Degree Name
BS
Department
Computer Science
College
Physical and Mathematical Sciences
Defense Date
2025-03-05
Publication Date
2025-06-04
First Faculty Advisor
Parris Egbert
First Faculty Reader
Ryan Farrell
Honors Coordinator
Seth Holladay
Keywords
Image processing, visual effects, green screen, matting, matte extraction
Abstract
Keying is a fundamental, common, and expensive problem in visual effects. It consists of two subtasks: matte extraction and screen spill removal. Today’s standard keyers often fall short on edge cases including unevenly lit screens, fine detail, and sky replacements. As a result, keying continues to be a laborious process requiring highly trained compositors and complex bespoke setups. Our method does not assume one single saturated screen color, allowing for more versatile workflows. The keyer functions by interpolating over a Delaunay tetrahedralization of user-given sample colors. We evaluate our method relative to the visual effects industry’s standard keyers on a variety of images and footage, achieving comparable or superior results for matting and spill suppression.
BYU ScholarsArchive Citation
Criddle, Isaac J., "Delaunay Keyer for Colorspace-Local Matte Extraction and Spill Suppression" (2025). Undergraduate Honors Theses. 451.
https://scholarsarchive.byu.edu/studentpub_uht/451