Coded document and document reading system

Abstract

A coded document is provided for use in a document reading system having a plurality of markable areas defined thereon and a first and second coded pattern disposed in predetermined relation to the markable areas. Each of the coded patterns has an identical predefined signature when viewed from any direction. A coded document reader includes a video camera that captures the image carried on the coded document. Pixel data is stored in a memory corresponding to the document area scanned by the video camera. The stored data is analyzed to identify detected signatures corresponding to the coded pattern signatures. Based on the location of the identified detected signatures and stored data defining the positions of the markable locations relative to the coded patterns, the position within the stored data of each of the markable locations on the card is determined.

Dependencies are inferred from the claim text.