【VC++、OpenCV3.4】膨胀和腐蚀以及形态学操作

相关API：

1、构造结构元：

/*
@param shape Element shape that could be one of #MorphShapes
@param ksize Size of the structuring element.
@param anchor Anchor position within the element. The default value \f$(-1, -1)\f$ means that the
anchor is at the center. Note that only the shape of a cross-shaped element depends on the anchor
position. In other cases the anchor just regulates how much the result of the morphological
operation is shifted.
 */
CV_EXPORTS_W Mat getStructuringElement(int shape, Size ksize, Point anchor = Point(-1,-1));

shape：（MORPH_RECT\MORPH_CROSS\MORPH_ELLIPSE）

锚点默认Point(-1,-1)——中心像素

膨胀：dilate（src,dst,kernel），腐蚀：erode（src，dst，kernel）

2、动态调整结构元大小TrackBar——createTrackbar()

注意其中回调函数的使用方法。

/*
@param trackbarname Name of the created trackbar.
@param winname Name of the window that will be used as a parent of the created trackbar.
@param value Optional pointer to an integer variable whose value reflects the position of the
slider. Upon creation, the slider position is defined by this variable.
@param count Maximal position of the slider. The minimal position is always 0.
@param onChange Pointer to the function to be called every time the slider changes position. This
function should be prototyped as void Foo(int,void\*); , where the first parameter is the trackbar
position and the second parameter is the user data (see the next parameter). If the callback is
the NULL pointer, no callbacks are called, but only value is updated.
@param userdata User data that is passed as is to the c