Machine-Vision Algorithm Learns to Transform Hand-Drawn Sketches Into Photorealistic Images

Drawing an accurate sketch of a person's face is an art that is hard for most people to master. But it turns out to be relatively easy for computers. Various programs exist for converting images into line drawings. That often produces a decent start, although these systems can have difficulty with shadows and high contrast. A more promising approach is to use machine-vision algorithms that rely on neural networks to extract features from an image and use these to produce a sketch.