Energy compensation and chromatic aberration removal method for total-reflection optical splicing cameras

Abstract

Disclosed is an energy compensation and chromatic aberration removal method for total-reflection optical splicing cameras. The method comprise the processing steps of calculating an effective gray average of laboratory calibrated images and a column average of detectors in energy loss areas, and fitting first energy compensation coefficients of the detectors; selecting a great many on-orbit image data, calculating histograms of adjacent normal areas of the energy loss areas and histograms of each column of images after the first compensation in the energy loss areas respectively, and creating histogram lookup tables of the detectors in the energy loss areas; and removing chromatic aberration among splicing sheets based on adaptive gray information of image data overlapping areas. By means of the technical scheme of the energy compensation and chromatic aberration removal method for total-reflection optical splicing cameras, the energy loss problem of splicing areas of total-reflection optical splicing cameras can be solved, laboratory calibrated data of cameras before satellite launching and a great many on-orbit image data after satellite launching are fully used, and energy of the optical splicing areas is guaranteed to be compensated effectively.

Description

technical field [0001] The invention relates to a method for energy compensation and chromatic aberration elimination of a total reflection optical splicing camera, belonging to the field of optical remote sensing image processing. Background technique [0002] Linear array CCDs are widely used in aviation and aerospace optical remote sensors, as well as measurement, control and other fields. In order to expand the field of view or increase the measurement range, it is necessary to increase the number of pixels. The most effective and convenient way is to assemble multiple linear array CCDs Together, that is, CCD splicing. The HRV camera of the French SPOT satellite successfully uses CCD stitching technology. [0003] Linear array CCD splicing mainly includes mechanical splicing, electronic splicing and optical splicing. Mechanical splicing is to connect the CCD end to end so that they are in a straight line. However, there will be gaps between the CCD devices during direc...

AI Technical Summary

Problems solved by technology

This method can make full use of the laboratory calibration data before the satellite launch to correct, effectively ensure the energy compensation, and use a large number of in-orbit satellite image data to establish the gray-scale mapping lookup table of the energy loss detector after the satellite has been in orbit for a certain period , so as to solve the problem of energy attenuation near the stitching area caused by the optical stitching of total reflection cameras, and ensure the effective use of pixels in the overlapping area

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