Epipolar geometry

Epipolar Geometry is a way of understanding how we can use light and cameras to measure the 3-dimensional world. Here's how it works:

When a light beam (like a flashlight), hits an object, it reflects off the object and bounces in all directions. The light that reaches our eyes or a camera creates an image of the object. This image will have lines (called epipolar lines) that help us measure the object's size and place in the 3D world.

To measure how long or far away an object is, we take two pictures of the same object. But when we take the second picture, we move the camera a bit to the side. Now, when we look at the two pictures, we see that the lines that connected the same points in each picture (called epipolar lines) did not stay the same. This tells us the object's size or how far away it was.

Epipolar geometry helps us measure the 3D world and create 3D models!