Created a Plot module that allows you to easily plot data from a Mat.

modules/plot/CMakeLists.txt

+set(the_description "Plot function for Mat/std::vector data.")
+ocv_define_module(plot opencv_core opencv_highgui)

modules/plot/README.md

+Plot Module Overview
+====================
+
+Created by Nuno Moutinho
+
+This Plot module allows you to easily plot data in 1D or 2D. You can change the size of the window, the limits of the axis and the colors of each element. You can also show in real time the plot you are building or save the plot as an image (png).

modules/plot/doc/plot.markdown

+Plot Module Overview
+====================
+
+This Plot module allows you to easily plot data in 1D or 2D. You can change the size of the window, the limits of the axis and the colors of each element. You can also show in real time the plot you are building or save the plot as an image (png).

modules/plot/include/opencv2/plot/plot.hpp

+/*M///////////////////////////////////////////////////////////////////////////////////////
+//
+//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
+//  By downloading, copying, installing or using the software you agree to this license.
+//  If you do not agree to this license, do not download, install,
+//  copy or use the software.
+//
+//
+//                          License Agreement
+//                For Open Source Computer Vision Library
+//
+// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
+// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
+// Copyright (C) 2013, OpenCV Foundation, all rights reserved.
+// Third party copyrights are property of their respective owners.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+//   * Redistribution's of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//
+//   * Redistribution's in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//
+//   * The name of the copyright holders may not be used to endorse or promote products
+//     derived from this software without specific prior written permission.
+//
+// This software is provided by the copyright holders and contributors "as is" and
+// any express or implied warranties, including, but not limited to, the implied
+// warranties of merchantability and fitness for a particular purpose are disclaimed.
+// In no event shall the Intel Corporation or contributors be liable for any direct,
+// indirect, incidental, special, exemplary, or consequential damages
+// (including, but not limited to, procurement of substitute goods or services;
+// loss of use, data, or profits; or business interruption) however caused
+// and on any theory of liability, whether in contract, strict liability,
+// or tort (including negligence or otherwise) arising in any way out of
+// the use of this software, even if advised of the possibility of such damage.
+//
+//M*/
+//################################################################################
+//
+//                    Created by Nuno Moutinho
+//
+//################################################################################
+
+#ifdef __OPENCV_BUILD
+#error this is a compatibility header which should not be used inside the OpenCV library
+#endif
+
+#include "opencv2/plot.hpp"

