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Straightforward, yes. Straightforward enough to write a blog post explaining step by step for someone new to the field.

I suppose my point was that there is no shortage of information on the method either. For example, searching for "how to measure distance from camera" yields many results detailing the same method. Anyway, it doesn't really matter, it's a well written post, just nothing terribly interesting or new.

This tutorial blog posts acknowledges that.

> in general, determining the distance from a camera to a marker is actually a very well studied problem in the computer vision/image processing space.

Agreed, it's certainly not novel. Although I personally find it interesting to see the source code behind these solutions and how the pieces are glued together.