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相关概念视频

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

79
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
79

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相关实验视频

Updated: Jun 12, 2025

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

Published on: December 3, 2013

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基于相位移编码的2加2边缘投影造型测量.

Hechen Zhang1, Jin Zhou2, Dan Jia3

  • 1Institute of Optics Electronics, Chinese Academy of Sciences, Chengdu, 610207, China.

Scientific reports
|September 19, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的绝对相位检索算法,用于边缘投射特征测量,将所需的边缘从许多减少到只有四个. 这种方法提高了3D测量的边缘顺序映射精度和效率.

关键词:
3D表面测量测量 3D表面测量测量绝对阶段检索的绝对阶段检索.边缘订单的纠正边缘投影形测量 边缘投影形测量阶段编码的阶段编码.

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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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相关实验视频

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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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科学领域:

  • 光学计量学 在光学计量学
  • 3D成像是3D成像中的一种.
  • 计算机视觉 计算机视觉

背景情况:

  • 边缘投射造型测量 (FPP) 是3D形状测量的一个关键技术.
  • 在FPP中解封时间阶段往往需要大量的边缘模式,增加数据采集时间和复杂性.
  • 当前的方法在减少边缘数量时,在效率和准确性方面扎.

研究的目的:

  • 提出一个简洁的绝对相位检索算法,大大减少所需的边缘模式的数量.
  • 为了提高FPP中边缘顺序映射的准确性和稳定性.
  • 开发一种方法,其准确性和适应性与现有技术相比较,但使用的边缘较少.

主要方法:

  • 开发了一种新的算法,只能投射四个边缘.
  • 具有高频率的两个直角边框捕获初始高度数据.
  • 另外两个相位移边缘用于强大的边缘顺序标签.
  • 一个平均强度一次性提取算法解码边缘模式.
  • 一个通用的边缘顺序校正算法解决了常见的错误和错位.

主要成果:

  • 提出的方法只使用四个边缘图案,成功地恢复绝对相位.
  • 它通过接操作实现了包装和梯级编码相的直接提取.
  • 该算法表现出与传统相位编码方法相似的准确性和适应性.
  • 该方法有效地纠正相位错误和错位.

结论:

  • 开发的算法在FPP中显著减少了时间阶段解封的边缘数.
  • 它为绝对相位检索提供了强大而准确的方法.
  • 与现有的方法相比,这种技术为3D形状测量提供了更有效和更适应的解决方案.