Document image contrast method, document image contrast and apparatus for computer-readable recording medium

摘要

A fast, memory efficient, and accurate document image matching system is disclosed. Document image matching is based on identifying anchor points of characters in the document. The document matching process includes a feature extraction step where anchor points, e.g., points representing approximate locations of characters, are identified as features for matching. In a particularly efficient implementation, the anchor points are "pass codes" in a two dimensionally encoded representation of a document image.