Python OpenCV-绘制直线或矩形时出错

我在尝试运行以下代码时出错，不知道原因。这与教程中使用的代码基本相同

错误：

Traceback (most recent call last):
  File "cv_trackbar2.py", line 41, in <module>
    cv2.imshow('frame',img)
cv2.error: /build/buildd/opencv-2.4.5+dfsg/modules/core/src/array.cpp:2482: error: (-206)     Unrecognized or unsupported array type in function cvGetMat

从中可以看出函数

cv2.rectangle

返回

void

。因此，问题是您正在将返回值（即

None

）分配给

img

改为这样做

# Create a black image
img = np.zeros((512,512,3), np.uint8)

# Draw a green rectangle
cv2.rectangle(img,(384,0),(510,128),(0,255,0),3)

while (True):

    cv2.imshow('draw',img)
    k = cv2.waitKey(1) & 0xFF
    if k == 27:
        break
cv2.destroyAllWindows()

---

非常感谢。我只是跟着教程走，所以我想他们的东西是正确的。

# Create a black image
img = np.zeros((512,512,3), np.uint8)

# Draw a green rectangle
cv2.rectangle(img,(384,0),(510,128),(0,255,0),3)

while (True):

    cv2.imshow('draw',img)
    k = cv2.waitKey(1) & 0xFF
    if k == 27:
        break
cv2.destroyAllWindows()