python opencv3实现人脸识别(windows)
本文实例为大家分享了python人脸识别程序,大家可进行测试
#coding:utf-8
import cv2
import sys
from PIL import Image
def CatchUsbVideo(window_name, camera_idx):
cv2.namedWindow(window_name)
# 视频来源,可以来自一段已存好的视频,也可以直接来自USB摄像头
cap = cv2.VideoCapture(camera_idx)
# 告诉OpenCV使用人脸识别分类器
classfier = cv2.CascadeClassifier("C:\\opencv\\build\\etc\\haarcascades\\haarcascade_frontalface_alt2.xml")
# 识别出人脸后要画的边框的颜色,RGB格式
color = (0, 255, 0)
while cap.isOpened():
ok, frame = cap.read() # 读取一帧数据
if not ok:
break
# 将当前帧转换成灰度图像
grey = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
# 人脸检测,1.2和2分别为图片缩放比例和需要检测的有效点数
faceRects = classfier.detectMultiScale(grey, scaleFactor=1.2, minNeighbors=3, minSize=(32, 32))
if len(faceRects) > 0: # 大于0则检测到人脸
for faceRect in faceRects: # 单独框出每一张人脸
x, y, w, h = faceRect
cv2.rectangle(frame, (x - 10, y - 10), (x + w + 10, y + h + 10), color, 3) #5控制绿色框的粗细
# 显示图像
cv2.imshow(window_name, frame)
c = cv2.waitKey(10)
if c & 0xFF == ord('q'):
break
# 释放摄像头并销毁所有窗口
cap.release()
cv2.destroyAllWindows()
if __name__ == '__main__':
CatchUsbVideo("FaceRect", 0)
# if len(sys.argv) != 2:
# print("Usage:%s camera_id\r\n" % (sys.argv[0]))
# else:
# CatchUsbVideo("识别人脸区域", int(sys.argv[1]))
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