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학술지 Dynamic Speckle Analysis with Coarse Quantization of the Raw Data
Cited 9 time in scopus Download 3 time Share share facebook twitter linkedin kakaostory
저자
Elena Stoykova, Dimana Nazarova, Lian Nedelchev, Branimir Ivanov, Blaga Blagoeva, 오관정, 박중기
발행일
202003
출처
Applied Optics, v.59 no.9, pp.2810-2819
ISSN
1559-128X
출판사
Optical Society of America (OSA)
DOI
https://dx.doi.org/10.1364/AO.384204
협약과제
20HH2600, [전문연구실] 홀로그램 영상 서비스를 위한 Holo-TV 핵심 기술 개발, 박중기
초록
Analysis of dynamic speckle formed on the surface of diffusely reflecting objects under laser illumination is a noncontact method for inspection of speed of processes. The paper deals with intensity-based implementation of the method that relies on statistical processing of correlated in time sequences of speckle images. A two-dimensional activity map is built for each sequence to visualize regions of different speed on the object surface at a given instant. A great number of images is required to track a process in time. We propose data compression by coarse quantization of the raw speckle data. Efficacy of quantization is analyzed by simulation and experiment for low- and high-contrast speckle patterns with bell-shaped and long-tailed distributions of intensity, respectively. Nonuniformquantization is proposed for long-tailed speckle intensity distributions.Decreasing the bit depth from8 to 4 causes no change in the probability density function of the activity estimate.
KSP 제안 키워드
Activity map, Bit depth, Coarse Quantization, Data analysis, Dynamic speckle, High contrast, Intensity distributions, Intensity-based, Laser illumination, Long-tailed distributions, Probability Density Function