We present an interactive system for creating pen-and-ink-style line drawings from greyscale images in which the strokes of the renderedillustrationfollowthefeaturesoftheoriginalimage. The user, via new interaction techniquesforeditingadirectionfield, specifies anorientationforeachregionoftheimage; thecomputerdrawsorientedstrokes, basedonauser-specifiedsetofexamplestrokes,that achieve the same tone as the image via a new algorithm that compares anadaptively-blurred version ofthecurrent illustrationtothe targettoneimage. By aligning the direction field with surface orientations of the objects in the image, the user can create textures that appear attached to those objects instead of merely conveying their darkness. The result is a more compelling pen-and-ink illustration thanwas previously possible from 2D reference imagery.

We present an interactive system for creating pen-and-ink illustrations. The system uses stroke textures—collections of strokes arranged in different patterns—to generate texture and tone. The user “paints ” with a desired stroke texture to achieve a desired tone, and the computer draws all of the individual strokes. The system includes support for using scanned or rendered images for reference to provide the user with guides for outline and tone. By following these guides closely, the illustration system can be used for interactive digital halftoning, in which stroke textures are applied to convey details that would otherwise be lost in this blackand-white medium. By removing the burden of placing individual strokes from the user, the illustration system makes it possible to create fine stroke work with a purely mouse-based interface. Thus, this approach holds promise for bringing high-quality black-and-white illustration to the world of personal computing and desktop publishing.

This paper describes a representation for pen-and-ink illustrations that allows the creation of high-fidelity illustrations at any scale or resolution. We represent a pen-and-ink illustration as a low-resolution grey-scale image, augmented by a set of discontinuity segments, along with a stroke texture. To render an illustration at a particular scale, we first rescale the grey-scale image to the desired size and then hatch the resulting image with pen-and-ink strokes. The main technical contribution of the paper is a new reconstruction algorithm that magnifies the low-resolution image while keeping the resulting image sharp along discontinuities.

We present a method for rendering 3D models in the traditional line−drawing style used in artistic and scientific illustrations. The goal is to suggest the 3D shape of the object using a small number of lines drawn with carefully chosen line qualities. The system combines several known techniques into a simple yet effective non−photorealistic line renderer. Feature edges related to the outline and interior of a given 3D mesh are extracted, segmented, and smoothed, yielding chains of lines with varying path, length, thickness, gaps and enclosures. The paper includes sample renderings obtained for a variety of models.

We present a method for rendering 3D models in the traditional line-drawing style used in artistic and scientific illustrations. The goal is to suggest the 3D shape of the objects using a small number of lines drawn with carefully chosen line qualities. The system combines several known techniques into a simple yet effective non-photorealistic line renderer. Feature edges related to the outline and interior of a given 3D mesh are extracted, segmented, and smoothed, yielding chains of lines with varying path, length, thickness, gaps, and enclosures. The paper includes sample renderings obtained for a variety of models. 1.