상세정보
학술지
Dynamic Speckle Analysis with Coarse Quantization of the Raw Data
- 발행일
- 202003
- 출처
- Applied Optics, v.59 no.9, pp.2810-2819
- ISSN
- 1559-128X
- 출판사
- Optical Society of America (OSA)
- 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