Object recognition using OpenCV Cascade Classifier. This app have for purpose to test the precision of the Cascade Classifier recognition easily. The app uses below classifiers: haarcascade_eye. Haarcascade_eye_tree_eyeglasses. Haarcascade_frontalcatface. Haarcascade_frontalcatface_extended. Haarcascade_frontalface_default. Haarcascade_frontalface_alt.