Mat src = imread("D:/opencv练习图片/去阴影.png");
imshow("原图", src);
//1.将图像转为灰度图
Mat gray;
cvtColor(src, gray, COLOR_BGR2GRAY);

//定义腐蚀和膨胀的结构化元素和迭代次数
Mat element = getStructuringElement(MORPH_RECT, Size(3, 3));
int iteration = 9;
//2.将灰度图进行闭运算操作
Mat closeMat;
morphologyEx(gray, closeMat, MORPH_CLOSE, element, Point(-1, -1), iteration);
imshow("闭运算", closeMat);

//4.闭运算后的图减去原灰度图再进行取反操作
Mat calcMat = ~(closeMat - gray);
imshow("calc", calcMat);

//5.使用规一化将原来背景白色的改了和原来灰度图差不多的灰色
Mat removeShadowMat;
normalize(calcMat, removeShadowMat, 0, 200, NORM_MINMAX);
imshow("dst", removeShadowMat);