Python错误集锦：OpenCV Laplacian()提示deriv.cpp:104: error: (-211:One of the arguments’ values is out of range) The kernel size must be odd and not larger than 31 in function ‘cv::getSobelKernels’

原文链接：http://www.juzicode.com/opencv-error-laplacian-kernel-size-must-be-odd-not-larger-than-31

错误提示：

OpenCV Laplacian()提示deriv.cpp:104: error: (-211:One of the arguments’ values is out of range) The kernel size must be odd and not larger than 31 in function ‘cv::getSobelKernels’

#VX公众号:桔子code / juzicode.com
import cv2
print('cv2.__version__:',cv2.__version__)
img = cv2.imread('lena.jpg')
img_gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
img_edge = cv2.Laplacian(img_gray,cv2.CV_8U,ksize=4)
cv2.imshow('img_edge',img_edge)
cv2.waitKey(0)
cv2.destroyAllWindows()

==========运行结果：
cv2.__version__: 4.5.2
---------------------------------------------------------------------------
error                                     Traceback (most recent call last)
<ipython-input-4-16cba4f12541> in <module>
      4 img = cv2.imread('lena.jpg')
      5 img_gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
----> 6 img_edge = cv2.Laplacian(img_gray,cv2.CV_8U,ksize=4)
      7 cv2.imshow('img_edge',img_edge)
      8 cv2.waitKey(0)

error: OpenCV(4.5.2) C:\Users\runneradmin\AppData\Local\Temp\pip-req-build-kuwfz3h3\opencv\modules\imgproc\src\deriv.cpp:104: error: (-211:One of the arguments' values is out of range) The kernel size must be odd and not larger than 31 in function 'cv::getSobelKernels'

错误原因：

1、Laplacian()、Sobel()等计算图像边缘时ksize必须为奇数，且不能大于31

解决方法：

1、ksize设置为奇数，比如5：

#VX公众号:桔子code / juzicode.com
import cv2
print('cv2.__version__:',cv2.__version__)
img = cv2.imread('lena.jpg')
img_gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
img_edge = cv2.Laplacian(img_gray,cv2.CV_8U,ksize=5) #ksize设置为奇数
cv2.imshow('img_edge',img_edge)
cv2.waitKey(0)
cv2.destroyAllWindows()

扩展内容：

1. OpenCV-Python教程

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