Dynamic interference fringe distortion correction method for pixel response frequency domain measurement

Abstract

The invention discloses a dynamic interference fringe distortion correction method for pixel response frequency domain measurement. The method comprises the steps of S1, obtaining preprocessed staticinterference fringe images; S2, obtaining a real space frequency of static interference fringes; S3, carrying out exposure by a CMOS image sensor within a period of time according to a fixed frame frequency, and collecting a group of dynamic interference fringe images, and obtaining preprocessed dynamic interference fringe images; S4, computing a space frequency of dynamic interference fringes influenced by a rolling shutter, and contrast and phase output by each pixel; S5, computing moving speed of the dynamic interference fringes through utilization of the real space frequency of the staticinterference fringes and the space frequency influenced by the rolling shutter; and S6, correcting the phase output by each pixel in the S4 through utilization of the real space frequency of the static interference fringes and the moving speed of the dynamic interference fringes, thereby obtaining distortion corrected pixel output phases.

Description

technical field [0001] The invention relates to the fields of astronomy and space technology, in particular to a dynamic interference fringe distortion correction method for pixel response measurement. Background technique [0002] In recent years, with the development of VLSI technology, the resolution, sensitivity, quantum efficiency and other technical indicators of CMOS image sensors have been greatly improved, coupled with its small size, light weight, low power consumption, read frame With the advantages of high efficiency, strong radiation resistance, and low cost, CMOS image sensors have become a strong competitor of CCDs in many fields, and have been widely used in astronomical imaging, spectroscopy, astrometry, space technology and other fields. Common CMOS image sensors mostly use rolling shutter. In addition to cost and process limitations, compared with CMOS using global shutter, CMOS using rolling shutter has great advantages in sensitivity, dynamic range, nois...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect of rolling shutter distortion in the image when dynamic interference fringes are used to calibrate the pixel response of a rolling shutter CMOS image sensor, thereby providing a dynamic interference fringe distortion correction method for pixel response frequency domain measurement

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