python+opencv运行报错 Invalid number of channels in input image:
想把剩下的图像处理小demo跑一趟，在做Canny边缘提取处理时报错
程序如下：
import cv2 as cv
import numpy as np
def edge_demo(image):
blurred = cv.GaussianBlur(image, (3, 3), 0)
gray = cv.cvtColor(blurred, cv.COLOR_GRAY2BGR)
# X Grodient
xgrad = cv.Sobel(gray, cv.CV_16SC1, 1, 0)
# Y grodient
ygrad = cv.Sobel(gray, cv.CV_16SC1, 0, 1)
#edge
edge_output = cv.Canny(xgrad, ygrad, 50, 150)
cv.imshow("Canny Edge", edge_output)
dst = cv.bitwise_and(image, image, mask=edge_output)
cv.imshow("Color Edge", dst)
print("------------come on baby-------------")
src = cv.imread("D:/sbilibili/lena.jpg")
cv.namedWindow("input image", cv.WINDOW_AUTOSIZE)
cv.imshow("input image", src)
edge_demo(src)
cv.waitKey(0)
cv.destroyAllWindows()
错误信息如下：
Traceback (most recent call last):
File "E:/untitled1/tutorial_17.py", line 22, in
edge_demo(src)
File "E:/untitled1/tutorial_17.py", line 6, in edge_demo
gray = cv.cvtColor(blurred, cv.COLOR_GRAY2BGR)
cv2.error: OpenCV(4.1.0) c:\projects\opencv-python\opencv\modules\imgproc\src\color.simd_helpers.hpp:92: error: (-2:Unspecified error) in function '__cdecl cv::impl::`anonymous-namespace'::CvtHelper,struct cv::impl::A0xe227985e::Set<3,4,-1>,struct cv::impl::A0xe227985e::Set<0,2,5>,2>::CvtHelper(const class cv::_InputArray &,const class cv::_OutputArray &,int)'
> Invalid number of channels in input image:
> 'VScn::contains(scn)'
> where
> 'scn' is 3
各种谷歌之后问题大概是我的opencv-contrib-python和opencv-python版本太高，把两个库重新加载，选择3.4.2.16
之后运行报错
Traceback (most recent call last): File "E:/untitled1/tutorial_17.py", line 23, in
又是一圈谷歌。。没啥用，结果仔细看一下代码，发现line7 cv.COLOR_BGR2GRAY写成了cv.COLOR_GRAY2BGR
行吧。。能出来就行
