Three-dimensional two-dimensional code surface information reconstruction method and device, equipment and storage medium

By using the exposure fusion contrast enhancement algorithm and the four-light source photometric stereo method to reconstruct the normal vector field, the problem of large errors in stereo QR codes in low-contrast environments is solved, and high-precision QR code reconstruction is achieved, which is suitable for the recognition of complex material surfaces.

CN120805960APending Publication Date: 2025-10-17HUBEI UNIV OF TECH
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Patent Information

Application Number
CN202510818056.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-18
Publication Date
2025-10-17

AI Technical Summary

Technical Problem

Existing 3D QR code technology faces problems such as insufficient contrast and high noise interference on the surface of low-reflectivity materials, making it difficult for traditional visual systems to decode. In particular, the surface texture contrast of 3D QR codes laser-marked on car tires is extremely low, making it difficult for traditional image processing methods to accurately extract and restore the QR code information.

Method used

The contrast of the initial image set of the stereo QR code is enhanced by an exposure fusion-based contrast enhancement algorithm. The normal vector field is reconstructed by combining the four-light source photometric stereo method and the Poisson solution, and then converted into a depth image. Finally, the QR code image is reconstructed through grayscale conversion and threshold segmentation.

Benefits of technology

It improves the image contrast and detail retention capabilities, can reconstruct three-dimensional two-dimensional codes with high precision in low-contrast environments, solves the problem of large error in information extraction in existing technologies, and adapts to the recognition of complex material surfaces.

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Abstract

The invention provides a three-dimensional two-dimensional code surface information reconstruction method, device and equipment and a storage medium, and belongs to the technical field of image processing and three-dimensional reconstruction, and the method comprises the steps: carrying out the contrast enhancement of an initial image set of a three-dimensional two-dimensional code based on an exposure fusion contrast enhancement algorithm, and obtaining a contrast-enhanced image set, the initial image set comprises three-dimensional two-dimensional code images obtained by lighting and shooting the three-dimensional two-dimensional code at four different space angles; normal vector field reconstruction is carried out on the surface of the stereo two-dimensional code based on a four-light-source photometric stereo method and a contrast enhancement image set; converting the established normal vector field into a depth image based on a Poisson solution; and obtaining a reconstructed two-dimensional code image based on the depth image. According to the invention, the technical problem that the error of the surface information of the low-contrast stereo two-dimensional code extracted in a complex environment in the prior art is large is effectively solved.
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