Python错误集锦：OpenCV calcHist计算直方图提示Can’t convert object to vector for ‘histSize’, unsupported type

原文链接：http://www.juzicode.com/python-error-convert-object-to-vector-for-histsize-unsupported-type

错误提示：

OpenCV calcHist计算直方图提示Can’t convert object to vector for ‘histSize’, unsupported type

#VX公众号: 桔子code / juzicode.com
import matplotlib.pyplot as plt
import numpy as np
import cv2  
print('cv2.__version__:',cv2.__version__)

img_src = cv2.imread('lena.jpg') 
histSize = 256
histRange = (0, histSize)  
b_hist = cv2.calcHist([img_src], [0], None, histSize, histRange,accumulate=True) 
plt.title('b hist')
plt.plot(b_hist) 
plt.show() 

==========运行结果：
cv2.__version__: 4.5.3
---------------------------------------------------------------------------
error                                     Traceback (most recent call last)
<ipython-input-8-777008a0af16> in <module>
      8 histSize = 256
      9 histRange = (0, histSize)
---> 10 b_hist = cv2.calcHist([img_src], [0], None, histSize, histRange,accumulate=True)
     11 plt.title('b hist')
     12 plt.plot(b_hist)

error: OpenCV(4.5.3) :-1: error: (-5:Bad argument) in function 'calcHist'
> Overload resolution failed:
>  - Can't convert object to vector for 'histSize', unsupported type
>  - Can't convert object to vector for 'histSize', unsupported type

错误原因：

1、calcHist的histSize入参要求为tuple或list类型，这里输入的为整数类型，图示类型转换错误。

解决方法：

1、将histSize改为list或tuple类型输入，比如用[histSize]传入：

#VX公众号: 桔子code / juzicode.com
import matplotlib.pyplot as plt
import numpy as np
import cv2  
print('cv2.__version__:',cv2.__version__)

img_src = cv2.imread('lena.jpg') 
histSize = 256
histRange = (0, histSize)  
b_hist = cv2.calcHist([img_src], [0], None, [histSize], histRange,accumulate=True)  
plt.title('b hist')
plt.plot(b_hist) 
plt.show() 

扩展内容：

1. OpenCV-Python教程

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