6th International Conference on Signal Processing, Beijing, China, 26 - 30 August 2002, pp.813-816
The 2-D phase correlation and the 2-D cepstrum technique are known as two solutions to the translation-based image registration problem. However, both methods have a large computational load; Satisfactory results [7] were obtained in a smaller translation range by applying phase correlations to the 1D projections of images to reduce the computational load. This paper presents a new algorithm based on the application of the cepstrum technique to the image projections in a similar way. An enhanced cepstrum technique is developed by subtracting the cepstrum of the projection differences from the cepstrum of the projection additions. A superior performance compared to that of the 1-D phase correlation can be obtained by whitening the power spectrum by the square-root instead of the logarithm and using a high-pass filter afterwards. The algorithm yields larger translation ranges in registering noisy images and remarkably outperforms the phase correlation in the case of different degrees of blurring between images.