Translational displacement estimation with subpixel accuracy of DCT-sign phase correlation

Abstract

The accuracy of subpixel estimation of Discrete Cosine Transform (DCT) -sign phase correlation (-SPC) is presented using real images involved by actual movement. So far, the accuracy had been reported just using simulated images. Using real images and two types of simulated images, we evaluate the performance with subpixel accuracy of DCT-SPC with curve fitting compared to phase correlation with curve fitting. For real images captured by a commercial-off-the-shelf product camera, the error of estimated value with subpixel accuracy of DCT-SPC with curve fitting is lower than that of phase correlation with curve fitting, although DCT-SPC uses only the signs of DCT coefficients, while phase correlation uses the phase term with complex numbers.