Sub-aperture stitching detection method based on frequency-domain and spatial-domain collaborative strategy

The sub-aperture stitching detection method using a frequency-space domain collaborative strategy solves the problems of strong initial value dependence, easy trapping in local extrema, and insufficient global error suppression capability in existing technologies. It achieves sub-pixel level precision optical element detection and improves the stability and accuracy of detection.

CN121829355BActive Publication Date: 2026-05-26CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Filing Date
2026-03-10
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing sub-aperture stitching detection methods suffer from strong initial value dependence, easy entrapment in local extrema, difficulty in achieving sub-pixel accuracy, lack of global error suppression capability, and sensitivity to outliers, making it difficult to meet the detection requirements of ultra-high precision optical components.

Method used

A sub-aperture stitching detection method based on frequency domain and spatial domain collaborative strategy is adopted. Coarse alignment is performed by phase correlation method, a continuous physical field model is constructed, and a global robust energy functional is established by using embedded geometric error culling operator and weighted graph Laplacian topology network. Subpixel-level micro-motion search and Gaussian weighted fusion are performed, and orthogonal basis is adaptively selected to remove system aberrations.

Benefits of technology

It improves the success rate and stability of stitching, achieves sub-pixel level registration accuracy, enhances robustness and reliability of measurement data, eliminates surface warping in long-distance areas caused by accumulated errors, and significantly improves detection accuracy.

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Abstract

This invention relates to the field of optical precision inspection, and particularly to a sub-aperture stitching inspection method based on a frequency-domain and spatial-domain collaborative strategy. The method includes: acquiring discrete phase data of the sub-apertures; constructing a continuous physical field model; performing coarse alignment of adjacent sub-apertures using frequency-domain phase correlation technology to obtain integer pixel displacements between adjacent sub-apertures; performing sub-pixel fine alignment using a numerical gradient method based on the continuous physical field model and a normalized cross-correlation function with an embedded geometric error culling operator; constructing a global robust energy functional for global optimization; solving for the zero-curvature pose under a floating reference, and then performing Gaussian gradient weighted fusion and adaptive orthogonal base surface reconstruction to obtain the full-aperture surface shape of the large-aperture optical element. This invention solves the problems of strong initial value dependence, displacement-tilt degeneracy, cumulative error warping, and sensitivity to outliers in traditional sub-aperture stitching inspection methods, achieving ultra-high precision and high robustness in the sub-aperture stitching inspection of large-aperture optical elements.
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