Correction method and device for image distortion of a rotating mirror

By calculating the offset and reflectivity information between the mirror surfaces of the rotating mirror, and combining the cubic spline difference formula, the image distortion problem of high-speed rotating mirrors was solved, and high-precision image correction was achieved.

CN121804828BActive Publication Date: 2026-06-09ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Filing Date
2026-03-06
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

During the imaging process of high-speed rotating mirrors, image stretching, distortion and other distortion phenomena are caused by the non-coplanarity of multiple mirror surfaces. Existing tower difference correction methods have low accuracy and are complicated to operate, which cannot meet the high-precision correction requirements of high-speed rotating mirrors.

Method used

By using the first mirror of the rotating mirror to obtain the reference image, and calculating the tower difference offset and reflectivity information with the scanned images of the other mirrors, the coordinate matrix of the actual sampling grid is generated, and the distortion is corrected using the cubic spline difference formula to ensure the one-to-one correspondence of the data of each mirror.

Benefits of technology

It effectively corrects the distortion and stretching of high-speed rotating mirror images, improving image accuracy.

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Abstract

The present application relates to the technical field of precision optical detection. The image distortion correction method for a rotating mirror comprises the following steps: obtaining the relative tilt difference offset and reflectivity information of the scanning image of the remaining surface of the rotating mirror relative to the reference image by calculating the reference image obtained by the first mirror surface and the scanning image of the remaining surface of the rotating mirror; ensuring the one-to-one correspondence of the tilt difference data of each surface of the rotating mirror with the first mirror surface and the scanning image of the remaining surface by comparing the reflectivity curve of the scanning image of the remaining surface with the reference reflectivity curve of the reference image; obtaining the tilt difference offset curve corresponding to the scanning image of the remaining surface, and generating the coordinate matrix corresponding to the actual sampling grid; and correcting the distortion of the actually collected image by comparing the actual sampling grid with the ideal uniform sampling grid. The technical problem of image distortion such as distortion and stretching of the actually collected image of the rotating mirror is solved, and the accuracy of the image collected by the rotating mirror is higher.
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