Tensor-directed simulation of strokes for image stylization with hatching and contours

We describe a simple but capable algorithm to generate sketches from color images. The method is based on the drawing of dark strokes on a white background, directed by an image-dependent tensor-valued geometry. It is able to produce various sketching styles with different kind of hatching and contours. Combining these grayscale sketches with the colors of the input images allows to produce a wide variety of image stylization renderings.