How to work with javaCV?

Question

Java

Tell me, in which direction to dig, you need to find the coordinates of the rectangle in the picture, which is set by another picture (template, the template is part of the main picture)?
And, perhaps, some methods for recognizing letters and numbers?

Answer 1

who is interested, the solution was found
docs.opencv.org/doc/tutorials/imgproc/histograms/t...
maybe someone else will advise?

Answer 2

Good day, if you can, tell us how you installed everything.
I can't figure it out on my own, but I need to.
Is the IDE not important for use?