Automatic writer identification using connected-component contours and edge-based features of uppercase Western script

In this paper, a new technique for offline writer identification is presented, using connected-component contours (COCOCOs or CO³s) in uppercase handwritten samples. In our model, the writer is considered to be characterized by a stochastic pattern generator, producing a family of connected components for the uppercase character set. Using a codebook of CO³s from an independent training set of 100 writers, the probability-density function (PDF) of CC´s was computed for an independent test set containing 150 unseen writers. Results revealed a high-sensitivity of the CO³ PDF for identifying individual writers on the basis of a single sentence of uppercase characters. The proposed automatic approach bridges the gap between image-statistics approaches on one end and manually measured allograph features of individual characters on the other end. Combining the CO³ PDF with an independent edge-based orientation and curvature PDF yielded very high correct identification rates.