Systems and methods for registering hemispheric images obtained using a
fisheye lens for panoramic viewing, relating to spatial alignment and
colour balancing of complement half-side images derived from the
hemispheric images. The systems and methods for spatial alignment
determine the displacement of the digitized recorded images using a
single translation and rotation model of distortion, which further
evaluates the centre of projection, and the extent of translation and
rotation. The system and method for colour balancing iteratively increase
(or decrease) the values of pixels near the edge (discontinuity) between
the two half-sides of an image, each time taking into consideration the
average difference of pixel colour across a smaller strip of the edge
near the pixel. This invention removes the colour differential but does
not remove any detail underlying the features of the image.