cleanup code following https://stackoverflow.com/questions/45868943/convert-node-array-variable-lenght-to-a-const-float-to-call-opencv-calchist/45870887#45870887
cleanup code following https://stackoverflow.com/questions/45868943/convert-node-array-variable-lenght-to-a-const-float-to-call-opencv-calchist/45870887#45870887

piercus/node-opencv,piercus/node-opencv,peterbraden/node-opencv,piercus/node-opencv,piercus/node-opencv,peterbraden/node-opencv,piercus/node-opencv,piercus/node-opencv,peterbraden/node-opencv,peterbraden/node-opencv