WebGL Stipple image generator
First, given a source image, a Voronoi Diagram is generated. In short, using a specific number of points, the given space is divided into the same number of regions as points using specific guidelines. The result is a Voronoi Diagram. These points will be used to create a stipple image.
Using the algorithms described in the paper, the Voronoi Diagram is iteratively converted to be "centroidal". That is, all the points are located at the centroid of their respective regions. However, these centroids are weighted based off the pixel density of the source image. This means that darker areas of the source image will have more points, and thus more stipples.