A graphic arts image is partitioned into two-dimensional geometrically related pictorial entities known as "blobs" which are susceptible of identification by a number of parameters. An entire picture is scanned, a line at a time, and encoded with variable length Elias and Huffman codes, where the Huffman...http://www.google.com.tw/patents/US4107648?utm_source=gb-gplus-share專利 US4107648 - Scan encoding of two dimensional pictorial entities
