Books like Learning OpenCV
Gary Bradski, Adrian Kaehler
Learning OpenCV is 555 pages, about 10 hours 11 minutes at 250 words a minute.
7 books to read next
How long each takes
2001 4.4 h 
Computer and Robot Vision 11.6 h 
Image Analysis and Recognition 12.7 h 
Learning OpenCV 3 18.8 h 
Understanding Machine Learning 7.5 h 
Designing the User Interface 11.6 h 
Observing the User Experience 11.2 h Bar height shows length. Estimated at 250 words a minute.