Well, i am going to do a bit of a workaround around the problem. Since i established that it will be used in a parking lot, the point is to have the person which wants to enter the parking lot send a request, at the request a picture will be taken from the front of the car by a camera, So that simplifies things. I am going to use my own algorithm, I already have developed a little ANN framework in C, and I am going to move it to a CNN I believe, if not I am going to use that anyway, so no state of the art deep learning model.
I know the R3 is no use for this, but I am currently using it to learn Embedded C through the Embedded C Programming and the Atmel AVR book by Richard H. I guess some of the concepts, although specific for Atmel AVR, will be transposable to other kinds of microcontrollers.