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<p>In the field of laser speckle measurement, background interference has always been a major factor affecting the accuracy of measurements. The traditional Fourier analysis method can eliminate the background noise with certain periodicity, but the processing effect is not good for the complex background, and the operation of the signal is easy to lead to new errors. This study explores the application of a speckle differential measurement method in laser projection images through experiments with one-dimensional and two-dimensional sinusoidal signals, as well as step signals, combined with data simulation and actual measurement verification. The results demonstrate that this method effectively mitigates the interference caused by screen structure, brightness inhomogeneity, and pixel structure on measurement outcomes. Furthermore, it significantly enhances the accuracy of speckle contrast measurement. This research provides a simple and reliable new approach for the accurate measurement of speckle contrast.</p>

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Differential measurement method for laser speckle under reduced background interference

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Hong Liu,
  • Xintong Qin,
  • Renjie Xu,
  • Weisheng Wang

摘要

In the field of laser speckle measurement, background interference has always been a major factor affecting the accuracy of measurements. The traditional Fourier analysis method can eliminate the background noise with certain periodicity, but the processing effect is not good for the complex background, and the operation of the signal is easy to lead to new errors. This study explores the application of a speckle differential measurement method in laser projection images through experiments with one-dimensional and two-dimensional sinusoidal signals, as well as step signals, combined with data simulation and actual measurement verification. The results demonstrate that this method effectively mitigates the interference caused by screen structure, brightness inhomogeneity, and pixel structure on measurement outcomes. Furthermore, it significantly enhances the accuracy of speckle contrast measurement. This research provides a simple and reliable new approach for the accurate measurement of speckle contrast.