On Block-based Image Watermarking
D.V.S. Chandra (USA)
Keywords
Watermarking, multimedia security, copyright protection,
block-based techniques, robustness
Abstract
In this paper, we describe a class of block-based wa
termarking techniques for embedding logos and pseudo
random number sequences into digital images. We also
present a novel block-based watermark embedding scheme
using singular value decomposition. These methods al
low direct embedding and extraction of watermarks on bit
streams in the compressed domain and also provide local
control which allows embedding of the watermark adap
tively based on the local visual characteristics. Simulation
results are provided which demonstrate the robustness of
the proposed watermarking technique to a variety of com
mon image degradations.
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