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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Author Spotlight: Unveiling the Potential of VSFG Microscopy in Studying Mesoscopically Heterogeneous Self-Assembled Structures
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基于偏振和多频谱共调的高动态范围3D测量.

Haorui Huang, Fuqian Li, Chenglin Zuo

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    |December 13, 2023
    PubMed
    概括

    这项研究引入了一种新的高动态范围 (HDR) 3D测量方法,使用边缘投影谱 (FPP) 来克服混合反射的挑战. 该技术有效地同时测量暴露过多和暴露不足的表面,提高了3D形状测量准确度.

    科学领域:

    • 光学工程是指光学工程.
    • 计量学 计量学 计量学
    • 计算机视觉 计算机视觉

    背景情况:

    • 三维 (3D) 形状测量在各个领域至关重要,边缘投射特征测量 (FPP) 是一种流行的非接触式高速技术.
    • 现实世界的测量场景经常涉及混合的镜像和分散的反射,导致共存的过度暴露和过度暴露的区域,这挑战了传统的FPP.
    • 使用FPP同时测量具有过度曝光和不足曝光区域的表面仍然是一个重要的技术障碍.

    研究的目的:

    • 解决FPP在混合反射环境中的局限性.
    • 提出一种新的高动态范围 (HDR) 3D测量方法,能够同时重建暴露过多和暴露不足的表面.
    • 为在HDR 3D测量中使用的多通道摄像头开发一个无注册错误的校准框架.

    主要方法:

    • 开发了一种混合反射模型来分析边缘图像中的极化和多谱共调效应.
    • 一个极化彩色摄像头捕获了边缘图像,利用共调制来实现不同频道的强度调制.
    • 合成了子图像以形成高调节边缘图像,使不同反射率的表面能够同时重建.

    主要成果:

    • 提出的方法成功地实现了在混合反射场景中同时对过度曝光和过度曝光的表面进行3D形状测量.
    • 实验结果表明,与传统方法相比,其性能优越,特别是在表现出镜像和散射反射的物体上.

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  • 为多通道摄像头引入了一种新的无注册错误校准框架,增强HDR区域的数据采集并消除注册错误.

    • 结论:

    • 提出的基于偏振和多频谱共调的HDR 3D测量方法有效地克服了复杂反射环境中的传统FPP的局限性.
    • 开发的技术能够准确地3D重建具有同时镜面和扩散表面的物体.
    • 新的校准框架确保了精确的多通道摄像机记录,有助于HDR 3D测量系统的整体准确性和可靠性.