网上有很多关于Python+opencv人脸检测的例子,并大都附有源程序。但是在实际使用时依然会遇到这样或者那样的问题,在这里给出常见的两种问题及其解决方法。
先给出源代码:(如下)
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import cv2 import numpy as np cv2.namedWindow( "test" ) cap = cv2.VideoCapture( 0 ) success,frame = cap.read() classifier = cv2.CascadeClassifier( "haarcascade_frontalface_alt.xml" ) while success: success,frame = cap.read() size = frame.shape[: 2 ] image = np.zeros(size,dtype = np.float16) image = cv2.cvtColor(frame,cv2.cv.CV_BGR2GRAY) cv2.equalizeHist(image,image) divisor = 8 h,w = size minSize = (w / divisor,h / divisor) faceRects = classifier.detectMultiScale(image, 1.2 , 2 ,cv2.CASCADE_SCALE_IMAGE,minSize) if len (faceRects)> 0 : for faceRect in faceRects: x,y,w,h = faceRect cv2.circle(frame,(x + w / 2 ,y + h / 2 ), min (w / 2 ,h / 2 ),( 255 , 0 , 0 )) cv2.circle(frame,(x + w / 4 ,y + h / 4 ), min (w / 8 ,h / 8 ),( 255 , 0 , 0 )) cv2.circle(frame,(x + 3 * w / 4 ,y + h / 4 ), min (w / 8 ,h / 8 ),( 255 , 0 , 0 )) cv2.rectangle(frame,(x + 3 * w / 4 ,y + 3 * h / 4 ),(x + 5 * w / 8 ,y + 7 * h / 8 ),( 255 , 0 , 0 )) cv2.imshow( "test" ,frame) key = cv2.waitKey( 10 ) c = chr (key& 255 ) if c in [ 'q' , 'Q' , chr ( 27 )]: break cv2.destroyWindow( "test" ) |
运行后出现问题一:
Traceback (most recent call last):
File “E:/facepy/m.py”, line 14, in
image=cv2.cvtColor(frame,cv2.cv.CV_BGR2GRAY)
AttributeError: module ‘cv2.cv2' has no attribute ‘cv'
解决方法:
cv2.cv.CV_BGR2GRAY是Opencv 2.x的变量,在Opencv 3.3中无法识别,所以应该替换成:
image=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
修改完成后,继续运行,又出现问题二:
Traceback (most recent call last):
File “E:/facepy/m.py”, line 19, in
faceRects=classifier.detectMultiScale(image,1.2,2,cv2.CASCADE_SCALE_IMAGE,minSize)
TypeError: integer argument expected, got float
解决方法:
由于minSize传到detectMultiScale函数的值不是整数导致的导致出现错误,所以这里我们需要强制转换minSize的值为整数: minSize =(w//divisor, h//divisor) 或者 minSize=(int(w/divisor),int(h/divisor))
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/mumu_1233/article/details/77898759