Image Registration: Color Image Synthesis from Data Obtained from Satellites Pushbroom Cameras

The problem of image registration is discussed. Firstly, the well known Reddy-Chatterji algorithm is revised. It is shown that the speed may be dramatically increased by using Hartley transform instead of Fourier transform, especially when registration is re-quired for more than two images. Secondary, a new registration algorithm is proposed for images obtained from pushbroom cam-eras that is based on Hartley transform and fast Hough (Radon) transform. The issue of aliasing and artifacts suppression is treated. Two cases have been considered: approximately linear correlated spectral bands and without this assumption. Registra-tion obtained is refined with optical flow technique up to subpixel accurac