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效果图

代码

string boundRect(string srcPath)
{
	Mat srcImage = imread(srcPath);
	if (srcImage.empty())
	{
		return "srcImage is Empty";
	}
	else
	{
		Mat temp;
		Mat binary_temp;
		cvtColor(srcImage, temp, COLOR_BGR2GRAY);
		threshold(temp, binary_temp, 150, 255, CV_THRESH_BINARY_INV);
		//imshow("temp", binary_temp);
		vector<vector<Point>> contours;
		vector<Vec4i> hierarchy;
		findContours(binary_temp, contours, hierarchy, RETR_EXTERNAL, CHAIN_APPROX_SIMPLE, Point(0, 0));
		vector<Rect> boundRect(contours.size());
		for (int i = 0; i < contours.size(); i++)
		{
			boundRect[i] = boundingRect(Mat(contours[i]));
			rectangle(srcImage, boundRect[i].tl(), boundRect[i].br(), (0, 0, 255), 2, 8, 0);
			//rectangle(srcImage, boundRect[i].tl(), boundRect[i].br(), (255, 0, 0), 2, 8, 0);
			//rectangle(srcImage,rect,(255, 0, 0), 2, 8, 0);
		}
		imshow("srcImage", srcImage);
		waitKey(0);
		return "success";
	}
}

string minRect(string srcPath)
{
	Mat srcImage = imread(srcPath);
	if (srcImage.empty())
	{
		return "srcImage is Empty";
	}
	else
	{
		Mat grayImage, binaryImage;
		cvtColor(srcImage, grayImage, CV_BGR2GRAY);
		threshold(grayImage, binaryImage, 100, 255, CV_THRESH_BINARY_INV);//自适应二值化

		vector<vector<Point>> contours;
		vector<Vec4i> hierarchy;
		findContours(binaryImage, contours, hierarchy, RETR_EXTERNAL, CHAIN_APPROX_NONE, Point());

		Mat drawingPicture = Mat::zeros(binaryImage.size(), CV_8UC1); //最小外接矩形画布  
		for (int i = 0; i < contours.size(); i++)
		{
			//绘制轮廓  
			drawContours(drawingPicture, contours, i, Scalar(255), 1, 8, hierarchy);

			//绘制轮廓的最小外结矩形  
			RotatedRect rect = minAreaRect(contours[i]);
			//rectangle(画布,rect.boundingRect(),Scalar(55));
			Point2f P[4];

			rect.points(P);
			for (int j = 0; j <= 3; j++)
			{
				line(srcImage, P[j], P[(j + 1) % 4], Scalar(0, 0, 255), 1);
				line(drawingPicture, P[j], P[(j + 1) % 4], Scalar(111), 2);
			}

		}
		imshow("标注出矩形", srcImage);
		waitKey(0);
		return "success";
	}
}