October 2016
Intermediate to advanced
558 pages
12h 39m
English
Content preview from OpenCV: Computer Vision Projects with PythonBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Appendix B. Generating Haar Cascades for Custom Targets
This appendix shows how to generate Haar cascade XML files like the ones used in Chapter 4, Tracking Faces with Haar Cascades. By generating our own cascade files, we can potentially track any pattern or object, not just faces. However, good results might not come quickly. We must carefully gather images, configure script parameters, perform real-world tests, and iterate. A lot of human time and processing time might be involved.
Gathering positive and negative training images
Do you know the flashcard pedagogy? It is a method of teaching words and recognition skills to small children. The teacher shows the class a series of pictures and says the following:
"This is a cow. Moo! This is a horse. ...
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