使用 Scalar 函数进行加减乘除

dst = image + Scalar(50, 50, 50);
	imshow("加法运算",dst);

	dst = image - Scalar(50, 50, 50);
	imshow("加法运算",dst);

	dst = image / Scalar(2, 2, 2);
	imshow("除法法运算", dst);

	Mat m = Mat::zeros(image.size(),image.type());
	m = Scalar(2,2,2);
	multiply(image,m,dst);
	imshow("乘法运算", dst);

底层代码分解

int w = image.cols;
	int h = image.rows;
	int dims = image.channels();

	m = Scalar(50,50,50);

	for (int row = 0; row < h; row++)
	{
		for (int cols = 0; cols < w; cols++)
		{
				Vec3b p1 = image.at<Vec3b>(row, cols);
				Vec3b p2 = image.at<Vec3b>(row, cols);

				image.at<Vec3b>(row, cols)[0] = saturate_cast<uchar>(p1[0]+p2[0]);
				image.at<Vec3b>(row, cols)[1] = saturate_cast<uchar>(p1[1] + p2[1]);
				image.at<Vec3b>(row, cols)[2] = saturate_cast<uchar>(p1[2] + p2[2]);
				
		}
	}

使用OpenCV 自带函数 

//add(image,m,dst);
	//subtract(image, m, dst);
	//multiply(image, m, dst);cpp