comprises the steps of: acquiring output signalsof the digital-domain TDI detector and storing the output signals independently by column; taking one memory as a reference, then reading data from the memory by column and taking the data as a targetcolumn; performing coarse matching between the target column and data of other memories, so as to extract corresponding matched areas; performing high-resolution reconstruction for the target columnand the matched areas and then performing precise matching, so as to obtain matched data segments of the target column; accumulating the target column and the matched data segments to obtain a TDI result of the column; and dynamically processing all column data to realize an optimized matching imaging process. The optimized matching imaging method of the invention avoids of the limitation that only adjacent pixels can be accumulated in a conventional TDI detector, and achieves the optimized TDI imaging process by adaptively searching corresponding accumulated positions.
Description
Technical field: [0001] The present invention relates to photoelectric signal processing technology, and specifically refers to an optimized matching imaging processing method applied to digital domain TDI detectors, which is applied to industrial imaging instruments or ground remote sensing imaging instruments, and is especially suitable for imaging dynamic range and signal-to-noise For occasions with higher requirements. Background technique [0002] Time-Delay-Integration (TDI) technology can greatly improve the sensitivity and signal-to-noise ratio of the imaging system by taking multiple exposures of the same scene. Therefore, TDI detectors are widely used in scanning imaging systems for high-resolution space remote sensing and low-light imaging. According to the sequence relationship between the time delay integration process and the analog-digital conversion (A / D C), it can be divided into two categories: analog domain TDI detectors and digital domain TDI detectors. ...
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IPC IPC(8): H04N5/369H04N5/355
CPCH04N25/58H04N25/70
Inventor 陈忻饶鹏韩冰赵云峰
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI