3D imaging method and system based on structured light phase measurement

By combining system calibration and frequency domain fringe order calculation with order self-checking and error correction algorithm, the misjudgment problem in phase discontinuity region of structured light phase measurement technology is solved, realizing high-precision 3D imaging, which is suitable for dynamic scenes and complex surfaces.

CN122130011APending Publication Date: 2026-06-02BEIJING BOVISION TECH CO LTD
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Patent Information

Application Number
CN202610374970.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-25
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing structured light phase measurement technology suffers from problems such as fringe order misjudgment and error propagation when dealing with phase discontinuous regions such as depth jumps, shadows, high reflectivity, and noise pollution. It cannot effectively reconstruct isolated and disconnected regions, and existing improvement schemes cannot adapt to dynamic scenes or have insufficient accuracy.

Method used

The system obtains intrinsic and extrinsic parameters through system calibration, determines the effective measurement depth range and the effective absolute phase interval, calculates the initial fringe order using a frequency domain fringe order no-neighborhood solution algorithm, performs no-neighborhood verification and error correction through an order self-verification and error correction algorithm, and performs high-precision order error correction by combining a multi-factor joint scoring model, and finally solves the absolute phase map of the entire field of view.

Benefits of technology

It breaks through the dependence on the phase continuity of adjacent pixels, solves the problems of stripe order misjudgment and error propagation in phase discontinuous scenes, realizes high-precision phase unfolding of isolated and unconnected regions, and improves the robustness of complex surface scenes.

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Abstract

The invention discloses a 3D imaging method and system based on structured light phase measurement, and relates to the technical field of 3D imaging, and the method comprises the steps: calibrating a structured light measurement system, obtaining internal parameters and external parameters, and determining an effective measurement depth range and a corresponding absolute phase effective interval; controlling a projector to project a preset sine fringe pattern to a measured scene, and collecting a deformed fringe image modulated by the surface of a measured object to obtain a wrapped phase diagram; according to the effective measurement depth range, calculating the initial fringe level of each pixel through a frequency domain hierarchical fringe level non-neighborhood solution algorithm; according to the absolute phase effective interval, performing non-neighborhood verification and error correction on the initial stripe level through a level self-verification and error correction algorithm to obtain a final stripe level; and according to the wrapped phase diagram and the final fringe order, resolving to obtain an absolute phase diagram of a full view field, and converting point cloud data. The invention aims to solve the technical problem that the existing space phase unwrapping technology depends on the continuity of adjacent pixels.
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