Patent ID: 8472716
Filing Date: 2013-06-25
Classification: G06K,G06T

Abstract:
1. A method of detecting noise in an image of a compound document, the image comprising pixels representing at least text data and image data used to form the compound document, the noise comprising at least one of halftone, bleeding and texture noise, the method comprising the steps of: (a) partitioning the image into a plurality of tiles each formed of a plurality of pixels; (b) determining a set of dominant colors for each of the tiles and associating each pixel with one of the determined dominant colors to form a plurality of dominant color regions; (c) determining, for each of the dominant color regions, a fragmentation statistic representing a fragmentation of the dominant color region, the fragmentation statistic including an edge ratio of a border pixel count to a number of pixels of the dominant color; and (d) applying a threshold to each of said fragmentation statistics of the dominant color regions to detect the at least one of halftone, bleeding and texture noise in the corresponding dominant color in the tile.