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DIGITAL IN-LINE HOLOGRAM ENHANCEMENT USING FILTERING AND PADDING FOR PARTICLE CHARACTERIZATION
Date of Award
Campus Access Master's Report
Master of Science in Electrical Engineering (MS)
Administrative Home Department
Department of Electrical and Computer Engineering
Michael C. Roggemann
Raymond A. Shaw
Committee Member 1
Jeremy P. Bos
We studied the effect of image enhancement techniques on digital holograms based on an in-line holographic system for air-borne cloud droplet measurements. A super-Gaussian filter is applied to pre-process the padded raw hologram prior to the reconstruction. The size distribution of pre-processed hologram with padding and filtering depicts a shift to the larger diameter of cloud particles due to the dilation of detected particle images. The dilated particles reside within the instrument's detectable size range. Two different padding methods: (1) zero padding and (2) mean padding show almost identical consequence for number concentration and particle size dilation. However, the pre-processed hologram with padding alone results in minimal improvement.
Rahman, Ashfiq, "DIGITAL IN-LINE HOLOGRAM ENHANCEMENT USING FILTERING AND PADDING FOR PARTICLE CHARACTERIZATION", Campus Access Master's Report, Michigan Technological University, 2019.