0、建立项目文件夹
G:\Python_work\face_detect
在“face_detect”文件夹中建立“generate.py”、“check_image.py”、“face_recognition.py”文件
以及“data”、“cascades”文件夹；“cascades”文件夹中包含各类人脸检测的XML文件，如：“haarcascade_eye.xml”
“haarcascade_frontalface_default.xml”文件等；在“data”文件夹内建立“ChenXiaoHan”“WuLiJing”“YuTao”子文件夹（可依据人名自行设置）；
1、生成人脸识别数据（代码）
import cv2
import os
path=r'G:\Python_work\face_detect\cascades'
def generate():
face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
face_cascade.load(path+'\haarcascade_frontalface_default.xml')
eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml')
eye_cascade.load(path+'\haarcascade_eye.xml')
camera = cv2.VideoCapture(0)
count = 0
while(True):
ret,frame = camera.read()
gray = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
faces = face_cascade.detectMultiScale(gray,1.3,5)
for (x,y,w,h) in faces:
img = cv2.rectangle(frame,(x,y),(x+w,y+h),(255,0,0),2)
f=cv2.resize(gray[y:y+h,x:x+w],(200,200))
cv2.imwrite(r'.\data\YuTao\%s.pgm' % str(count),f)
count += 1
cv2.imshow("camera",frame)
if cv2.waitKey(1) & 0xff == ord("q"):
break
camera.release()
cv2.destroyAllWindows()
if __name__ == "__main__":
generate()
2、查看训练数据集（代码）
import cv2
img = cv2.imread(r"G:\Python_work\face_detect\data\YuTao\0.pgm",
cv2.IMREAD_GRAYSCALE)
print(img)
cv2.imshow('img',img)
cv2.waitKey()
cv2.destroyAllWindows()
3、人脸识别（代码）
import cv2
import os
import sys
import numpy as np
def read_images(path,sz=None):
c=0
X,y = [],[]
for dirname,dirnames,filenames in os.walk(path):
for subdirname in dirnames:
for filename in os.listdir(subject_path):
try:
if not filename.endswith('.pgm'):
continue
filepath = os.path.join(subject_path,filename)
im = cv2.imread(os.path.join(subject_path,filename),
cv2.IMREAD_GRAYSCALE)
if(sz is not None):
im = cv2.resize(im,(200,200))
X.append(np.asarray(im,dtype=np.uint8))
y.append(c)
except (IOError,(errno,strerror)):
print("I/O error({0}):{1}".format(errno,strerror))
except:
print("Unexcepted error:",sys.exc_info()[0])
raise
c=c+1
return[X,y]
def face_rec(img_path):
if __name__ == "__main__":