Learning OpenCV 4 Computer Vision with Python 3 - Third Edition

Performing face detection on a video

We now understand how to perform face detection on a still image. As mentioned previously, we can repeat the process of face detection on each frame of a video (be it a camera feed or a pre-recorded video file).

The next script will open a camera feed, read a frame, examine that frame for faces, and scan for eyes within the detected faces. Finally, it will draw blue rectangles around the faces and green rectangles around the eyes. Here is the script in its entirety:

import cv2face_cascade = cv2.CascadeClassifier(    './cascades/haarcascade_frontalface_default.xml')eye_cascade = cv2.CascadeClassifier(    './cascades/haarcascade_eye.xml')camera = cv2.VideoCapture(0)while (cv2.waitKey(1) == -1): success, frame ...