what is done is actually the following this is how people actually come up with features in computer vision this kind of notional illustrative example but this is what I wanna do when I take my motorcycle I make I'm going to detect edges at four different orientations so look for vertical edges horizontal edges 45-degree ages 135 degree edges and then what this number or point seven and the upper right means right that number is saying that the density of vertical edges in the upper right hand quadrant of my image is 0.7 and