Much prior work has been done on designing computational geometry algorithms that handle input degeneracies, data imprecision, and arithmetic round-off errors. We take a new approach, inspired by the noisy sorting literature, and study computational geometry algorithms subject to noisy Boolean primitive operations in which, e.g., the comparison "is point q above line 𝓁?" returns the wrong answer with some fixed probability. We propose a novel technique called path-guided pushdown random walks that generalizes the results of noisy sorting. We apply this technique to solve point-location, plane-sweep, convex hulls in 2D and 3D, and Delaunay triangulations for noisy primitives in optimal time with high probability.
@InProceedings{eppstein_et_al:LIPIcs.WADS.2025.24, author = {Eppstein, David and Goodrich, Michael T. and Sridhar, Vinesh}, title = {{Computational Geometry with Probabilistically Noisy Primitive Operations}}, booktitle = {19th International Symposium on Algorithms and Data Structures (WADS 2025)}, pages = {24:1--24:20}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-398-0}, ISSN = {1868-8969}, year = {2025}, volume = {349}, editor = {Morin, Pat and Oh, Eunjin}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.WADS.2025.24}, URN = {urn:nbn:de:0030-drops-242552}, doi = {10.4230/LIPIcs.WADS.2025.24}, annote = {Keywords: Computational geometry, noisy comparisons, random walks} }
Feedback for Dagstuhl Publishing