如何解决运行opencv示例时出现“功能/功能未实现”错误
运行以下代码时出现以下错误:
import cv2,sys,numpy,os
haar_file = 'haarcascade_frontalface_default.xml'
datasets = 'datasets'
print('Recognizing Face Please Be in sufficient Lights...')
(images,lables,names,id) = ([],[],{},0)
for (subdirs,dirs,files) in os.walk(datasets):
for subdir in dirs:
names[id] = subdir
subjectpath = os.path.join(datasets,subdir)
for filename in os.listdir(subjectpath):
path = subjectpath + '/' + filename
lable = id
images.append(cv2.imread(path))
lables.append(int(lable))
id += 1
(width,height) = (130,100)
(images,lables) = [numpy.array(lis) for lis in [images,lables]]
model = cv2.face.LBPHFaceRecognizer_create()
model.train(images,lables) # error comes here
face_cascade = cv2.CascadeClassifier(haar_file)
webcam = cv2.VideoCapture(0)
while True:
(_,im) = webcam.read()
gray = cv2.cvtColor(im,cv2.COLOR_BGR2GRAY)
faces = face_cascade.detectMultiScale(gray,1.3,5)
for (x,y,w,h) in faces:
cv2.rectangle(im,(x,y),(x + w,y + h),(255,0),2)
face = gray[y:y + h,x:x + w]
face_resize = cv2.resize(face,(width,height))
prediction = model.predict(face_resize)
cv2.rectangle(im,(0,255,3)
if prediction[1]<500:
cv2.putText(im,'% s' %
(names[prediction[0]]),(x-10,y-10),cv2.FONT_HERSHEY_PLAIN,1,0))
else:
cv2.putText(im,'not recognized',0))
cv2.imshow('OpenCV',im)
key = cv2.waitKey(10)
if key == 27:
break
cv2.destroyAllWindows()
弹出的错误是:
Traceback (most recent call last):
File "Y:\vigyantram\AI-20200807T104521Z-001\AI\img processing1\face_recognize.py",line 19,in <module>
model.train(images,lables)
cv2.error: OpenCV(4.3.0) C:\projects\opencv-python\opencv_contrib\modules\face\src\lbph_faces.cpp:265: error: (-213:The function/feature is not implemented) Using Original Local Binary Patterns for feature extraction only works on single-channel images (given 16). Please pass the image data as a grayscale image! in function 'cv::face::elbp'?
谢谢。
解决方法
这可以解决问题。使用大小(宽度和高度)的8或16的倍数,如果它不起作用,请告知我需要将测试图像和训练图像都转换为灰色,尝试也可以。
import cv2,sys,numpy,os
haar_file = 'haarcascade_frontalface_default.xml'
datasets = 'datasets'
print('Recognizing Face Please Be in sufficient Lights...')
(images,lables,names,id) = ([],[],{},0)
for (subdirs,dirs,files) in os.walk(datasets):
for subdir in dirs:
names[id] = subdir
subjectpath = os.path.join(datasets,subdir)
for filename in os.listdir(subjectpath):
path = subjectpath + '/' + filename
lable = id
images.append(cv2.imread(path))
lables.append(int(lable))
id += 1
(width,height) = (200,200) #here 200 is multiple of 8
(images,lables) = [numpy.array(lis) for lis in [images,lables]]
model = cv2.face.LBPHFaceRecognizer_create()
model.train(images,lables) #error comes here
face_cascade = cv2.CascadeClassifier(haar_file)
webcam = cv2.VideoCapture(0)
while True:
(_,im) = webcam.read()
gray = cv2.cvtColor(im,cv2.COLOR_BGR2GRAY)
faces = face_cascade.detectMultiScale(gray,1.3,5)
for (x,y,w,h) in faces:
cv2.rectangle(im,(x,y),(x + w,y + h),(255,0),2)
face = gray[y:y + h,x:x + w]
face_resize = cv2.resize(face,(width,height))
prediction = model.predict(face_resize)
cv2.rectangle(im,(0,255,3)
if prediction[1]<500:
cv2.putText(im,'% s' %
(names[prediction[0]]),(x-10,y-10),cv2.FONT_HERSHEY_PLAIN,1,0))
else:
cv2.putText(im,'not recognized',0))
cv2.imshow('OpenCV',im)
key = cv2.waitKey(10)
if key == 27:
break
cv2.destroyAllWindows()
,
我知道该怎么做。
images.append(cv2.imread(path,0))
必须添加“ 0”。
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