Abstract: In order to eliminate the influence of stray light, a quantitative stray light template was established. Based on the establishment of a segmented analytical fold mirror aperture by discrete sampling, the spatial coordinates of the optical components related to direct stray light were first established, and then transformed into unit spherical coordinates and projected onto plane polar coordinates. The quantitative template of direct stray light was established by vertex method and dot matrix method. Through the fast Fourier forward and inverse transform, a method of simulating and eliminating the influence of direct stray light by convolution of image and quantitative template was proposed. Through the edge extraction function, the earth disk was separated from the cold space to quantitatively examine the processing effect.
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