In 2001, Paul Viola and Michael Jones proposed a solution that could work well to answer some of the preceding challenges, but with some constraints. Though it is an almost two decades old algorithm, some of the most popular computer vision software to date, or at least till recently, used to embed it in some form or another. This fact makes it very important to understand this very simple, yet powerful, algorithm before we move on to CNN-based approaches for Region Proposal.
OpenCV, one of the most popular software libraries for computer vision, uses cascading classifiers as the predominant mode for object detection, and Haar-featuring-like Cascade classifier is very popular with OpenCV. A lot of pretrained Haar ...
