Python OpenCV NoneType 对象没有属性形状
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OpenCV NoneType object has no attribute shape
提问by user3748265
Hello I'm working on Raspberry Pi with OpenCV. I want to try a tutorial which is ball tracking in link http://www.pyimagesearch.com/2015/09/14/ball-tracking-with-opencv/
您好，我正在使用 OpenCV 开发 Raspberry Pi。我想尝试一个教程，它是链接http://www.pyimagesearch.com/2015/09/14/ball-tracking-with-opencv/ 中的球跟踪
But when I compile it, i get an error: 'NoneType' object has no attribute 'shape'.
但是当我编译它时，我收到一个错误：'NoneType' 对象没有属性 'shape'。
What should I do?
我该怎么办？
回答by asc11
It means that somewhere a function which should return a image just returned None and therefore has no shape attribute. Try "print img" to check if your image is None or an actual numpy object.
这意味着应该返回图像的函数在某处返回 None ，因此没有 shape 属性。尝试“打印 img”以检查您的图像是 None 还是实际的 numpy 对象。
回答by Deepak V
I faced the same problem today, please check for the path of the image as mentioned by cybseccrypt. After imread, try printing the image and see. If you get a value, it means the file is open.
我今天遇到了同样的问题，请检查cybseccrypt提到的图像路径。imread 后，尝试打印图像并查看。如果您得到一个值，则表示该文件已打开。
Code:
代码：
img_src = cv2.imread('/home/deepak/python-workout/box2.jpg',0)
print img_src
img_src = cv2.imread('/home/deepak/python-workout/box2.jpg',0)
print img_src
Hope this helps!
希望这可以帮助！
回答by aysebilgegunduz
You probably get the error because your video path may be wrong in a way. Be sure your path is completely correct.
您可能会收到错误消息，因为您的视频路径可能在某种程度上是错误的。确保您的路径完全正确。
回答by Sir Tesla
try to handle the error, its an attribute error given by OpenCV
尝试处理错误，它是 OpenCV 给出的属性错误
try:
img.shape
print("checked for shape".format(img.shape))
except AttributeError:
print("shape not found")
#code to move to next frame
回答by sachinsaini
This is because the path of image is wrong or the name of image you write is incorrect .
这是因为图像路径错误或您写入的图像名称错误。
how to check? first try to print the image using print(img) if it prints 'None' that means you have given wrong image path correct that path and try again.
如何检查？首先尝试使用 print(img) 打印图像，如果它打印“无”，则意味着您提供了错误的图像路径，更正该路径，然后重试。
回答by Son Tran Hoang
I just meet a same problem. I solve it by updating the newest version of OpenCV. It works well with me. Hope it is also ok with you.
我只是遇到同样的问题。我通过更新最新版本的 OpenCV 来解决它。它对我很有效。希望你也没事。
回答by Santhosh Dhaipule Chandrakanth
Hope this helps anyone facing same issue
希望这可以帮助任何面临相同问题的人
To know exactly where has occurred, since the running program doesn't mention it as a error with line number
要确切知道发生的位置，因为正在运行的程序没有将其作为行号错误提及
'NoneType' object has no attribute 'shape'
'NoneType' object has no attribute 'shape'
Make sure to add assertafter loading the image/frame
确保在加载assert后添加image/frame
For image
对于图像
image = cv2.imread('myimage.png')
assert not isinstance(image,type(None)), 'image not found'
For video
对于视频
cap = cv2.VideoCapture(0)
while(cap.isOpened()):
# Capture frame-by-frame
ret, frame = cap.read()
if ret:
assert not isinstance(frame,type(None)), 'frame not found'
Helped me solve a similar issue, in a long script
帮我解决了一个类似的问题，在一个很长的脚本中
回答by Khelina Fedorchuk
I work with artificially created images,i.e. I create them by myself and then train a neural network on them to perform a certain task. So, I created these images, saved them, but when I tried to open them ( with cv2.imread(...)), I got this error.It turned out that when saving artificiallycreatedimages you need to add dtype=np.uint8. That resolved the issue for me!
我使用人工创建的图像，即我自己创建它们，然后在它们上训练神经网络以执行特定任务。所以，我创建了这些图像，保存了它们，但是当我尝试打开它们时（使用 cv2.imread(...)），我得到了这个错误。原来，在保存人工创建的图像时，你需要添加dtype=np .uint8。这为我解决了问题！
回答by Md. Shofiulla
I also face the same issue "OpenCV NoneType object has no attribute shape" and i solve this by changing the image location. I also use the PyCharm IDE. Currently my image location and class file in the same folder. 
我也面临同样的问题“OpenCV NoneType 对象没有属性形状”，我通过更改图像位置来解决这个问题。我也使用 PyCharm IDE。目前我的图像位置和类文件在同一个文件夹中。
回答by jdhao
I have also met this issue and wasted a lot of time debugging it.
我也遇到过这个问题，浪费了很多时间调试。
First, make sure that the path you provide is valid, i.e., there is an image in that path.
首先，确保您提供的路径有效，即该路径中有图像。
Next, you should be aware that Opencv doesn't support image paths which contain unicode characters(see ref). If your image path contains Unicode characters, you can use the following code to read the image:
接下来，您应该知道Opencv 不支持包含 unicode 字符的图像路径（请参阅ref）。如果您的图片路径包含 Unicode 字符，您可以使用以下代码读取图片：
import numpy as np
import cv2
# img is in BGR format if the underlying image is a color image
img = cv2.imdecode(np.fromfile(im_path, dtype=np.uint8), cv2.IMREAD_UNCHANGED)
