Expressive line selection by example

Eric B. Lum, Kwan-Liu Ma

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


An important problem in computer generated line drawing is determining which set of lines produces a representation that is in agreement with a user's communication goals. We describe a method that enables a user to intuitively specify which types of lines should appear in rendered images. Our method employs conventional silhouette-edge and other feature-line extraction algorithms to derive a set of candidate lines, and integrates machine learning into a user-directed line removal process using a sketching metaphor. The method features a simple and intuitive user interface that provides interactive control over the resulting line selection criteria and can be easily adapted to work in conjunction with existing line detection and rendering algorithms. Much of the method's power comes from its ability to learn the relationships between numerous geometric attributes that define a line style. Once learned, a user's style and intent can be passed from object to object as well as from view to view.

Original languageEnglish (US)
Pages (from-to)811-820
Number of pages10
JournalVisual Computer
Issue number8-10
StatePublished - Sep 1 2005


  • Example-based rendering
  • Machine learning
  • Non-photorealistic rendering
  • Silhouettes

ASJC Scopus subject areas

  • Software
  • Education
  • Human-Computer Interaction
  • Computer Vision and Pattern Recognition
  • Computer Science Applications
  • Computer Graphics and Computer-Aided Design


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