modules/plot/src/plot.cpp

+/*M///////////////////////////////////////////////////////////////////////////////////////
+//
+//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
+//  By downloading, copying, installing or using the software you agree to this license.
+//  If you do not agree to this license, do not download, install,
+//  copy or use the software.
+//
+//
+//                           License Agreement
+//                For Open Source Computer Vision Library
+//
+// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
+// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
+// Third party copyrights are property of their respective owners.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+//   * Redistribution's of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//
+//   * Redistribution's in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//
+//   * The name of the copyright holders may not be used to endorse or promote products
+//     derived from this software without specific prior written permission.
+//
+// This software is provided by the copyright holders and contributors "as is" and
+// any express or implied warranties, including, but not limited to, the implied
+// warranties of merchantability and fitness for a particular purpose are disclaimed.
+// In no event shall the Intel Corporation or contributors be liable for any direct,
+// indirect, incidental, special, exemplary, or consequential damages
+// (including, but not limited to, procurement of substitute goods or services;
+// loss of use, data, or profits; or business interruption) however caused
+// and on any theory of liability, whether in contract, strict liability,
+// or tort (including negligence or otherwise) arising in any way out of
+// the use of this software, even if advised of the possibility of such damage.
+//
+//M*/
+//################################################################################
+//
+//                    Created by Nuno Moutinho
+//
+//################################################################################
+
+#include "precomp.hpp"
+
+using namespace cv;
+using namespace std;
+
+///render the plotResult to a Mat
+void Plot::render(cv::Mat &_plotResult){
+
+    ///create the plot result
+    plotResult = cv::Mat::zeros(plotSizeHeight, plotSizeWidth, CV_8UC3);
+
+    int NumVecElements = plotDataX.rows;
+
+    Mat InterpXdata = linearInterpolation(plotMinX, plotMaxX, 0, plotSizeWidth, plotDataX);
+    Mat InterpYdata = linearInterpolation(plotMinY, plotMaxY, 0, plotSizeHeight, plotDataY);
+
+    ///Find the zeros in image coordinates
+    Mat InterpXdataFindZero = linearInterpolation(plotMinX_plusZero, plotMaxX_plusZero, 0, plotSizeWidth, plotDataX_plusZero);
+    Mat InterpYdataFindZero = linearInterpolation(plotMinY_plusZero, plotMaxY_plusZero, 0, plotSizeHeight, plotDataY_plusZero);
+
+    int ImageXzero = (int)InterpXdataFindZero.at<double>(NumVecElements,0);
+    int ImageYzero = (int)InterpYdataFindZero.at<double>(NumVecElements,0);
+
+    double CurrentX = plotDataX.at<double>(NumVecElements-1,0);
+    double CurrentY = plotDataY.at<double>(NumVecElements-1,0);
+
+    //Draw the plot by connecting lines between the points
+    cv::Point p1;
+    p1.x = (int)InterpXdata.at<double>(0,0);
+    p1.y = (int)InterpYdata.at<double>(0,0);
+
+    drawAxis(ImageXzero,ImageYzero, CurrentX, CurrentY, plotAxisColor, plotGridColor);
+
+    for (int r=1; r<InterpXdata.rows; r++){
+
+        cv::Point p2;
+        p2.x = (int)InterpXdata.at<double>(r,0);
+        p2.y = (int)InterpYdata.at<double>(r,0);
+
+        line(plotResult, p1, p2, plotLineColor, plotLineWidth, 8, 0);
+
+        p1 = p2;
+
+    }
+
+    _plotResult = plotResult.clone();
+
+}
+
+///show the plotResult from within the class
+void Plot::show(const char * _plotName)
+{
+    namedWindow(_plotName);
+    imshow(_plotName, plotResult);
+    waitKey(5);
+}
+
+///save the plotResult as a .png image
+void Plot::save(const char * _plotFileName)
+{
+    imwrite(_plotFileName, plotResult);
+}
+
+void Plot::drawAxis(int ImageXzero, int ImageYzero, double CurrentX, double CurrentY, Scalar axisColor, Scalar gridColor){
+
+    drawValuesAsText(0, ImageXzero, ImageYzero, 10, 20);
+    drawValuesAsText(0, ImageXzero, ImageYzero, -20, 20);
+    drawValuesAsText(0, ImageXzero, ImageYzero, 10, -10);
+    drawValuesAsText(0, ImageXzero, ImageYzero, -20, -10);
+    drawValuesAsText("X = %g",CurrentX, 0, 0, 40, 20);
+    drawValuesAsText("Y = %g",CurrentY, 0, 20, 40, 20);
+
+    //Horizontal X axis and equispaced horizontal lines
+    int LineSpace = 50;
+    int TraceSize = 5;
+    drawLine(0, plotSizeWidth, ImageYzero, ImageYzero, axisColor);
+
+    for(int i=-plotSizeHeight; i<plotSizeHeight; i=i+LineSpace){
+
+        if(i!=0){
+            int Trace=0;
+            while(Trace<plotSizeWidth){
+                drawLine(Trace, Trace+TraceSize, ImageYzero+i, ImageYzero+i, gridColor);
+                Trace = Trace+2*TraceSize;
+            }
+        }
+    }
+
+
+    //Vertical Y axis
+    drawLine(ImageXzero, ImageXzero, 0, plotSizeHeight, axisColor);
+
+    for(int i=-plotSizeWidth; i<plotSizeWidth; i=i+LineSpace){
+
+        if(i!=0){
+            int Trace=0;
+            while(Trace<plotSizeHeight){
+                drawLine(ImageXzero+i, ImageXzero+i, Trace, Trace+TraceSize, gridColor);
+                Trace = Trace+2*TraceSize;
+            }
+        }
+    }
+}
+
+Mat Plot::linearInterpolation(double Xa, double Xb, double Ya, double Yb, cv::Mat Xdata){
+
+    Mat Ydata = Xdata*0;
+
+    for (int i=0; i<Xdata.rows; i++){
+
+        double X = Xdata.at<double>(i,0);
+        Ydata.at<double>(i,0) = int(Ya + (Yb-Ya)*(X-Xa)/(Xb-Xa));
+
+        if(Ydata.at<double>(i,0)<0)
+            Ydata.at<double>(i,0)=0;
+
+    }
+
+    return Ydata;
+
+}
+
+void Plot::drawValuesAsText(double Value, int Xloc, int Yloc, int XMargin, int YMargin){
+
+    char AxisX_Min_Text[20];
+    double TextSize = 1;
+
+    sprintf(AxisX_Min_Text, "%g", Value);
+    cv::Point AxisX_Min_Loc;
+    AxisX_Min_Loc.x = Xloc+XMargin;
+    AxisX_Min_Loc.y = Yloc+YMargin;
+
+    putText(plotResult,AxisX_Min_Text, AxisX_Min_Loc, FONT_HERSHEY_COMPLEX_SMALL, TextSize, plotTextColor, 1, 8);
+}
+
+void Plot::drawValuesAsText(const char *Text, double Value, int Xloc, int Yloc, int XMargin, int YMargin){
+
+    char AxisX_Min_Text[20];
+    int TextSize = 1;
+
+    sprintf(AxisX_Min_Text, Text, Value);
+    cv::Point AxisX_Min_Loc;
+    AxisX_Min_Loc.x = Xloc+XMargin;
+    AxisX_Min_Loc.y = Yloc+YMargin;
+
+    putText(plotResult,AxisX_Min_Text, AxisX_Min_Loc, FONT_HERSHEY_COMPLEX_SMALL, TextSize, plotTextColor, 1, 8);
+
+}
+
+
+void Plot::drawLine(int Xstart, int Xend, int Ystart, int Yend, Scalar lineColor){
+
+    cv::Point Axis_start;
+    cv::Point Axis_end;
+    Axis_start.x = Xstart;
+    Axis_start.y = Ystart;
+    Axis_end.x = Xend;
+    Axis_end.y = Yend;
+
+    line(plotResult, Axis_start, Axis_end, lineColor, plotLineWidth, 8, 0);
+
+}

