How to find the 3D coordinates of 3 images (top, fron, side) of a cube?

With given images of a cube (used edge detection), how do I find the 3D coordinates that correspond to some pixels?

For example if I choose a white pixel in the first image, how do you find the corresponding pixel in the other images?

The main goal is to calculate the volume of a cube, from just 3 pictures.

[Abhishek Gupta]

Can you elaborate with a sample image?

If the object is a cube, then you can calculate the volume by determining the length of one edge from just one picture with the front face.