A Study on Weak Edge Detection of COVID-19’s CT Images Based on Histogram Equalization and Improved Canny Algorithm

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static-preview.hindawi.com/articles/cmmm/volume-2021/5208940/figures/5208940.fig.007a.svgz" name="5208940.fig.007a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>The Canny algorithm</td></tr><tr class="fig-image" id="b"><td><object data="https://static-preview.hindawi.com/articles/cmmm/volume-2021/5208940/figures/5208940.fig.007b.svgz" name="5208940.fig.007b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>The HMS algorithm</td></tr><tr class="fig-image" id="c"><td><object data="https://static-preview.hindawi.com/articles/cmmm/volume-2021/5208940/figures/5208940.fig.007c.svgz" name="5208940.fig.007c" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(c) </b>The ETAR algorithm</td></tr><tr class="fig-image" id="d"><td><object data="https://static-preview.hindawi.com/articles/cmmm/volume-2021/5208940/figures/5208940.fig.007d.svgz" name="5208940.fig.007d" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(d) </b>The proposed algorithm</td></tr></table>

<div>Comparison of the detection of diffuse ground-glass shadow in both lungs.</div>

Computational and Mathematical Methods in Medicine

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Figure 7

Figure 7: A Study on Weak Edge Detection of COVID-19’s CT Images Based on Histogram Equalization and Improved Canny Algorithm 