modules/plot/src/precomp.cpp

+/*M///////////////////////////////////////////////////////////////////////////////////////
+//
+//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
+//  By downloading, copying, installing or using the software you agree to this license.
+//  If you do not agree to this license, do not download, install,
+//  copy or use the software.
+//
+//
+//                          License Agreement
+//                For Open Source Computer Vision Library
+//
+// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
+// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
+// Third party copyrights are property of their respective owners.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+//   * Redistribution's of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//
+//   * Redistribution's in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//
+//   * The name of the copyright holders may not be used to endorse or promote products
+//     derived from this software without specific prior written permission.
+//
+// This software is provided by the copyright holders and contributors "as is" and
+// any express or implied warranties, including, but not limited to, the implied
+// warranties of merchantability and fitness for a particular purpose are disclaimed.
+// In no event shall the Intel Corporation or contributors be liable for any direct,
+// indirect, incidental, special, exemplary, or consequential damages
+// (including, but not limited to, procurement of substitute goods or services;
+// loss of use, data, or profits; or business interruption) however caused
+// and on any theory of liability, whether in contract, strict liability,
+// or tort (including negligence or otherwise) arising in any way out of
+// the use of this software, even if advised of the possibility of such damage.
+//
+//M*/
+//################################################################################
+//
+//                    Created by Nuno Moutinho
+//
+//################################################################################
+
+#include "precomp.hpp"
+
+/* End of file. */

modules/plot/src/precomp.hpp

+/*M///////////////////////////////////////////////////////////////////////////////////////
+//
+//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
+//  By downloading, copying, installing or using the software you agree to this license.
+//  If you do not agree to this license, do not download, install,
+//  copy or use the software.
+//
+//
+//                          License Agreement
+//                For Open Source Computer Vision Library
+//
+// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
+// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
+// Third party copyrights are property of their respective owners.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+//   * Redistribution's of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//
+//   * Redistribution's in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//
+//   * The name of the copyright holders may not be used to endorse or promote products
+//     derived from this software without specific prior written permission.
+//
+// This software is provided by the copyright holders and contributors "as is" and
+// any express or implied warranties, including, but not limited to, the implied
+// warranties of merchantability and fitness for a particular purpose are disclaimed.
+// In no event shall the Intel Corporation or contributors be liable for any direct,
+// indirect, incidental, special, exemplary, or consequential damages
+// (including, but not limited to, procurement of substitute goods or services;
+// loss of use, data, or profits; or business interruption) however caused
+// and on any theory of liability, whether in contract, strict liability,
+// or tort (including negligence or otherwise) arising in any way out of
+// the use of this software, even if advised of the possibility of such damage.
+//
+//M*/
+//################################################################################
+//
+//                    Created by Nuno Moutinho
+//
+//################################################################################
+
+#ifndef __OPENCV_PRECOMP_H__
+#define __OPENCV_PRECOMP_H__
+
+#include <opencv2/core.hpp>
+#include <opencv2/highgui.hpp>
+#include <opencv2/imgproc.hpp>
+
+#include <vector>
+#include <iostream>
+#include <stdio.h>
+
+#include "opencv2/plot.hpp"
+#include "opencv2/opencv_modules.hpp"
+
+#endif