Python-OpenCV程序报错

风吹雪垅

#程序
import cv2
import numpy as np
from matplotlib import pyplot as plt

img = cv2.imread('D:/download/PyCharm/PycharmProjects/5.1.jpg')
img = cv2.medianBlur(img,5)

ret,th1 = cv2.threshold(img,127,255,cv2.THRESH_BINARY)
th2 = cv2.adaptiveThreshold(img,255,
      cv2.ADAPTIVE_THRESH_MEAN_C,
      cv2.THRESH_BINARY,11,2)
th3 = cv2.adaptiveThreshold(img,255,cv2.ADAPTIVE_THRESH_GAUSSIAN_C,cv2.THRESH_BINARY,11,2)

titles = ['original image' , 'global thresholding ','Adaptive mean thresholding',
          'adaptive gaussian thresholding']
images = [img,th1,th2,th3]

for i in range(4):
    plt.subplot(2, 2, i+1),plt.imshow(images,'gray')
    plt.title(titles)
    plt.xticks([]),plt.yticks([])
plt.show()
报错提示：Traceback (most recent call last):  File "D:/download/PyCharm/PycharmProjects/1049.py", line 11, in <module>    cv2.THRESH_BINARY,11,2)cv2.error: OpenCV(3.4.3) C:\projects\opencv-python\opencv\modules\imgproc\src\thresh.cpp:1524: error: (-215:Assertion failed) src.type() == CV_8UC1 in function 'cv::adaptiveThreshold'不得其解，求助大佬！

jsxyheu2014

请重新整理你提交的代码

stq054188

第一，已经提示你11行报错
第二，进一步报错信息二值化需要单通道，你的输入是彩色图，要做灰度转换