python-opencv 人脸检测

代码还使用到了dlib 和face_recognition这两个库，需要安装一下，看一下代码：

import face_recognition
import cv2# 创建视频捕捉对象
video_capture = cv2.VideoCapture(0)
print(video_capture.isOpened())# video_capture.set(3, 1280)
# video_capture.set(4, 480)while video_capture.isOpened():# ret 表示读取是否成功# frame 具体的图像数据ret, frame = video_capture.read()# 尺寸缩放为原来的 1/4# 作用：为了加速人脸检测过程small_frame = cv2.resize(frame, None, fx=0.25, fy=0.25)# bgr -> rgbrgb_frame = small_frame[:, :, ::-1]# 拿到人脸坐标face_loc = face_recognition.face_locations(rgb_frame)for (top, right, bottlm, left), in zip(face_loc):top *= 4right *= 4bottlm *= 4left *= 4cv2.rectangle(frame,(left, top),(right, bottlm),(255, 0, 0),2)cv2.imshow("face detection", frame)# 退出条件if cv2.waitKey(1) & 0xFF == 27:breakvideo_capture.release()
cv2.destroyAllWindows()