Fast, sub-pixel accurate, displacement measurement method: optical and terahertz systems.

A novel (to the best of our knowledge), fast method to measure in-plane object motion in 1D with sub-pixel accuracy which complements the correlation technique is proposed. The method is verified experimentally using both visible and terahertz images. The absolute sum of grey level accumulated change is used to quantify object motion. The method requires calibration for each target, but only addition and subtraction operations. This results in a decrease of two orders of magnitude in the computation time.

[1]  Max A. Viergever,et al.  Mutual-information-based registration of medical images: a survey , 2003, IEEE Transactions on Medical Imaging.

[2]  Irene G. Karybali,et al.  An efficient spatial domain technique for subpixel image registration , 2008, Signal Process. Image Commun..

[3]  Manuel Guizar-Sicairos,et al.  Efficient subpixel image registration algorithms. , 2008, Optics letters.

[4]  Yun Zhang,et al.  Wavelet-based image registration technique for high-resolution remote sensing images , 2008, Comput. Geosci..

[5]  Dennis M. Healy,et al.  Interpolation Artifacts in Sub-Pixel Image Registration , 2009, IEEE Transactions on Image Processing.

[6]  Kai Li,et al.  A fast digital image correlation method for deformation measurement , 2011 .

[7]  Jacqueline Le Moigne,et al.  Image Registration for Remote Sensing: Similarity Metrics for Image Registration , 2011 .

[8]  A. Kääb,et al.  Sub-pixel precision image matching for measuring surface displacements on mass movements using normalized cross-correlation , 2011 .

[9]  Wei Tong,et al.  Fast, Robust and Accurate Digital Image Correlation Calculation Without Redundant Computations , 2013, Experimental Mechanics.

[10]  Xianmin Zhang,et al.  A high accuracy algorithm of displacement measurement for a micro-positioning stage , 2017 .

[11]  D. Sundararajan.  Digital Image Processing , 2017, Springer Singapore.

[12]  John J. Healy,et al.  Terahertz confocal imaging: Polarization and sectioning characteristics , 2020 .