Figure 6

Smoothing Analysis. Comparison of the smoothing results obtained with different implementations of the bilateral filter for image D8: Bilateral filter chain (left), fast bilateral filter (right). The bilateral filter chain approach produces much smoother and "round" result, while the fast bilateral filter introduces some distortions due to its implementation with downsampling. The bilateral filter chain detects 200 HC out of user-marked 205, while the fast bilateral filter due to the introduced distortions detects only 192 HC out of 205. However, it does not significantly worsen the detection rates: The bilateral filter chain produces results with sensitivity of 97% and false positive fraction of 13%, while the fast bilateral filter produces results with sensitivity of 94% and false positive fraction of 10%.