OpenCV 3.0 Computer Vision with Java

Cascade classifier detection and training

One might be wondering how OpenCV could detect faces as this would be a very straightforward task for a couple-of-month old baby, and it looks quite complicated to tell a computer how to accomplish it. We will divide the problem in two parts—object detection, which is applying a classifier and retrieving the object position when the classifier says so, and training a new classifier to learn new objects that should be mostly rigid.

OpenCV Cascade Classifier initially implemented a face-detection technique known as the Viola-Jones detector, first developed by Paul Viola and Michael Jones, which uses the so-called Haar-like features, named after Alfréd Haar wavelets. These features are based on thresholds ...