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For OpenCV tests.

Understanding the whole library is a tremendous task in my opinion. Rather, I would start by:

• sticking on a specific topic / module you like or used many times
• maybe looking / solving for bugs or documentation issues could be a start.

In general, the modules are made to be related to a specific computer vision topic (imgproc module for image processing, calid3d for camera calibration and stereovision, ...).

One module is used everywhere (the core module) or for almost everywhere (image reading, etc.).

If you have an improvement in mind could be a start. The doc is a start also. There is also a new book: Learning OpenCV 3.