A structured light super-depth-of-field measurement system based on in-focus and out-of-focus algorithms

The structured light ultra-depth-of-field measurement system based on focusing and defocusing algorithms solves the problems of 3D imaging quality and low measurement efficiency for objects without obvious texture features, and achieves high-precision and high-speed 3D measurement, which is suitable for non-contact measurement of complex shapes and objects with high detail.

CN122360342APending Publication Date: 2026-07-10BEIJING BOVISION TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING BOVISION TECH CO LTD
Filing Date
2026-04-14
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies struggle to extract effective feature points when processing objects without obvious texture features, resulting in poor 3D imaging quality. Furthermore, traditional structured light measurement systems have low measurement efficiency, making it difficult to meet the high-speed requirements of industrial automation online inspection.

Method used

A structured light ultra-depth measurement system based on focusing and defocusing algorithms is adopted. A linear motor drives the microscope objective to scan longitudinally, and a periodic grating phase-shifting stripe is projected by a structured light projector. Images are acquired using a high-speed industrial camera, and three-dimensional coordinate information is calculated through modulation demodulation and peak positioning algorithms to generate a three-dimensional topographic image.

Benefits of technology

It achieves high-precision 3D measurement over a large depth range, is suitable for complex shapes and highly detailed objects, has non-contact measurement capabilities, is suitable for sensitive or fragile objects, and has a fast measurement speed, making it suitable for industrial automation and online inspection.

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Abstract

The application discloses a kind of structure light super depth-of-field measurement systems based on focusing and defocusing algorithm, it is related to precision measurement technical field, including: measured object, microscopic objective, linear motor, structure light projector, light splitting prism, tube lens and high-speed industrial camera composition.The linear motor drives microscopic objective longitudinal layered scanning, projector synchronous projection phase shift grating stripe, after collimating by prism reflection, object collimate after being vertically irradiated measured object surface, reflected light is focused to camera again by objective, prism and tube lens.By layer-by-layer acquisition different focal plane image, the change curve of each pixel modulation is analyzed, combined with modulation demodulation and peak positioning algorithm, the best focusing height is solved, three-dimensional coordinate is acquired, and finally the three-dimensional topographic image of measured object is reconstructed.The application aims at solving the technical problems that existing super depth-of-field three-dimensional measurement technology fails to measure featureless surface, precision and efficiency are difficult to consider.
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