Spatial-frequency composite watermarking for digital image copyright protection

Po Chyi Su, C. C.Jay Kuo

研究成果: 雜誌貢獻會議論文同行評審

1 引文 斯高帕斯(Scopus)


Digital watermarks can be classified into two categories according to the embedding and retrieval domain, i.e. spatial- and frequency-domain watermarks. Because the two watermarks have different characteristics and limitations, combination of them can have various interesting properties when applied to different applications. In this research, we examine two spatial-frequency composite watermarking schemes. In both cases, a frequency-domain watermarking technique is applied as a baseline structure in the system. The embedded frequency-domain watermark is robust against filtering and compression. A spatial-domain watermarking scheme is then built to compensate some deficiency of the frequency-domain scheme. The first composite scheme is to embed a robust watermark in images to convey copyright or author information. The frequency-domain watermark contains owner's identification number while the spatial-domain watermark is embedded for image registration to resist cropping attack. The second composite scheme is to embed a fragile watermark for image authentication. The spatial-domain watermark helps in locating the tampered part of the image while the frequency-domain watermark indicates the source of the image and prevents double watermarking attack. Experimental results show that the two watermarks do not interfere with each other and different functionalities can be achieved. Watermarks in both domains are detected without resorting to the original image. Furthermore, the resulting watermarked image can still preserve high fidelity without serious visual degradation.

頁(從 - 到)295-305
期刊Proceedings of SPIE - The International Society for Optical Engineering
出版狀態已出版 - 2000
事件Security and Watermarking of Multimedia Contents II - San Jose, CA, USA
持續時間: 24 1月 200026 1月 2000


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