Acta Optica Sinica, Volume. 20, Issue 4, 489(2000)
Digital Speckle Correlation in Frequency Domain
An algorithm for the extraction of speckle displacement is presented. It performs the two-dimensional discrete cross-correlation of the sub-specklegrams from different specklegrams in the frequency domain and thus improves considerably the speed of a cross-correlation calculation. For more accurate measurements of the displacement field the level-limiting technique is introduced to reduce the noise, and to optimize the correlation filter for obtaining a narrower and higher correlation peak to provide the optimum estimate of the peak position.
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[in Chinese], [in Chinese], [in Chinese], [in Chinese]. Digital Speckle Correlation in Frequency Domain[J]. Acta Optica Sinica, 2000, 20(4): 489