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Suppressing blooming interference in structured light systems by adaptively reducing camera oversaturated energy.

Pei-Ju Chiang, Chih-Chun Cheng, Chang-Hao Lin

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    Structured light systems struggle with blooming when scanning metal objects. This new method adaptively suppresses oversaturated areas and fuses multi-exposure results, outperforming conventional techniques for reliable 3D scanning.

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    Area of Science:

    • Optics and Photonics
    • Computer Vision
    • Metrology

    Background:

    • Structured light systems are crucial for 3D object scanning.
    • Blooming, caused by light over-saturation, significantly degrades fringe pattern quality when scanning reflective surfaces like metals.
    • Existing methods like High Dynamic Range (HDR) and adaptive projection fail to reliably mitigate blooming interference.

    Purpose of the Study:

    • To develop a novel method for effectively suppressing blooming interference in structured light 3D scanning of metal objects.
    • To improve the accuracy and reliability of 3D reconstruction in the presence of challenging surface reflectivity.

    Main Methods:

    • A new technique is proposed that adaptively suppresses oversaturated areas by adjusting exposure time.
    • Multi-exposure time fringe patterns are captured and decoded.
    • A decoding inheritance method is employed to fuse the results from different exposure times.

    Main Results:

    • The proposed method demonstrates superior performance in suppressing blooming compared to conventional approaches.
    • Experimental validation confirms significant reduction in fringe interference caused by blooming.
    • Enhanced quality of decoded fringe patterns for improved 3D reconstruction.

    Conclusions:

    • The adaptive suppression and multi-exposure fusion method effectively overcomes blooming limitations in structured light scanning.
    • This technique offers a more robust solution for 3D scanning of challenging metallic surfaces.
    • The findings pave the way for more accurate and reliable 3D metrology applications.