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《Journal of South China University of Technology(Natural Science Edition)》 2007-01
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Image Content Authentication Technique Based on Laplacian Pyramid

Wo Yan Han Guo-qiang (School of Computer Science and Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China)  
This paper proposes a technique of image content authentication based on the Laplacian pyramid to verify the authenticity of image content.First,the image is decomposed into Laplacian pyramid before the transformation.Next,the smooth and detailed properties of the original image are analyzed according to the Laplacian pyramid,and the properties are classified and encoded to get the corresponding characteristic values.Then,the signature derived from the encrypted characteristic values is embedded in the original image as a watermark.After the reception,the characteristic values of the received image are compared with the watermark drawn out from the image,and the algorithm automatically identifies whether the content is tampered by means of morphologic filtration.The information of tampered location is presented at the same time.Experimental results show that the proposed authentication algorithm can effectively detect the event and location when the original image content is tampered,and can tolerate some distortions produced by compression,filtration and noise degradation.
【Fund】: 国家自然科学基金资助项目(60573019);; 广东省自然科学基金资助项目(05103541);; 广东省自然科学基金博士科研启动基金资助项目(05300198)
【CateGory Index】: TP391.41
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