Improved Technique for Splitting and Aligning Segments Which Allows a Smaller Shift Window Resulting in Greater Resistance to Forgery Attempts
Original Publication Date: 1985-Jan-01
Included in the Prior Art Database: 2005-Feb-18
The correlation between two signatures is calculated by breaking a signature into segments and applying the regional correlation algorithm to each segment. A segment is defined either by the time the pen was on the paper between physical penlifts, or by artificially produced breaks in the signature at predetermined lengths. Long sections of a signature do not give high correlation scores so they must be broken into smaller segments which are shifted separately. Improved correlation results have been obtained by using all available physical penlift information to align the segments before shifting in order to reduce the number of shifts. Reducing the number of shifts removes freedom from the forger and reduces the computation time.