Fast and noninterpolating method for subpixel displacement analysis of digital speckle images using phase shifts of spatial frequency spectra

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	Fast and noninterpolating method for subpixel displacement analysis of digital speckle images using phase shifts of spatial frequency spectra
	Lu, Helin ; Huang, Chaohong ; Wang, Cheng ; Wang, Xiaozhong ; Fu, Hongyan ; Chen, Ziyi ; Huang CH(黄朝红) ; Wang C(王程) ; Wang XZ(王晓忠) ; Fu HY(付宏燕)
刊名	http://dx.doi.org/10.1364/AO.53.002806
	2014-05-01
关键词	INTERPOLATION PHOTOGRAPHY PERFORMANCE ACCURACY
英文摘要	A fast noninterpolation method for calculating displacement of digital speckle images with subpixel precision was introduced. In this method, the precise displacement is obtained from phase shifts of spatial frequency spectra of two digital speckle images instead of digital correlation calculation. First, digital speckle images before and after displacement are windowed and fast Fourier transform is performed. Then, phase shifts of different spatial frequencies are linearly fitted in spectral space using the least square method, and a coarse displacement value is directly calculated according to the phase shift theorem of Fourier transform. By a window technique and iterative procedure, the influence of finite image size on the accuracy of the results is eliminated, and the accurate displacement is obtained finally. It is significant that the method obtains the subpixel-precision displacement without any interpolation operations. The test results show that the method has high computing efficiency, high precision, and good robustness to low image quality. (C) 2014 Optical Society of America
语种	英语
出版者	OPTICAL SOC AMER
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/92688]
专题	信息技术－已发表论文
推荐引用方式 GB/T 7714	Lu, Helin,Huang, Chaohong,Wang, Cheng,et al. Fast and noninterpolating method for subpixel displacement analysis of digital speckle images using phase shifts of spatial frequency spectra[J]. http://dx.doi.org/10.1364/AO.53.002806,2014.
APA	Lu, Helin.,Huang, Chaohong.,Wang, Cheng.,Wang, Xiaozhong.,Fu, Hongyan.,...&付宏燕.(2014).Fast and noninterpolating method for subpixel displacement analysis of digital speckle images using phase shifts of spatial frequency spectra.http://dx.doi.org/10.1364/AO.53.002806.
MLA	Lu, Helin,et al."Fast and noninterpolating method for subpixel displacement analysis of digital speckle images using phase shifts of spatial frequency spectra".http://dx.doi.org/10.1364/AO.53.002806 (2014).