Underwater Acoustic Image Encoding Based on Interest Region and Correlation Coefficient

<table class="fixed-width table-group" id="tab3"><tr><td><table class="table"><colgroup><col style="width:10.19em"/><col style="width:10.19em"/><col style="width:10.19em"/><col style="width:7.20em"/><col style="width:3.67em"/><col style="width:8.72em"/></colgroup><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr class="thead"><td class="align_left"> </td><td class="align_center">The number of 4 × 4 blocks</td><td class="align_center">The number of 8 × 8 blocks</td><td class="align_center">Encoding time</td><td class="align_center">PSNR</td><td class="align_center">Compression ratio</td></tr><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td class="align_left">Improved quadtree algorithm</td><td class="align_center">3996</td><td class="align_center">25</td><td class="align_center">186.35</td><td class="align_center">30.18</td><td class="align_center">5.53</td></tr><tr><td class="align_left" colspan="6"><hr/></td></tr><tr><td class="align_left">Proposed algorithm</td><td class="align_center">1128</td><td class="align_center">742</td><td class="align_center">3.02</td><td class="align_center">28.77</td><td class="align_center">13.87</td></tr><tr class="table-tr"><td colspan="6"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Comparison of improved quadtree algorithm with the proposed algorithm.</div>

Complexity

tab3

Table 3

Table 3: Underwater Acoustic Image Encoding Based on Interest Region and Correlation Coefficient 