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Error analysis for polychromatic speckle contrast measurements

机译：多色斑点对比测量的误差分析

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摘要

Revival of interest in speckle technologies raises a curial question on the accuracy calculation of speckle measurements. In particular, the accuracy calculation of speckle contrast, an important metrics of a stochastic process, is quite different from the accuracy calculation of a typical intensity measurement. Speckle contrast depends more on stochastic characteristics of a process rather than on hardware characteristics. In this article, we consider errors introduced by the limited number of available speckle and by intensity saturation for monochromatic and polychromatic speckles. Equations for these types of errors were derived. Particularly, we show that the error due to limited number of speckles is inversely proportional to the square root of the speckle number, in the similar way as the average intensity error. For the error due to limited dynamic range of a recording device, the truncation effect increases the error as the mean intensity increased. Monochromatic speckles are more sensitive to such truncation than polychromatic speckles. We report the optimal mean intensity in terms of the pixel depth of a recording device and the total number of speckle recorded. In addition, a recommendation to minimize the saturation error for a typical camera is included.
机译：对散斑技术的兴趣的复兴引起了对散斑测量精度计算的质疑。特别地，斑点对比度的准确性计算是随机过程的重要指标，与典型强度测量的准确性计算有很大不同。斑点对比更多地取决于过程的随机特性，而不是硬件特性。在本文中，我们考虑了可用斑点数量有限以及单色和多色斑点的强度饱和所引入的误差。得出了这些类型的错误的方程式。特别地，我们表明，由于斑点数量有限而导致的误差与斑点强度的平方根成反比，与平均强度误差类似。对于由于记录设备的动态范围有限而引起的误差，随着平均强度的增加，截断效应会增大误差。单色斑点比多色斑点对这种截断更敏感。我们根据记录设备的像素深度和记录的斑点总数报告了最佳平均强度。此外，还包括建议，以使典型摄像机的饱和度误差最小。

著录项

  • 来源
    《Optics and Lasers in Engineering》 |2011年第12期|p.1397-1401|共5页
  • 作者

    L Tchvialeva; I. Markhvida; T.K. Lee;

  • 作者单位

    Photomedicine Institute, Department of Dermatology and Skin Science, Vancouver Coastal Health Research Institute and University of British Columbia, Vancouver, Canada;

    Photomedicine Institute, Department of Dermatology and Skin Science, Vancouver Coastal Health Research Institute and University of British Columbia, Vancouver, Canada;

    Photomedicine Institute, Department of Dermatology and Skin Science, Vancouver Coastal Health Research Institute and University of British Columbia, Vancouver, Canada,Cancer Control Research, BC Cancer Research Centre, Vancouver, Canada,School of Computing Science, Simon Fraser University, Bumaby, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    speckle contrast; error analysis; polychromatic speckle;

    机译：斑点对比错误分析;多色斑点;

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