Add sample

samples/cpp/falsecolor.cpp

+#include <opencv2/opencv.hpp>
+
+using namespace cv;
+using namespace std;
+
+enum {MyCIRCLE=0,MyRECTANGLE,MyELLIPSE}MyShape;
+
+struct ParamColorMar {
+    int iColormap;
+    Mat img;
+};
+
+Ptr<Mat> lutRND;
+String winName="False color";
+
+static void TrackColorMap(int x, void *r)
+{
+    ParamColorMar *p = (ParamColorMar*)r;
+    Mat dst;
+    p->iColormap= x;
+    if (x == cv::COLORMAP_PARULA + 1)
+    {
+        if (!lutRND)
+        {
+            RNG r;
+            Mat *palette = new Mat(256, 1, CV_8UC3);
+            r.fill(*palette, RNG::UNIFORM, 0, 256);
+            lutRND = Ptr<Mat>(palette);
+        }
+        applyColorMap(p->img, dst, *lutRND.get());
+    }
+    else
+        applyColorMap(p->img,dst,p->iColormap);
+    String colorMapName;
+
+    switch (p->iColormap) {
+    case COLORMAP_AUTUMN :
+        colorMapName = "Colormap : Autumn";
+        break;
+    case COLORMAP_BONE :
+        colorMapName = "Colormap : Bone";
+        break;
+    case COLORMAP_JET :
+        colorMapName = "Colormap : Jet";
+        break;
+    case COLORMAP_WINTER :
+        colorMapName = "Colormap : Winter";
+        break;
+    case COLORMAP_RAINBOW :
+        colorMapName = "Colormap : Rainbow";
+        break;
+    case COLORMAP_OCEAN :
+        colorMapName = "Colormap : Ocean";
+        break;
+    case COLORMAP_SUMMER :
+        colorMapName = "Colormap : Summer";
+        break;
+    case COLORMAP_SPRING :
+        colorMapName = "Colormap : Spring";
+        break;
+    case COLORMAP_COOL :
+        colorMapName = "Colormap : Cool";
+        break;
+    case COLORMAP_HSV :
+        colorMapName = "Colormap : HSV";
+        break;
+    case COLORMAP_PINK :
+        colorMapName = "Colormap : Pink";
+        break;
+    case COLORMAP_HOT :
+        colorMapName = "Colormap : Hot";
+        break;
+    case COLORMAP_PARULA :
+        colorMapName = "Colormap : Parula";
+        break;
+    default:
+        colorMapName = "User colormap : random";
+        break;
+    }
+    putText(dst, colorMapName, Point(10, 20), cv::FONT_HERSHEY_SIMPLEX, 1, Scalar(255, 255, 255));
+    imshow(winName, dst);
+}
+
+
+static Mat DrawMyImage(int thickness,int nbShape)
+{
+    Mat img=Mat::zeros(500,256*thickness+100,CV_8UC1);
+    int offsetx = 50, offsety = 25;
+    int lineLenght = 50;
+
+    for (int i=0;i<256;i++)
+        line(img,Point(thickness*i+ offsetx, offsety),Point(thickness*i+ offsetx, offsety+ lineLenght),Scalar(i), thickness);
+    RNG r;
+    Point center;
+    int radius;
+    int width,height;
+    int angle;
+    Rect rc;
+
+    for (int i=1;i<=nbShape;i++)
+    {
+        int typeShape = r.uniform(MyCIRCLE, MyELLIPSE+1);
+        switch (typeShape) {
+        case MyCIRCLE:
+            center = Point(r.uniform(offsetx,img.cols- offsetx), r.uniform(offsety + lineLenght, img.rows - offsety));
+            radius = r.uniform(1, min(offsetx, offsety));
+            circle(img,center,radius,Scalar(i),-1);
+            break;
+        case MyRECTANGLE:
+            center = Point(r.uniform(offsetx, img.cols - offsetx), r.uniform(offsety + lineLenght, img.rows - offsety));
+            width = r.uniform(1, min(offsetx, offsety));
+            height = r.uniform(1, min(offsetx, offsety));
+            rc = Rect(center-Point(width ,height )/2, center + Point(width , height )/2);
+            rectangle(img,rc, Scalar(i), -1);
+            break;
+        case MyELLIPSE:
+            center = Point(r.uniform(offsetx, img.cols - offsetx), r.uniform(offsety + lineLenght, img.rows - offsety));
+            width = r.uniform(1, min(offsetx, offsety));
+            height = r.uniform(1, min(offsetx, offsety));
+            angle = r.uniform(0, 180);
+            ellipse(img, center,Size(width/2,height/2),angle,0,360, Scalar(i), -1);
+            break;
+        }
+    }
+    return img;
+}
+
+int main(int argc, const char *argv[])
+{
+    ParamColorMar  p;
+
+    Mat img= DrawMyImage(2,256);
+    p.img=img;
+    p.iColormap=0;
+
+    imshow("Gray image",img);
+    namedWindow(winName);
+    createTrackbar("colormap", winName,&p.iColormap,1,TrackColorMap,(void*)&p);
+    setTrackbarMin("colormap", winName, cv::COLORMAP_AUTUMN);
+    setTrackbarMax("colormap", winName, cv::COLORMAP_PARULA+1);
+    setTrackbarPos("colormap", winName, -1);
+
+    TrackColorMap(0,(void*)&p);
+    waitKey(0);
+    return 0;
+}
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