Sciweavers

Share
ICIP
2005
IEEE

Estimating sub-pixel shifts directly from the phase difference

11 years 4 months ago
Estimating sub-pixel shifts directly from the phase difference
In this paper, we establish the exact relationship between the continuous and the discrete phase-difference of two shifted images, and show that their discrete phase difference is a 2-dimensional sawtooth signal. As a result, the exact shifts between two images can be determined to sub-pixel accuracy by counting the number of cycles of the phase difference matrix along each frequency axis. The sub-pixel portion is represented by a fraction of a cycle corresponding to the non-integer part of the shift. The problem is formulated as an over-determined system of equations, and is solved by imposing a regularity constraint, using the method of Generalized Cross Validation (GCV).
Murat Balci, Hassan Foroosh
Added 23 Oct 2009
Updated 27 Oct 2009
Type Conference
Year 2005
Where ICIP
Authors Murat Balci, Hassan Foroosh
Comments (0)
books