Zero-Padding Number of Convolution Approach and Angular Spectrum for Reconstructing Microscopic Hologram[J]. 2014, 48(5): 113-117.
DOI:
Zero-Padding Number of Convolution Approach and Angular Spectrum for Reconstructing Microscopic Hologram[J]. 2014, 48(5): 113-117.DOI: 10.7652/xjtuxb201405020.
Zero-Padding Number of Convolution Approach and Angular Spectrum for Reconstructing Microscopic Hologram
The influence of zero-padding number in zero-padding hologram on reconstructed image and system efficiency is analyzed by combining angular spectrum in digital holographic microscopy with the size relation between magnified image and reconstructed plane. The gradient method is used to evaluate the quality of reconstructed image. The frequency of real image or virtual image is obtained by frequency filter. The object magnified image is obtained by convolution approach or angular spectrum. The evidence of choosing zero padding number is proposed according to the quality of reconstructed image and system efficiency. The experimental results are consistent with theoretical analysis. It demonstrates that the smallest zero-padding number ensuring the size of reconstructed image larger than the magnified image is the best one
at that time the highest quality of reconstructed image is achieved with smallest calculating task.
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