Patent ID: 6327384
Filing Date: 2001-12-04
Classification: G06K

Abstract:
A character recognition apparatus that is used in performing coding of a pattern in accordance with the results of dividing a binary stationary image into patterns and performing pattern matching with respect to each of said divided patterns, said pattern extraction apparatus comprising:projection means for projecting black pixels in said binary stationary image and determining a histogram thereof;document style determining means for determining, in accordance with said histogram, whether said binary stationary image is horizontally written text or vertically written text and for outputting a result of said determination of said document style determining means;means for extracting a block from said image in accordance with said determination result;pattern matching means for performing pattern matching operation by comparing said input pattern with a pattern as stored in a library;coding means for coding said input pattern into coded data depending upon an off-set data and a result of said pattern matching operation;means for extracting a pattern based on said block;means for making a joining judgment which determines whether or not said extracted pattern is extracted as a unitary character;means for joining extracted patterns in accordance with output from said means for making a joining judgment; andmeans for calculating a relative distance between a currently extracted pattern and an immediately previously extracted pattern, as an offset.