초록 ▼

An image is divided into blocks, and different electronic watermark data are embedded into every block using a DCT transformer (103), electronic watermark data inserter (104), and IDCT transformer (107). At that time, reference is made to an electronic watermark data insertion position table (105) a

An image is divided into blocks, and different electronic watermark data are embedded into every block using a DCT transformer (103), electronic watermark data inserter (104), and IDCT transformer (107). At that time, reference is made to an electronic watermark data insertion position table (105) and electronic watermark data table (106) which specify that which electronic watermark data is to be inserted into which block of the image.

대표청구항 ▼

[ What is claimed is:] [1.]1. An electronic watermark data insertion device into a digital image, comprising:an orthogonal transformer which outputs position information of an image block of j.times.k pixels which is taken out from an image and subjected to an orthogonal transformation and data afte

[ What is claimed is:] [1.]1. An electronic watermark data insertion device into a digital image, comprising:an orthogonal transformer which outputs position information of an image block of j.times.k pixels which is taken out from an image and subjected to an orthogonal transformation and data after the orthogonal transformation;an electronic watermark data insertion position table which records into what position of block in the image each of n kinds of electronic watermark data is to be inserted;an electronic watermark data table which stores the n kinds of the electronic watermark data; andan electronic watermark data inserter which takes out an electronic watermark data number from an applicable position of said electronic watermark data insertion position table on the basis of the position information which is outputted by said orthogonal transformer and the electronic watermark data coincident with the taken out electronic watermark data number from said electronic watermark data table to insert the electronic watermark data into data after the orthogonal transformation.