Python 对图片进行人脸识别

import cv2

def detect(path):
    img = cv2.imread(path)
    cascade = cv2.CascadeClassifier("/vagrant/detect/haarcascade_frontalface_alt.xml")#xml文件路径一定要注意
    rects = cascade.detectMultiScale(img, 1.3, 4, cv2.cv.CV_HAAR_SCALE_IMAGE, (20,20))

    if len(rects) == 0:
        return [], img
    rects[:, 2:] += rects[:, :2]
    return rects, img

def box(rects, img):
    for x1, y1, x2, y2 in rects:
        cv2.rectangle(img, (x1, y1), (x2, y2), (127, 255, 0), 2)
    cv2.imwrite('/vagrant/img/detected.jpg', img);

rects, img = detect("/vagrant/img/one.jpg")
box(rects, img)

以上是源码，来自：

http://fideloper.com/facial-detection

依赖：

$ sudo apt-get update
$ sudo apt-get install -y vim build-essential python-software-properties    # The Basics
$ sudo apt-get install -y python-opencv python-numpy python-scipy        # OpenCV items

$ wget http://eclecti.cc/files/2008/03/haarcascade_frontalface_alt.xml