A comparison of FFT and DCT based Phase Correlation function for focused and defocused images

Abstract

The paper presents a comparison study between DCT and FFT based Phase Correlation techniques to estimate translational shifts in focused and defocused images. Though FFT based techniques are efficient for motion estimation, considering real-time implementation, DCT based techniques are simpler and computationally efficient. Experimental results with simulated focused and defocused images show comparable results to FFT's both in pixel and sub-pixel levels.