Title: Method and device for hiding and recovering information
Application Number: 200510086265 Application Date: 2005.08.19
Publication Number: 1917558 Publication Date: 2007.02.21
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04N1/387;G06T1/00;G06C5/00
Applicant(s) Name: Zhongshisilang Electronic Waterprint Tech Co., Ltd Address:
Inventor(s) Name: Songguxin Erlang;Chen Ziting
Attorney & Agent: liang hui qi jianguo
Abstract:
    The method is used to embed secret data into original data with multi frequency-bands and comprises: as preprocess, a canonical transformation is made for the original data with multi frequency-bands; a reversible wavelet transformation is made for the data of at least one of processed components; the secret data is embedded into the high frequency component processed with the reversible wavelet transformation; making wavelet inverse transformation for the component data embedded by the secret data; making inverse transformation for the regular matrix so as to generate multi frequency-bands data used in transmitting message. By the invention, a third party can not know which component data is embedded into the secret data so as to promote the secrecy level, and embedding the secret data into the component data can also make its image quality close to the original image quality.
Time: 7
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