关键词:  , 视频对象； 对象水印； Radon变换； SA-DCT； 几何变换

Abstract:

One of the key points of the MPEG-4 standard is the possibility to access and manipulate objects within a video sequence, but it increases the demand for information security protection and multimedia authentication technologies. An object based watermarking algorithm is proposed, which can correctly access the data embedded in the object. To resist against scaling and rotation attacks, two generalized Radon transformations are used. The watermark is embedded in the quantized SA-DCT coefficients. Experiments show that the algorithm is lowdistortion, robust to geometry transformation attacks. And the algorithm can integrate with the MPEG-4 codec very well. 

Key words: video object, objects watermarking, radon transformations, SA-DCT, geometric transformation