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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