초록 ▼

An apparatus for embedding information comprises: a blocking step for dividing data to be processed into blocks; an orthogonal transform step for obtaining coefficients by carrying out orthogonal transformation for each block; an embedding coefficient selecting step for determining coefficients in w

An apparatus for embedding information comprises: a blocking step for dividing data to be processed into blocks; an orthogonal transform step for obtaining coefficients by carrying out orthogonal transformation for each block; an embedding coefficient selecting step for determining coefficients in which the watermark-information will be embedded by using a random sequence which is generated by initial value; an information embedding step for sequentially embedding the watermark-information, which has arbitrary length of bits, by quantizing value of said coefficients using a predetermined value for quantization; and an inverse orthogonal transform step for carrying out inverse orthogonal transformation for modified coefficients to form block in which the watermark-information is embedded, as well as combining the divided blocks and reconstructing the original form.

대표청구항 ▼

[ What is claimed is:] [1.] A method of embedding information comprising:a blocking step for dividing original data into blocks;an orthogonal transform step for obtaining coefficients by performing an orthogonal transformation for each block;an embedding coefficient selecting step for determining co

[ What is claimed is:] [1.] A method of embedding information comprising:a blocking step for dividing original data into blocks;an orthogonal transform step for obtaining coefficients by performing an orthogonal transformation for each block;an embedding coefficient selecting step for determining coefficients in which watermark-information will be embedded by using a random sequence which is generated by initial value;an information embedding step for sequentially embedding watermark-information, which has arbitrary length of bits, by quantizing value of said coefficients using a predetermined value for quantization; andan inverse orthogonal transform step for carrying out inverse orthogonal transformation for embedded coefficients and non-embedded coefficients to form a block in which the watermark-information is embedded, as well as combining embedded blocks and to reconstruct data which is homogeneous to the original data form,wherein in said orthogonal transform step said orthogonal transform is a three dimensional orthogonal transform, and in said inverse orthogonal transform step, said inverse orthogonal transform is a three dimensional inverse orthogonal transform,in said information embedding step, the entropy of the data value of the block to be processed is utilized for determining said predetermined value for quantization; andin said inverse orthogonal transform step, when the orthogonal transform coefficient obtained by said information embedding step is inverse orthogonal transformed, processing is further performed so that the value after the inverse orthogonal transform does not exceed a defined range of pixel values of the original data form.