Fig. 7
From: A geometric method for contour extraction of Drosophila embryos
A concave-shape embryo vs. touching embryos. a A scenario where the contour of a Drosophila is a bean shape that contains two inflection points. The angles of two inflection points are obtuse. b A scenario where the two hollow dots represent the two intersections between the contours of two touching Drosophila embryos, and their angles are acute