Digital watermark in digital images and e-books. Why digital watermarking? What is digital watermark? Perceptible and unperceptible watermarks.

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Presentation transcript:

Digital watermark in digital images and e-books

Why digital watermarking? What is digital watermark? Perceptible and unperceptible watermarks

Embedding and detection Watermark properties: - Detectability - Fidelity Optimal embedding strength

Digital watermark for grayscale images spread spectrum technique AWGN (additive white Gaussian noise) watermark. Optimal embedding strength - normal distribution properties. Optimal embedding strength for lossy compressed image Digital watermark and color image Each color image is three grayscale images combination

Watermark for e-books Our Virtual library Electronic book (e-book) e-book format (PDF, DjVu) PDF books - classes: E-books produced by scanning; E-books originated from DOC or TeX files; PDF file pages need at first to be converted to bitmaps; watermarking is possible, but not robust enough.

Unwatermarked PDF page Watermarked PDF page (‘Faculty of Mathematics Belgrade’)