Fig. 6From: Unsupervised image segmentation for microarray spots with irregular contours and inner holesThe red channel (first column) and green channel (second column) of two spots exemplify two categories of spots: a A perfect spot with preferable spherical and homogeneous intensity distribution. b An irregular spot with high contrast between foreground and background intensity. The spots with spot no. a) 100, and b) 3260 are from microarray ID 20385Back to article page