Patent ID: 7545938
Filing Date: 2009-06-09
Classification: G06T,H04N

Abstract:
1. An apparatus for generating codes, comprising: a processor configured to control operation of respective units of the apparatus; a quantization unit which generates quantization coefficients by performing a discrete wavelet transform with respect to each of tiles into which an image is divided; a block division unit which divides the quantization coefficients into blocks; a hash conversion unit which performs hash conversion based on the quantization coefficients of each of the blocks so as to produce a hash value for each of the blocks; a digital watermark embedding unit which adjusts a parity of a quantization coefficient of interest equal to a parity of the has value of a block to which the quantization coefficient of interest belongs; and coding unit which generates code sequence data by coding the quantization coefficients including said quantization coefficient whose parity is adjusted.