A method for MTF template matching measurement suitable for multi-focal lens

By employing template matching and semantic segmentation, the problems of large deviation, inaccurate positioning, and noise sensitivity in MTF measurement of multi-focus lenses are solved, achieving efficient and accurate MTF measurement. This method is applicable to lenses with different magnifications and defocus plane positions, reducing the need for equipment installation accuracy and algorithm dependence.

CN122115529APending Publication Date: 2026-05-29SOUTHWEST JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHWEST JIAOTONG UNIV
Filing Date
2026-01-20
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies for measuring the modulation transfer function (MTF) of multiple fixed-focus lenses suffer from problems such as large measurement deviations, inaccurate segmentation fringe positioning, narrow applicability, strong dependence on algorithm models, and sensitivity to noise, especially when measuring off-focus surfaces.

Method used

The template matching method is adopted. The focal plane image is captured by an industrial camera, the template size and position are adjusted, the hill climbing algorithm is used to determine the optimal scaling factor, and the stripes are detected and the data is calculated by combining semantic segmentation. This method is adapted to MTF measurement of lenses with different magnifications, reducing the dependence on algorithm correction and noise interference.

Benefits of technology

It improves the accuracy and efficiency of MTF measurement, is suitable for measuring the focal plane and defocus plane positions, simplifies the segmentation of fringe areas, reduces the requirements for equipment installation accuracy, enhances noise resistance, and adapts to the measurement needs of lenses with different magnifications.

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Abstract

The application discloses a kind of MTF template matching measurement methods suitable for multiple focusing lenses, specifically: industrial camera moves to focal plane, and shoots a focal plane image for subsequent template matching scale adjustment;Find the best zoom ratio using hill climbing algorithm, adjust the template size according to the ratio;After adjusting the template size, match the measurement area according to the template;Semantic segmentation detects stripe, after determining the horizontal and vertical stripe area, calculate the contrast of each area;Sort the contrast data according to the area, thereby corresponding to different stripe area number, mark the outer ring and inner ring measurement results and stripe number on the image, and finally draw two MTF curves of horizontal stripe and vertical stripe according to the measurement data.The application can improve the efficiency and accuracy of MTF measurement.
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