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Digital Speckle Correlation in Frequency Domain

Qi Dongping Teng Shuyun Cheng Chuanfu (Department of Physics, Shandong Normal University, Jinan 250014)  
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.
【CateGory Index】: O438
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