Patent ID: 6415042
Filing Date: 2002-07-02
Classification: G06T

Abstract:
A digital image coding apparatus for recording a signature image on a host image using watermarking, comprising:a first discrete wavelet transform portion operative to receive a host image to be transmitted and perform a discrete wavelet transform thereon, thereby outputting MÃ—M discrete wavelet coefficients where M is a predetermined positive integer; an original signature image storage portion operative to store an image, which is suitable to performance of an analysis of variance (ANOVA) technique, as an original signature image; a second discrete wavelet transform portion operative to receive the original signature image and perform a discrete wavelet transform thereon to obtain NÃ—N wavelet coefficients, N being another predetermined integer smaller than M; and a coefficient replacement/combination portion operative to replace and combine NÃ—N location data with MÃ—M wavelet coefficients selected among MÃ—M wavelet coefficients in accordance with a predetermined rule to then output the NÃ—N location data and replaced MÃ—M wavelet coefficients.