... Cin the upright im-age when rotating both points about the image centerby−α.(4) Scan the blocks from left to right, top to bottom. Foreach block, find the position of the rotated (about the ... we neither scan the skewed page norrotate the upright image, but use the GT for the upright im-age and the concept of the representative square in order to generate the GTs for the skewed images. ... correspond to clockwise (counterclockwise) rotation),N, and the corresponding block-based UGT, then the SGTgeneration, using the concept of the representative square,consists of the following...