A Novel Fractional-Discrete-Cosine-Transform-Based Reversible Watermarking for Healthcare Information Management Systems

<table>Extraction of the watermark, <svg height="11.875" id="M79" style="vertical-align:-0.20474pt" version="1.1" viewbox="0 0 17.125 11.875" width="17.125" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.55)"><use xlink:href="#x1D416"></use></g>
</svg>, from the watermarked image, <svg height="14.8625" id="M80" style="vertical-align:-2.4024pt" version="1.1" viewbox="0 0 25.625 14.8625" width="25.625" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.813)"><use xlink:href="#x1D410"></use></g><g transform="matrix(.017,-0,0,-.017,13.288,11.813)"><use xlink:href="#x1D415"></use></g>
</svg>, based on the conventional QIM scheme.</table>

Mathematical Problems in Engineering

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Figure 5

Figure 5: A Novel Fractional-Discrete-Cosine-Transform-Based Reversible Watermarking for Healthcare Information Management Systems 