Figure 2.

The two-dimensional illustration of (a) the one-dimensional quantizer boundaries (dash line) and (b) the userindependent polar quantization boundaries (dash line). The genuine user PDF is in red and the background PDF is in blue. The detection rate and the FAR are the integral of both PDFs in the pink area.

Chen and Veldhuis EURASIP Journal on Information Security 2011 2011:543106   doi:10.1155/2011/543106