'SystemError: new style getargs format but argument is not a tuple?

What causes the SystemError in this line of code cv2.line(output, point1, point2, (0,0,255), 5)?

python opencv

Solution 1:^[1]

Faced with the same problem and solved it by using tuples instead of lists:

# How it looked before:
point1, point2 = [x1, y1], [x2, y2]

# How it should be:
point1, point2 = (x1, y1), (x2, y2)

Solution 2:^[2]

Python OpenCV drawing functions take points as tuples. Possibly your point1 and point2 are of some other type, eg. a list maybe. So try this

cv2.line(output, tuple(point1), tuple(point2), (0,0,255),5)

The error is raised, because the OpenCV Python extensions call the function PyArg_ParseTuple() with something that is not a tuple. [see here]

Solution 3:^[3]

It seems the lastest version opencv-python have fixed this issue, I upgrade opencv-python from 4.4.0.44 to 4.5.5.64 by pip install --upgrade opencv-python, then this error disappear.

Solution 4:^[4]

Try this...

point1=(x1,x2)
point2=(y1,y2)
new_img=cv2.line(img,point1,point2,(0,0,255),3)

Solution 5:^[5]

The passing arguments aren't matching with the desirable arguments. I have faced same problem for:

x = cv2.resize(img, (32*32)).flatten()
x.resize(3032, 1)

And, solve it by correcting 32*32 to 32, 32.

x = cv2.resize(img, (32,32)).flatten()
x.resize(3032, 1)

Solution 6:^[6]

just write this following way v2.line(output, tuple(point1), tuple(point2), (0,0,255), 5)?

Solution 7:^[7]

since it didn't work in colab :(with same error )

cv2.drawChessboardCorners(imgBoard, board_size, found_corners, True) plt.imshow("imgBoard", imgBoard)

*i switched to my own small function:*
def showImageWithCorners(img,cornerToShow):
  plt.plot(cornerToShow[:,0], cornerToShow[:,1], marker='o', color="red")
  plt.imshow(img)

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Leonid Dashko
Solution 2
Solution 3	Wade Wang
Solution 4	praveen kumar dakua
Solution 5	Shuvra
Solution 6	Ishaque3 Nizamani
Solution 7	user3452134

'SystemError: new style getargs format but argument is not a tuple?

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