A New Adaptive Edge Enhancement Algorithm for Color Laser Printers

This paper presents a novel algorithm for improving the quality of edges in printed text. The algorithm is designed to add pixels at selected edge locations post halftoning. The extent of the correction is proportional to the "strength" of the edge, as determined by comparing the local differences in a four-pixel neighborhood to a dynamically generated threshold. The process is computationally efficient and requires minimal memory resources. The performance of our proposed algorithm is clearly demonstrated on several characters and lines. While the algorithm aims to improve the quality of printed text (edges), it is possible to extend its application to improvement of any edge identifiable in image documents.