Figure 4From: Homology-based method for detecting regions of interest in colonic digital imagesThe non-ROI false-positive example (artifacts). (a) Folded sample: In the folded area, because the sample is overlapped, the homology values are high. (b) Numerical artifact: For normalization, we divide the Betti numbers in a ratio of non-blank area. If the non-blank ration is very small, the normalized result is very high.Back to article page