1. A digital imaging system, comprising: a digital image capture device configured to generate a scan image that digitally represents an input document positioned in a scan area; an image processor configured to receive and process said scan image in real-time, wherein said image processor includes an input document edge detection system, an input document corner detection system, an input document skew calculation system and an input document shear calculation system; and an output processor configured to provide registration information for said input document, said input document edge detection system further comprising: a slow scan processor electronically linked to a lead edge detector and a trail edge detector, said lead edge detector being configured to detect a scan image scanline corresponding to an input document lead edge and said trail edge detector being configured to detect a scan image scanline corresponding to an input document trail edge; and a fast scan processor electronically linked to a side edge detector and configured to detect a scan image scanline corresponding to an input document left edge and to detect a scan image scanline corresponding to an input document right edge.