Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsFinding the Vanishing Points of Sample Imageshttp://demonstrations.wolfram.com/FindingTheVanishingPointsOfSampleImages/]]>http://demonstrations.wolfram.com/FindingTheVanishingPointsOfSampleImages/