Giménez Silva Germán AlbertoRuby Sees the World.
Place a credit card in a photo. Ruby finds it, calibrates the scale, and measures everything else in the frame.
Door: 2.1m. Window: 1.2m. Wall: 8.0m.
Hough transform + Sobel (native C) + ruby-libgd.
https://rubystacknews.com/2026/03/23/ruby-sees-the-world-automatic-measurement-from-photos/
Ruby Sees the World: Automatic Measurement from Photos
Ruby Sees the World: Automatic Measurement from Photos March 23, 2026 Published on RubyStackNews What if Ruby could look at a photo of a house and tell you the width of the door, the height of the …