MatchingTracker Class

public class MatchingTracker : IObjectTracker

Public Class MatchingTracker
	Implements IObjectTracker

// Let's test the tracker using a sample video from 
// the collection of test videos in the framework:
TestVideos ds = new TestVideos(basePath);
string fileName = ds["walking.mp4"];

// Now, let's open the video using FFMPEG:
var video = new VideoFileReader();
video.Open(fileName);

// And then check the contents of one of the frames:
Bitmap frame = video.ReadVideoFrame(frameIndex: 150);
frame.Save(Path.Combine(basePath, "walking_frame.png"));

// Let's register a template for the bike rider in gray shirt
Rectangle roi = new Rectangle(x: 70, y: 105, width: 28, height: 54);

// initialization
var tracker = new MatchingTracker()
{
    SearchWindow = roi,
    Threshold = 0.0, // never reset the tracker in case it gets lost
    RegistrationThreshold = 0.95 // re-register the template if we are 95% 
    // confident that the tracked object is indeed the object we want to follow
};

// Creating bitmaps and locking them is an expensive 
// operation. Instead, let's allocate once and reuse
BitmapData bitmapData = frame.LockBits(ImageLockMode.ReadWrite);
UnmanagedImage unmanagedImage = new UnmanagedImage(bitmapData);

// We will create two color markers: one to show the location of the
// tracked object (red) and another one to show the regions of the image
// that the tracker is looking at (white).
RectanglesMarker objectMarker = new RectanglesMarker(Color.Red);
RectanglesMarker windowMarker = new RectanglesMarker(Color.White);

// Now, for each frame of the video
for (int frameIndex = 0; frameIndex < video.FrameCount; frameIndex++)
{
    // Read the current frame into the bitmap data
    video.ReadVideoFrame(frameIndex, bitmapData);

    if (frameIndex > 150) // wait until the bike rider enters the scene
    {
        // Feed the frame to the tracker
        tracker.ProcessFrame(unmanagedImage);

        // Mark the location of the tracker object in red color
        objectMarker.SingleRectangle = tracker.TrackingObject.Rectangle;
        objectMarker.ApplyInPlace(unmanagedImage); // overwrite the frame

        windowMarker.SingleRectangle = tracker.SearchWindow;
        windowMarker.ApplyInPlace(unmanagedImage); // overwrite the frame
    }

    // Save it to disk
    frame.Save(Path.Combine(basePath, "frame_{0}.png".Format(frameIndex)));
}

frame.UnlockBits(bitmapData);