Sepearable 2D EDT, going to extend to 3D in order to calculate the Signed Distance Function(Field)
Cost 0.75s to generate the SDF at 768^2
Brute-forced Euclid Distance Transform,布布扣,bubuko.com
Brute-forced Euclid Distance Transform
原文地址：http://www.cnblogs.com/Jedimaster/p/3753499.html
