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相关概念视频

Stereoisomers02:32

Stereoisomers

17.5K
On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to...
17.5K

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相关实验视频

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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

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NPC-SPU:基于非线性相位编码的立体相位解封,用于高效的3D测量.

Ruiming Yu, Hongshan Yu, Wei Sun

    IEEE transactions on image processing : a publication of the IEEE Signal Processing Society
    |September 8, 2025
    PubMed
    概括

    本研究引入了一种用于3D成像的新型非线性相位编码方法,显著提高了精度,并减少了动态场景中较少模式的错误. 这种新的方法提高了用于工业测量的3D重建性能.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 计算机视觉和图像处理
    • 计量学 计量学 计量学

    背景情况:

    • 使用相位移结构光的3D成像对于非接触式工业测量至关重要.
    • 现有的方法,如多频异常 (M-FH) 和空间域调制相位移 (SDM-PS) 有局限性,包括许多所需的图像或妥协的准确性,并且对运动敏感.

    研究的目的:

    • 提出一种基于非线性相位编码的立体相位解封 (NPC-SPU) 方法,以克服现有的3D成像技术的局限性.
    • 以更少的图案实现准确和强大的3D重建,特别是在动态和复杂的场景中.

    主要方法:

    • 在编码阶段引入了非线性扭曲功能,同时保持了阶段代码词信号与噪声比.
    • 开发了使用扭曲信息的局部相位解封方法和预校准的立体制约系统,以减少相位模两可.
    • 提出了局部相位相关匹配 (LPCM) 技术,用于轻量级和强大的相位解封,避免复杂的强度内核匹配.

    主要成果:

    • 该NPC-SPU方法显著提高3D重建性能在场景与大深度,大差异,复杂的彩色结构和动态场景.
    • 在动态环境 (20mm/s) 中,NPC-SPU 实现了较低的测量误差率 (0.7829%) 与传统的三频异常 (T-FH) (6.4962%) 相比,只使用 3 个模式 (vs. 9 个模式).
    • 与使用相同数量的模式的SDM-PS方法 (0.3232 mm) 相比,NPC-SPU显示出更高的测量精度 (0.1102 mm) (3).

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    结论:

    • 拟议的NPC-SPU方法为3D成像提供了强大而准确的解决方案,克服了传统方法的运动灵敏度和模式要求.
    • 在精度,效率和适用于具有挑战性的3D重建场景方面,NPC-SPU提供了显著的优势.
    • 这一进步有望改善工业测量和3D重建技术.