Patent ID: 6360026
Filing Date: 2002-03-19
Classification: G06K

Abstract:
A method for determining the skew angle of a bitmap image comprised of image pixels and background pixels, comprising the steps of:calculating a first estimate of the skew angle for a first side of the bitmap image and a corresponding first reliability indicator, both the first estimate of the skew angle and the first reliability indicator being based on a first set of plural angles which are calculated at a plurality of positions along the first side, the first set of plural angles being based on the position of image pixels closest to the first side; calculating a second estimate of the skew angle for a second side of the bitmap image and a corresponding second reliability indicator, both the second estimate of the skew angle and the second reliability indicator being based on a second set of plural angles which are calculated at a plurality of positions along the second side, the second set of plural angles being based on the position of image pixels closest to the second side; and determining the skew angle in accordance with which of the first and second estimates has the better reliability indicator.