Variable distance multispectral optical axis consistency spatio-temporal reference calibration method

Abstract

The present application relates to the field of photoelectric measurement, and more particularly to a variable distance multispectral optical axis consistency space-time reference calibration method. It comprises: establishing a tilted imaging coordinate system and an optical path model, introducing a double-tilt angle of the optical axis to construct a perspective projection model, and deducing a pixel line conversion coefficient and a tilted mapping relationship; performing distortion correction and sub-pixel extraction on a target crosshair image; collecting laser images, performing difference, filtering and morphological processing, fusing geometric circle fitting and gray centroid method to extract the light spot center and calculate the pixel deviation; establishing a pixel-angle-line quantity three-dimensional conversion chain; completing error synthesis through multi-distance weighted fusion and consistency index determination; generating a space-time reference parameter library, a dynamic compensation model and a standardized report. The advantage is that it solves the problem of unified optical axis reference under large tilt angle and variable distance working conditions, realizes high-precision center extraction of long-distance non-Gaussian light spots, and improves the calibration accuracy and engineering adaptability.

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