A digital watermarking scheme that preserves image quality and is applicable to watermark sequences from a variety of distributions
✍ Scribed by Takashi Tachibana; Masaaki Fujiyoshi; Hitoshi Kiya
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 397 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0882-1666
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✦ Synopsis
Abstract
We propose a method for performing digital watermarking that can preserve image quality by enabling the degradation of image quality to be automatically constrained when the objective is to embed a watermark within a moving image sequence in real time. The proposed method is always able to create a watermarked image with the desired level of image quality (peak to signal noise ratio; PSNR). In addition, the method is a nonreference digital watermarking scheme in that it does not require the original image for the watermark to be extracted after embedding in an image. Existing digital watermarking methods guaranteeing image quality are restricted in their application to watermark components consisting of real‐valued terms that form a normalized distribution. Our method, on the other hand, removes such constraints and can be applied to watermark sequences from a variety of distributions. In addition, with the proposed method it is possible to remove the embedded watermark without explicitly extracting the watermark sequence and it is also possible to improve the image quality as a result. In simulations where we embed a binary sequence from a uniform distribution as a watermark into images, we confirm that image quality is preserved and that image quality can be improved when the watermark is removed. © 2006 Wiley Periodicals, Inc. Syst Comp Jpn, 37(8): 90–100, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/scj.20257