opencv(5) 图片加减乘除操作

	Mat dst = Mat::zeros(image.size(), image.type());
	Mat m = Mat::zeros(image.size(), image.type());

	m = Scalar(5, 5, 5);

	int w = image.cols;
	int h = image.rows;
	int dims = image.channels();
	for (int row = 0; row < h; row++) {
		for (int col = 0; col < w; col++) {
			Vec3b p1 = image.at<Vec3b>(row, col);
			Vec3b p2 = m.at<Vec3b>(row, col);
			dst.at<Vec3b>(row, col)[0] = saturate_cast<uchar>(p1[0] + p2[0]);
			dst.at<Vec3b>(row, col)[1] = saturate_cast<uchar>(p1[1] + p2[1]);
			dst.at<Vec3b>(row, col)[2] = saturate_cast<uchar>(p1[2] + p2[2]);
		}
	}

saturate_cast<>()

限定类型取值范围，如uchar型，对其操作取值会限定在0～255之间，超过则取上下界，防止越界。

    add(image,m,dst1);
    subtract(image,m,dst);
    multiply(image,m,dst2);
	divide(image, m, dst3);

图片加减乘除操作