Sobel

https://blog.csdn.net/qq_37124237/article/details/82183177

void cv::Sobel( InputArray _src, OutputArray _dst, int ddepth, int dx, int dy, int ksize, double scale, double delta, int borderType )

src	输入图像
dst	输出图像 the same size and the same number of channels as src .
ddepth	输出图像深度，输入图像为CV_8U，sobel的结果一般为CV_16S
dx	order of the derivative x.：x导数的阶数？？？（只能0、1、2）
dy	order of the derivative y.：y导数的阶数？？？
ksize	size of the extended Sobel kernel; it must be 1, 3, 5, or 7. ：差分算子的核大小
scale	optional scale factor for the computed derivative values; by default, no scaling is applied ：导数结果的比例系数
delta	optional delta value that is added to the results prior to storing them in dst.：偏移值
borderType	pixel extrapolation method, see cv::BorderTypes

说明：

1、Sobel方法：离散性差分算子