1. Learning OpenCV: Computer vision with the OpenCV library;Bradski,2008
2. Measuring apple size distribution from a near top–down image;Butters,2019
3. Imaging basics: Calculating lens focal length;Chouinard,2015
4. Imaging Basics: Calculating resolution for machine vision;Chouinard,2015
5. Fruit count, fruit weight, and yield relationships in ‘Delicious’ apple trees on nine rootstock;Elfving;HortScience,1993