A Color Image Digital Watermarking Scheme Based on SOFM
Digital watermarking technique has been presented and widely
researched to solve some important issues in the digital world,
such as copyright protection, copy protection and content
authentication. Several robust watermarking schemes based on
vector quantization (VQ) have been presented. In this paper, we
present a new digital image watermarking method based on
SOFM vector quantizer for color images. This method utilizes
the codebook partition technique in which the watermark bit is
embedded into the selected VQ encoded block. The main feature
of this scheme is that the watermark exists both in VQ
compressed image and in the reconstructed image. The
watermark extraction can be performed without the original
image. The watermark is hidden inside the compressed image, so
much transmission time and storage space can be saved when the
compressed data are transmitted over the Internet. Simulation
results demonstrate that the proposed method has robustness
against various image processing operations without sacrificing
compression performance and the computational speed.
Keywords: self organizing feature map, digital watermarking,
vector quantization, codebook partition, color image
compression
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