What is the best lib to use in java for computer vision (image-in-image search)?

Question

Java

And so, there is one big picture in this case, this is a screenshot of the screen
task:
1) find a certain area in the screenshot from the picture
(for example, this is a certain label, but the image of the label from the database does not have to be the same resolution of the label from the screenshot)
and also find out the coordinates of the location of this area
2 ) in another specific area, find all the rectangles (they are strictly oriented and ordered)
then find this image (from the rectangle) in a certain image database, the resolution of images from the database may differ from the resolution of images from the screenshot
3) recognition of numbers, they are of the same printed font, contrasting colors
to complete the tasks, I decided to use opencv, but I didn’t understand the documentation because all the code examples were in C,
tell me which one is better to use and the docks for it (or at least a mini example in java)
or tell me how this can be implemented using opencv)
ps . development is under Windows using swing
ps2. this article was found robocraft.ru/blog/computervision/3046.html
but half of the methods in the openCV version for java are simply not there

Answer 1

OpenCV is great.
All methods are available for both Java and Python, and for C ++ they can simply be called differently.

Answer 2

javacv - wrapper for opencv

Answer 3

The advice is correct. Use OpenCV. If there is no new functionality in Java bindings yet, just forward it yourself through JNI.