DFRFT: A Classified Review of Recent Methods with Its Application

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="214650.fig.003a" src="https://static.hindawi.com/articles/je/volume-2013/214650/figures/214650.fig.003a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Cover image</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="214650.fig.003b" src="https://static.hindawi.com/articles/je/volume-2013/214650/figures/214650.fig.003b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>Secret image</td></tr></table></td></tr><tr class="fig-image" id="c"><td><img alt="214650.fig.003c" src="https://static.hindawi.com/articles/je/volume-2013/214650/figures/214650.fig.003c.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(c) </b>
								Steganography Image</td></tr></table></td></tr><tr class="fig-image" id="d"><td><img alt="214650.fig.003d" src="https://static.hindawi.com/articles/je/volume-2013/214650/figures/214650.fig.003d.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(d) </b>Retrieved secret image at <svg height="11.825" id="M315" style="vertical-align:-3.27605pt" version="1.1" viewbox="0 0 15.0625 11.825" width="15.0625" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,7.675)"><path d="M483 97q-42 -50 -88.5 -79.5t-68.5 -29.5q-37 0 -17 93l22 102h-2q-54 -79 -144 -149q-59 -46 -100 -46q-24 0 -43 29t-19 86q0 78 34.5 153t94.5 120q41 31 94 51.5t98 20.5q29 0 72 -9q26 -6 39 -6l2 -4q-30 -117 -67 -323q-8 -41 2 -41q16 0 79 58zM374 387
q-32 15 -73 15q-52 0 -83 -23q-48 -36 -78 -108.5t-30 -152.5q0 -33 8.5 -50.5t20.5 -17.5q31 0 107 79t99 132q15 40 29 126z" id="x1D44E"></path></g>
<g transform="matrix(.012,-0,0,-.012,8.663,11.762)"><path d="M384 0h-275v27q67 5 81.5 18.5t14.5 68.5v385q0 38 -7.5 47.5t-40.5 10.5l-48 2v24q85 15 178 52v-521q0 -55 14.5 -68.5t82.5 -18.5v-27z" id="x31"></path></g>
</svg> = −0.2</td></tr></table></td></tr><tr class="fig-image" id="e"><td><img alt="214650.fig.003e" src="https://static.hindawi.com/articles/je/volume-2013/214650/figures/214650.fig.003e.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(e) </b>Retrieved secret image at <svg height="11.825" id="M316" style="vertical-align:-3.27605pt" version="1.1" viewbox="0 0 15.0625 11.825" width="15.0625" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,7.675)"><path d="M483 97q-42 -50 -88.5 -79.5t-68.5 -29.5q-37 0 -17 93l22 102h-2q-54 -79 -144 -149q-59 -46 -100 -46q-24 0 -43 29t-19 86q0 78 34.5 153t94.5 120q41 31 94 51.5t98 20.5q29 0 72 -9q26 -6 39 -6l2 -4q-30 -117 -67 -323q-8 -41 2 -41q16 0 79 58zM374 387
q-32 15 -73 15q-52 0 -83 -23q-48 -36 -78 -108.5t-30 -152.5q0 -33 8.5 -50.5t20.5 -17.5q31 0 107 79t99 132q15 40 29 126z" id="x1D44E"></path></g>
<g transform="matrix(.012,-0,0,-.012,8.663,11.762)"><path d="M384 0h-275v27q67 5 81.5 18.5t14.5 68.5v385q0 38 -7.5 47.5t-40.5 10.5l-48 2v24q85 15 178 52v-521q0 -55 14.5 -68.5t82.5 -18.5v-27z" id="x31"></path></g>
</svg> = −0.4</td></tr></table></td></tr><tr class="fig-image" id="f"><td><img alt="214650.fig.003f" src="https://static.hindawi.com/articles/je/volume-2013/214650/figures/214650.fig.003f.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(f) </b>Retrieved secret image at <svg height="11.825" id="M317" style="vertical-align:-3.27605pt" version="1.1" viewbox="0 0 15.0625 11.825" width="15.0625" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,7.675)"><path d="M483 97q-42 -50 -88.5 -79.5t-68.5 -29.5q-37 0 -17 93l22 102h-2q-54 -79 -144 -149q-59 -46 -100 -46q-24 0 -43 29t-19 86q0 78 34.5 153t94.5 120q41 31 94 51.5t98 20.5q29 0 72 -9q26 -6 39 -6l2 -4q-30 -117 -67 -323q-8 -41 2 -41q16 0 79 58zM374 387
q-32 15 -73 15q-52 0 -83 -23q-48 -36 -78 -108.5t-30 -152.5q0 -33 8.5 -50.5t20.5 -17.5q31 0 107 79t99 132q15 40 29 126z" id="x1D44E"></path></g>
<g transform="matrix(.012,-0,0,-.012,8.663,11.762)"><path d="M384 0h-275v27q67 5 81.5 18.5t14.5 68.5v385q0 38 -7.5 47.5t-40.5 10.5l-48 2v24q85 15 178 52v-521q0 -55 14.5 -68.5t82.5 -18.5v-27z" id="x31"></path></g>
</svg> = −0.22</td></tr></table></td></tr></table>

<table>Steganography using DFRFT.</table>

Journal of Engineering

fig3

Figure 3

Figure 3: DFRFT: A Classified Review of Recent Methods with Its Application 