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Method-for-embedding-and-reading-watermark-information-in-digital-form-and-apparatus-thereof

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Method for embedding and reading watermark-information in digital form, and apparatus thereof

Details

Inventors: Nakamura, Takao; Ogawa, Hiroshi; Takashima, Yoichi;
Assignee: Nippon Telegraph and Telephone Corporation (JP)
Primary Examiner: Lee; Thomas D.
Assistant Examiner: Chen; Wenpeng
Attorney, Agent or Firm: Pennie & Edmonds LLP

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.

DETAILED DESCRIPTION It is the object of the present invention to make it possible to read embedded information even if compression processing or compilation processing are performed, and to minimize the deterioration of the digital information even if information has been embedded in the digital information, which have been problems with the technique of embedding the information which can not be perceived by the human senses.
With a view to attaining the above objectives, there is provided a method of embedding information comprising the steps of: dividing data to be processed into fixed size data groups which are called blocks; obtaining coefficients by carrying out orthogonal transformation for each block; determining coefficients in which the watermark-information will be embedded by using a random sequence which is generated by initial value; sequentially embedding the watermark-information, which has arbitrary length of bits, by quantizing value of said coefficients using a predetermined value for quantization; and 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.
Also provided is an apparatus therefor, and a recording medium which stores the information embedding program.
Furthermore, in order to read the information from the data embedded with information by the above-mentioned method, there is provided a method of reading information comprising the steps of: dividing the information-embedded data into blocks; determining coefficients from which the watermark-information will be read by using a random sequence which is generated by initial value which is used at the time of embedding the watermark-information; obtaining the coefficients by carry out orthogonal transformation for each block; sequentially reading each bit of the embedded watermark-information; and outputting the read watermark-information.
Also provided is an apparatus therefor, and a recording medium which stores the information reading program

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