Watermark

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Watermark

An image in a piece of paper that may be seen more clearly when it is held up to light. This is used in printing some money and passports to prevent counterfeiting. For example, if one holds a $20 American bill up to light, one would see a watermark of Andrew Jackson's face.

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Figures 8 through 14 show the attacked watermarked images and the corresponding extracted watermarks.

SVD-based image water marking

Perform l-level discrete wavelet transform on the host as well as watermarked image.

The detail and approximation sub-images of the host as well as watermarked image is segmented into nonoverlapping rectangles of size [M.

For embedding, the watermarked primary watermark into the host image, we have used 2-level of decomposition using Daubechies filter bank.

To investigate the robustness of the algorithm, the watermarked image is attacked by Average and Median Filtering, Gaussian noise addition, JPEG and JPEG 2000 compression, Rotation, Resizing, Cropping and Histogram Equalization attacks.

To check the robustness against Image Compression, the watermarked image is tested by JPEG and JPEG 2000 compression attacks.

First, the size of watermarked image is reduced to 128x128 and then again expanded to its original size i.