English: Mosaicing of two document images. In the overlap region the pixels are blended, using an unweighted mean at the centre of the region and increasingly weighted means towards the edges. This blending operation eliminates any abrupt seams in the mosaic, but will result in a blurred composite if the registration is not accurate. Blurring is evident in the affine mosaic (b), but not in the mosaic constructed using a plane-to-plane projectivity (a). Close-ups of typical seams from (a) and (b) are shown in (c) and (d) respectively. Note the system’s ability to cope with mixtures of fonts and unaligned columns.