Patent ID: 6453054
Filing Date: 2002-09-17
Classification: G06K

Abstract:
A method of recognizing sequences of numerals, comprising the following steps:generating a screen image of the numeral sequence; deriving a linear representation of the numeral sequence from the screen image; estimating writing lines; subdividing the linear representation into horizontally-overlapping frames, which are in turn subdivided into a plurality of vertically-superposed regions; determining features of the line segments extending in the region as components of a feature vector, separately for the regions within each frame; supplying the feature vectors of horizontally-consecutive frames to an HMM identifier as a vector sequence, wherein an upper line, a lower line and a center line are estimated as writing lines from the linear representation; selecting as vertically-superposed regions of the linear representation; a region encompassing the upper writing line, a region encompassing the lower writing line, and a region encompassing the center writing line, with the bordering regions overlapping the vertically and, in addition, the region that encompasses the center writing line being subdivided into a portion above the center writing line and a portion beneath the center writing line, in which partial regions only the diagonal features of the line segments extending therein are determined.