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《Journal of Logistical Engineering University》 2004-02
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The Digital Watermark Technique Based on Discrete Cosine Transform

DONG Rui - yu ; WANG Yu - zhu;LIU Qian;SHEN Xiao - dong (Dept . of Logistical Automatic Eng . ,LEU,Chongqing 400016,China)  
Under the opening NT environment, the requirements of the authority and of digital works, the digital watermark is becoming increasingly important. As the previous embedding methods have some defects, we present a digital watermarking image method based on DCT. It makes the watermark perceptually invisible and there is few loss of relevant information of the original image. By using the properity of DCT, watermarking image is robust against attack, such as translation and cropping. And it can be retrieved with a high degree of accuracy by a secret key.
【CateGory Index】: TP309
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Chinese Journal Full-text Database 10 Hits
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9 KONG Xin yi (Language Lab of Foreign Language College,Liaoning Normal University,Dalian 116029,China);Toward the Best Types of Language Laboratories Used for EFL Teaching[J];Journal of Liaoning Normal University(Natural Science Edition);2002-02
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