Figure 3. Perspective projection of the 800 large-norm data points in the simulation dataset onto the 2-D intersection of the convex cone formed by the data points.

Perspective projection performs simple positive scaling of data points to make every data point have unit element sum. Black dots are data points. Each data point is connected to its sector central ray by a line. Red circles indicate the edges detected by applying the lateral edge detection algorithm on the sector central rays. Blue diamond markers indicate the positions of true mixing matrix column vectors. The three edges that minimize the model fitting error among all three-edge sets are indicated by arrows.