[英]Python: TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'
I tried executing the following code for facial recognition in python and got the error as mentioned, what could be the possible cause and what is a solution?我尝试在 python 中执行以下代码进行面部识别并得到如上所述的错误,可能的原因是什么,解决方案是什么?
code:代码:
import cv2
import numpy as np
from os import listdir
from os.path import isfile, join
data_path ='/Users/aksheenmalhotra/Desktop/facerecogdata/'
onlyfiles = [f for f in listdir(data_path) if isfile(join(data_path,f))]
Training_Data, Labels = [], []
for i, files in enumerate(onlyfiles):
image_path = data_path + onlyfiles[i]
images = cv2.imread(image_path, cv2.IMREAD_GRAYSCALE)
Training_Data.append(np.asarray(images,dtype=np.uint8))
Labels.append(i)
Labels = np.asarray(Labels, dtype=np.int32)
model = cv2.face.LBPHFaceRecognizer_create()
model.train(np.asarray(Training_Data), np.asarray(Labels))
print("Model Training Complete!!!!!")
face_classifier = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
def face_detector(img, size = 0.5):
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
faces = face_classifier.detectMultiScale(gray,1.3,5)
if faces is():
return img,[]
for(x,y,w,h) in faces:
cv2.rectangle(img, (x,y),(x+w,y+h),(0,255,255),2)
roi = img[y:y+h, x:x+w]
roi = cv2.resize(roi, (200,200))
return img,roi
cap = cv2.VideoCapture(0)
while True:
ret, frame = cap.read()
image, face = face_detector(frame)
try:
face = cv2.cvtColor(face, cv2.COLOR_BGR2GRAY)
result = model.predict(face)
if result[1] < 500:
confidence = int(100*(1-(result[1])/300))
display_string = str(confidence)+'% Confidence it is user'
cv2.putText(image,display_string,(100,120), cv2.FONT_HERSHEY_COMPLEX,1,(250,120,255),2)
if confidence > 75:
cv2.putText(image, "Unlocked", (250, 450), cv2.FONT_HERSHEY_COMPLEX, 1, (0, 255, 0), 2)
cv2.imshow('Face Cropper', image)
else:
cv2.putText(image, "Locked", (250, 450), cv2.FONT_HERSHEY_COMPLEX, 1, (0, 0, 255), 2)
cv2.imshow('Face Cropper', image)
except:
cv2.putText(image, "Face Not Found", (250, 450), cv2.FONT_HERSHEY_COMPLEX, 1, (255, 0, 0), 2)
cv2.imshow('Face Cropper', image)
pass
if cv2.waitKey(1)==13:
break
cap.release()
cv2.destroyAllWindows()
I get the following error traceback.我收到以下错误回溯。 Error:
错误:
Traceback (most recent call last):
File "/Users/aksheenmalhotra/Desktop/python files/18-1-2020/facerecogtrial.py", line 14, in <module>
Training_Data.append(np.asarray(images,dtype=np.uint8))
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/numpy/core/_asarray.py", line 85, in asarray
return array(a, dtype, copy=False, order=order)
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'
I can reproduce the error message with:我可以通过以下方式重现错误消息:
In [210]: np.asarray(None, dtype='uint8')
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-210-ab1b7ff4c0ab> in <module>
----> 1 np.asarray(None, dtype='uint8')
/usr/local/lib/python3.6/dist-packages/numpy/core/_asarray.py in asarray(a, dtype, order)
83
84 """
---> 85 return array(a, dtype, copy=False, order=order)
86
87
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'
Thus, in因此,在
images = cv2.imread(image_path, cv2.IMREAD_GRAYSCALE)
Training_Data.append(np.asarray(images,dtype=np.uint8))
images
is, most likely, None
. images
很可能是None
。 cv2.imread
returns None
when it can't read the file, most likely because the file path is wrong. cv2.imread
无法读取文件时返回None
,很可能是因为文件路径错误。
So a robust use of cv2
should be prepared for this, and test for None
, and skip or raise an error.因此,应该为此做好充分使用
cv2
准备,并测试None
,并跳过或引发错误。
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