properties
- projections of parallel 3d lines intersect at a vanishing point
- projections of parallel 3d planes intersect at a vanishing line
- vanishing point ←> 3d direction of a line
- vanishing line ←> 3d orientation of a surface
calculating points
- get edges with Canny edge detector
- use RANSAC or Hough Transform to get lines
- use RANSAC again in pixel space to count intersections
calculating lines
- calculate camera intrinsics
- given a pair of vanishing points, …
- a pair of vanishing points gives 1 equation
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related