Patent ID: 8611679
Filing Date: 2013-12-17
Classification: G06K

Abstract:
1. An image processing device comprising: a generation unit configured to generate an edge code image based on a gray value of an input image, each element contained in the edge code image including an edge code value and information indicating valid/invalid of the edge code value; a compression unit configured to compress the edge code image by assigning information representing the edge code value for an element having a valid edge code value to an element having an invalid edge code value; a storage unit configured to sequentially store the compressed edge code image; a decompression unit configured to decompress the compressed edge code image stored in the storage unit; and a comparator configured to calculate a similarity degree between the edge code image decompressed by the decompression unit and a model image defined in advance, wherein the compression unit is configured to hold the edge code value generated at every predetermined cycle by the generation unit and the information indicating valid/invalid of the edge code value for a plurality of processing cycles, and output a differential value based on a difference between the edge code value corresponding to the information indicating valid in a previous processing cycle and the edge code value corresponding to the information indicating valid in a current processing cycle as increase/decrease information included in the compressed edge code image.