python-3.x - TypeError : Layout of the output array img is incompatible with cv::Mat (step[ndims-1] != elemsize or step[1] != elemsize*nchannels)

Question

我收到此代码错误:

import matplotlib.pyplot as plt
import cv2
import numpy as np

black = np.zeros(shape = (512, 512, 3), dtype = np.int64)
cv2.circle(black, center = (100, 100), radius = 50, color = (0, 255, 0), thickness = 10)

plt.imshow(black)

结果，应该在黑色图像上打印一个绿色圆圈。但是我越来越

TypeError: Layout of the output array img is incompatible with

cv::Mat (step[ndims-1] != elemsize or step[1] != elemsize*nchannels)

Answer 1

创建dtype = np.int64 numpy矩阵时使用black似乎是个问题。使用RGB图像时，通常不需要64位整数值，可以安全地将8位char值用作:

black = np.zeros(shape = (512, 512, 3), dtype = np.uint8)

但是，OpenCV在给定的矩阵中支持32位整数值，但是对于创建RGB图像来说似乎是过大的，因为所有RGB域颜色仅需要8位即可表示像素颜色分量(0-255)。