You should perform a non-invertible blur though... Or even easier, use the same noise image for all faces. EDIT: come to think of it, you can generate random n

You should perform a non-invertible blur though... Or even easier, use the same noise image for all faces. EDIT: come to think of it, you can generate random noise using a palette from the color in the blur area (say, take four or five colors and mix them). Applying convolutional blur for anonymizing is very very risky. Because you might end up with something either invertible or nearly so.