Patent ID: 6606393
Filing Date: 2003-08-12
Classification: G06T

Abstract:
A method of generating a message authentication code comprising:receiving a plurality of blocks of image data, each block corresponding to a particular one of a plurality of rows and a particular one of a plurality of columns of an image; generating a row histogram for each particular one of the plurality of rows, the row histogram representing values in blocks corresponding to the particular one of the plurality of rows; generating a row representation from each row histogram, the row representation corresponding to the particular one of the rows from which the row histogram was formed; generating a column histogram for each particular one of the plurality of columns, the column histogram representing values in blocks corresponding to the particular one of the plurality of columns; generating a column representation from each column histogram, the column representation corresponding to the particular one of the columns from which the column histogram was formed; and generating a message authentication code comprising the plurality of row representations and the plurality of column representations.