Patent ID: 6351439
Filing Date: 2002-02-26
Classification: G06T,G11B,H04N

Abstract:
A method for managing access to data by utilizing management information comprising a plurality of bits embedded in the data through data transformation without changing the amount of the data, the method comprising the steps of:defining a plurality of sets of data regions in the data for the plurality of bits to be embedded in the data, each of the data regions in each set having at least one pixel and the data regions in each set being in mutually high characteristic correlation with each other; comparing characteristic values between the data regions in each set and embedding a bit of the plurality of bits in each set of data regions by expressing the bit as a function of the characteristic values comparison and a value of the bit; extracting the plurality of bits of the management information embedded in the data by comparing the characteristic values between the data regions in the defined plurality of sets; and managing access to said data according to said extracted management information.