Robust labeling methods for copy protection of images

Gerhard C. Langelaar; Jan C. A. van der Lubbe; Reginald L. Lagendijk

doi:10.1117/12.263418

15 January 1997 Robust labeling methods for copy protection of images

Gerhard C. Langelaar, Jan C. A. van der Lubbe, Reginald L. Lagendijk

Proceedings Volume 3022, Storage and Retrieval for Image and Video Databases V; (1997) https://doi.org/10.1117/12.263418
Event: Electronic Imaging '97, 1997, San Jose, CA, United States

Abstract

In the European project SMASH a mass multimedia storage device for home usage is being developed. The success of such a storage system depends not only on technical advances, but also on the existence of an adequate copy protection method. Copy protection for visual data requires fast and robust labeling techniques. In this paper, two new labeling techniques are proposed. The first method extends an existing spatial labeling technique. This technique divides the image into blocks and searches an optimal label- embedding level for each block instead of using a fixed embedding-level for the complete image. The embedding-level for each block is dependent on a lower quality JPEG compressed version of the labeled block. The second method removes high frequency DCT-coefficients in some areas to embed a label. A JPEG quality factor and the local image structure determine how many coefficients are discarded during the labeling process. Using both methods a perceptually invisible label of a few hundred bits was embedded in a set of true color images. The label added by the spatial method is very robust against JPEG compression. However, this method is not suitable for real-time applications. Although the second DCT-based method is slightly less resistant to JPEG compression, it is more resistant to line-shifting and cropping than the first one and is suitable for real-time labeling.

Citation Download Citation

Gerhard C. Langelaar, Jan C. A. van der Lubbe, and Reginald L. Lagendijk "Robust labeling methods for copy protection of images", Proc. SPIE 3022, Storage and Retrieval for Image and Video Databases V, (15 January 1997); https://doi.org/10.1117/12.263418

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