Two Eyes, Depth

Seeing distance through disparity

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Disparity d = fB/Z: nearer objects shift more between two views.
• Depth error grows like Z²: stereo is best up close.
• Stellar parallax is stereo vision with Earth’s orbit as the baseline.

Steps

1. Two slightly different pictures
2. The thumb test
3. A robot’s eyes
4. Fuzzy at a distance
5. How precise?
6. Stereo for stars