added sample on color generation and updated sample on lsvm

samples/cpp/gencolors.cpp

@@ -0,0 +1,35 @@
+#include "opencv2/imgproc/imgproc.hpp"
+#include "opencv2/contrib/contrib.hpp"
+#include "opencv2/highgui/highgui.hpp"
+
+#include <cstdio>
+#include <iostream>
+
+using namespace cv;
+using namespace std;
+
+int main(int argc, char** argv)
+{
+    if( argc != 2 )
+    {
+        cout << "Colors count should be passed." << endl;
+        return -1;
+    }
+
+    int colorsCount = atoi(argv[1]);
+    vector<Scalar> colors;
+    theRNG() = (uint64)time(0);
+    generateColors( colors, colorsCount );
+
+    int stripWidth = 20;
+    Mat strips(300, colorsCount*stripWidth, CV_8UC3);
+    for( int i = 0; i < colorsCount; i++ )
+    {
+        strips.colRange(i*stripWidth, (i+1)*stripWidth) = colors[i];
+    }
+
+    imshow( "strips", strips );
+    waitKey();
+
+    return 0;
+}