Comments by ramrudram (Top 3 by date)

Is it possible to extract the library filename somehow

OpenCV CamShift

#include <opencv2 video="" tracking.hpp="">
#include <opencv2 imgproc="" imgproc.hpp="">
#include <opencv2 highgui="" highgui.hpp="">

#include <iostream>
#include <ctype.h>

using namespace cv;
using namespace std;

void help()
{
cout << "\nThis is a demo that shows mean-shift based tracking\n"
<< "You select a color objects such as your face and it tracks it.\n"
<< "This reads from video camera (0 by default, or the camera number the user enters\n"
<< "Call:\n"
<< "\n./camshiftdemo [camera number]"
<< "\n" << endl;

cout << "\n\nHot keys: \n"
"\tESC - quit the program\n"
"\tc - stop the tracking\n"
"\tb - switch to/from backprojection view\n"
"\th - show/hide object histogram\n"
"To initialize tracking, select the object with mouse\n" << endl;
}

Mat image;

bool backprojMode = false;
bool selectObject = false;
int trackObject = 0;
bool showHist = true;
Point origin;
Rect selection;
int vmin = 10, vmax = 256, smin = 30;

void onMouse( int event, int x, int y, int, void* )
{
if( selectObject )
{
selection.x = MIN(x, origin.x);
selection.y = MIN(y, origin.y);
selection.width = std::abs(x - origin.x);
selection.height = std::abs(y - origin.y);

selection &= Rect(0, 0, image.cols, image.rows);
}

switch( event )
{
case CV_EVENT_LBUTTONDOWN:
origin = Point(x,y);
selection = Rect(x,y,0,0);
selectObject = true;
break;
case CV_EVENT_LBUTTONUP:
selectObject = false;
if( selection.width > 0 && selection.height > 0 )
trackObject = -1;
break;
}
}



int main( int argc, char** argv )
{
VideoCapture cap;
Rect trackWindow;
RotatedRect trackBox;
int hsize = 16;
float hranges[] = {0,180};
const float* phranges = hranges;

if( argc == 1 || (argc == 2 && strlen(argv[1]) == 1 && isdigit(argv[1][0])))
cap.open(argc == 2 ? argv[1][0] - '0' : 0);
else if( argc == 2 )
cap.open(argv[1]);

if( !cap.isOpened() )
{
help();
cout << "***Could not initialize capturing...***\n";
return 0;
}

help();

namedWindow( "Histogram", 1 );
namedWindow( "CamShift Demo", 1 );
setMouseCallback( "CamShift Demo", onMouse, 0 );
createTrackbar( "Vmin", "CamShift Demo", &vmin, 256, 0 );
createTrackbar( "Vmax", "CamShift Demo", &vmax, 256, 0 );
createTrackbar( "Smin", "CamShift Demo", &smin, 256, 0 );

Mat hsv, hue, mask, hist, histimg = Mat::zeros(200, 320, CV_8UC3), backproj;

for(;;)
{
Mat frame;
cap >> frame;
if( frame.empty() )
break;

frame.copyTo(image);
cvtColor(image, hsv, CV_BGR2HSV);

if( trackObject )
{
int _vmin = vmin, _vmax = vmax;

inRange(hsv, Scalar(0, smin, MIN(_vmin,_vmax)),
Scalar(180, 256, MAX(_vmin, _vmax)), mask);
int ch[] = {0, 0};
hue.create(hsv.size(), hsv.depth());
mixChannels(&hsv, 1, &hue, 1, ch, 1);

if( trackObject < 0 )
{
Mat roi(hue, selection), maskroi(mask, selection);
calcHist(&roi, 1, 0, maskroi, hist, 1, &hsize, &phranges);
normalize(hist, hist, 0, 255, CV_MINMAX);

trackWindow = selection;
trackObject = 1;

histimg = Scalar::all(0);
int binW = histimg.cols / hsize;
Mat buf(1, hsize, CV_8UC3);
for( int i = 0; i < hsize; i++ )
buf.at<vec3b>(i) = Vec3b(saturate_cast<uchar>(i*180./hsize), 255, 255);
cvtColor(buf, buf, CV_HSV2BGR);

for( int i = 0; i < hsize; i++ )
{
int val = saturate_cast<int>(hist.at<float>(i)*histimg.rows/255)