First; Thank you for considering this project. This project is the first of two. The first and most important feature is to develop an app that will apply accurate measurements to objects in a still photo.  Pictures are anticipated to be of interior and exterior residential construction.  The critical measurements will relate to the dimensions of rooms, doors, windows and cabinets (square items).
Ideally the app will automatically identify square objects and apply measurements to straight edges that have terminal ends within the photo such as a window where the entire width is visible. Being able to apply a 1 square foot grid to flat surfaces would be a bonus but not necessary at this stage. I believe accurate measurements are based on knowing the size of a reference item within the picture.  I anticipate being able to put a partially opened measuring tape in each picture but would also like to be able to use a common item such as a quarter, dollar bill or a standard piece of paper. The app will hopefully be…