Watermark applied to one-dimensional data
Номер патента: EP1052612A4
Опубликовано: 18-09-2002
Автор(ы): Kineo Matsui, Munetoshi Iwakiri
Принадлежит: Kowa Co Ltd
Опубликовано: 18-09-2002
Автор(ы): Kineo Matsui, Munetoshi Iwakiri
Принадлежит: Kowa Co Ltd
Реферат: In the process of embedding watermark information in one-dimensional source data, first spread one-dimensional data x(t) is generated by subjecting one-dimensional source data s(t) to spectrum-spreading operation using a PN sequence g(t). This first spread one-dimensional data x(t) then undergoes a modified discrete cosine transformation. A specific frequency component value of the MDCT coefficients is modulated to provide association with the watermark information. The modulated frequency component then undergoes inverse transformation to generate second spread one-dimensional data x'(t). Then, using the same PN sequence in the spreading, the second spread one-dimensional data is subjected to spectrum-despreading to produce digitally watermarked one-dimensional data in which watermark data has been embedded. <IMAGE>
Watermark applied to one-dimensional data
Номер патента: EP1052612B1. Автор: Kineo Matsui,Munetoshi Iwakiri. Владелец: Matsui Kineo. Дата публикации: 2006-06-07.