I will review the tutorial again. To be honest the only reason I mention ‘inches’ (I do understand computer images don’t work in such terms), but I am trying to utilize OpenCV to do a ‘pre-rendering’ stage for an actual ‘real-world’ (i.e. embedded) project and the rotation vector will have these requirements.
In the end it might require a bit of ‘guess and check’, but even your reply, at least it gave me an idea. I could create a ‘typical’ image in Photoshop, add the Y dimensions in inches (and this is why I asked-- at least Photoshop let’s you specify images by physical dimensions at a given resolution-- I wasn’t sure if OpenCV had the same) and then count the number of pixels I’d have to add for the radius. That might work.
Further I do understand this is not a task OpenCV is usually used for, but I am between this and ImageMagick, or just writing my own ‘double-shear’ algorithm… But sometimes, you know, no sense ‘reinventing the wheel’ when you are actually trying to design the cart. If you know a better library to use, let me know.
Best,
-A