类型错误：不支持 mat 数据类型 = 0

Question

我想用cv2.imshow("Otsu img", binary)而不是plt.imshow( binary)

我收到错误

完整代码：

import matplotlib.pyplot as plt
from skimage import io
from skimage.filters.rank import entropy
from skimage.morphology import disk
import numpy as np
from skimage.filters import threshold_otsu
import cv2

img = io.imread("scratch.jpg")
entropy_img = entropy(img, disk(10))
thresh = threshold_otsu(entropy_img)

binary = entropy_img <= thresh



cv2.imshow("Otsu img", binary)

cv2.waitKey(0)
cv2.destroyAllWindows()

如何修复这个错误？

 cv2.imshow("Otsu img", binary)
TypeError: mat data type = 0 is not supported

Answer 1

可以通过将二进制转换为dtype=uint8使用来纠正类型错误，

binary = np.asarray(binary, dtype="uint8")

或使用以下命令更改二进制文件的类型astype(np.uint8)

但经过原始海报@Redhwan之间的进一步讨论，OP 发现了问题，并且以下脚本似乎解决了问题：

import matplotlib.pyplot as plt
from skimage import io
from skimage.filters.rank import entropy
from skimage.morphology import disk
import numpy as np
from skimage.filters import threshold_otsu
import cv2

img = cv2.imread("scratch.jpg", 0)
entropy_img = entropy(img, disk(10))
# print type(entropy_img), entropy_img
thresh = threshold_otsu(entropy_img)
# print thresh
# binary = entropy_img <= thresh
ret1, th1 = cv2.threshold(entropy_img, thresh, 255, cv2.THRESH_BINARY_INV)
# print type(entropy)


cv2.imshow("Otsu img", img)
cv2.imshow("Otsu th2", th1)
# cv2.imshow("OTSU Gaussian cleaned", th3)
# cv2.imshow("OTSU median cleaned", th4)
cv2.waitKey(0)
cv2.destroyAllWindows()