%T Metric Measurements on a Plane from a Single Image %A Micah K. Johnson %A Hany Farid %R Technical Report TR2006-579 %I Dartmouth College, Computer Science %C Hanover, NH %D August 2006 %U http://www.cs.dartmouth.edu/reports/TR2006-579.pdf %X The past decade has seen considerable advances in the application of principles from projective geometry to problems in image analysis and computer vision. In this paper, we review a subset of this work, and leverage these results for the purpose of forensic analysis. Specifically, we review three techniques for making metric measurements on planar surfaces from a single image. The resulting techniques should prove useful in forensic settings where real-world measurements are required.