python-攝像頭實現人臉追蹤

本例例用人臉特徵庫實現電腦攝像頭實時追蹤人臉。相關知識見前面博客 

python-計算機視覺-OpenCV-人臉特徵提取

python-計算機視覺-OpenCV-Image

python-計算機視覺-OpenCV-video

下面是代碼實例：

import cv2
cap = cv2.VideoCapture(0) 
face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_alt2.xml') # 加載人臉特徵庫
face_cascade.load(r'D:\python\myTest\face\haarcascade_frontalface_alt2.xml')
while(True):
    ret, frame = cap.read() # 讀取一幀的圖像
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) # 轉灰
 
    faces = face_cascade.detectMultiScale(gray, scaleFactor = 1.15, minNeighbors = 5, minSize = (5, 5)) # 檢測人臉
    for(x, y, w, h) in faces:
        cv2.rectangle(gray, (x, y), (x + w, y + h), (0, 255, 0), 2) # 用矩形圈出人臉
 
    cv2.imshow('Face Recognition', gray)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
cap.release() # 釋放攝像頭
cv2.destroyAllWindows()