Patent ID: 6915001
Filing Date: 2005-07-05
Classification: G06T

Abstract:
1. An electronic watermarking system, for embedding additive information in digital data, for which one frame is defined as including N samples extracted from digital data and a current frame is defined as a frame that is overlapped by M samples (0<M≦N/2) of a preceding frame, comprising: (1) a frequency domain transformation unit, for multiplying a frame extracted from digital data by a window function, and for using the results to perform a Fourier transform and thus obtain a frequency component for said digital data; (2) a frequency domain embedding unit, for employing bit information for additive information, and a frequency band for said frequency component to change the amplitude of said frequency component in said digital data obtained by said frequency domain transformation unit; (3) a time domain transformation unit, for performing an inverse Fourier transform to return, to a time domain signal, said frequency component whose amplitude has been changed by said frequency domain embedding unit; and (4) an additive information embedding frame generator, for multiplying, by a window function, said time domain signal obtained by said time domain transformation unit, and for superimposing overlapped frames to generate a frame wherein said additive information is embedded.