I'm sizing the effort for building an app that allows us to make measurements in the field using just a digital camera .
I will be using either a supplied or custom marker, but only to measure, not for AR functions.
Most directly I will be using just marker detection and making measurements from those markers against walls using a jpg image source from a digital camera.
Capturing the photo and completing the measurements will most probably be out process from one another.
Is this the best choice for a library; or is there a project that more directly addresses this need?