opencv人臉追蹤

Haar-cascade Detection 

OpenCV中已經包含了許多預訓練的分類臉部，眼睛，微笑等，這些XML文件存儲在opencv/data/haarcascades/文件夾中。

本次實驗所需兩個XML檔

臉部

http://jviolajones.googlecode.com/files/haarcascade_frontalface_default.xml

眼睛

http://cascade-collection.googlecode.com/files/haarcascade_eye.xml

import numpy as np
import cv2

face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml')

img = cv2.imread('face.jpg')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

faces = face_cascade.detectMultiScale(gray, 1.3, 3)
for (x,y,w,h) in faces:
    img2 = cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)
    roi_gray = gray[y:y+h, x:x+w]
    roi_color = img[y:y+h, x:x+w]
    eyes = eye_cascade.detectMultiScale(roi_gray)
    for (ex,ey,ew,eh) in eyes:
     cv2.rectangle(roi_color,(ex,ey),(ex+ew,ey+eh),(0,255,0),2)

cv2.imshow('img',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

參考資料：
http://opencv-python-tutroals.readthedocs.org/en/latest/py_tutorials/py_objdetect/py_face_detection/py_face_detection.html#face-detection
https://realpython.com/blog/python/face-recognition-with-python/
http://stackoverflow.com/questions/29316590/face-detection-using-haar-opencv-python