how can live tracking be done using blobAnalysis by applying color thresholds after changing few properties of the video acquisition ? kindly correct my code where ever u think its senseless or wrong..thank u

vid = videoinput('winvideo', 1, 'YUY2_640x360');
src = getselectedsource(vid);
vid.FramesPerTrigger = 15;
src.Brightness = 65;
src.Contrast = 3;
src.Exposure = -7;
vid.ReturnedColorspace = 'rgb';
src.FocusMode = 'manual';
src.FrameRate = '15.0000';
hblob = vision.BlobAnalysis('AreaOutputPort', false,'CentroidOutputPort', true,  'BoundingBoxOutputPort', true','MinimumBlobArea',10);
videoPlayer = vision.VideoPlayer('Name', 'bot motion');
nframe=0;
while (nframe <1000)
 frame =getsnapshot(vid);
 red=frame(:,:,1);
 green=frame(:,:,2);
 blue=frame(:,:,3);
 f=red>=0.5607 & red<=0.9333 & green>=0.2078 & green<=0.7098 & blue>=0.2509 & blue<=0.8215;
 diff= medfilt2(f,[3 3]);
 g=bwlabel(diff,4);
[Centroid, bbox] = step(hblob,diff); 
Centroid = uint16(Centroid); 
result = insertShape(frame, 'Rectangle', bbox, 'Color', 'green');

for object = 1:1:length(bbox(:,1))
X = Centroid(object,1); 
Y =Centroid(object,2);
X
Y
end
step(videoPlayer, result); 
nframe=nframe+1;
end
release(videoPlayer);
release(vid);

Answer 1

[Image Analyst]

Here's a recent paper on tracking moving objects in live video: http://electronicimaging.spiedigitallibrary.org/article.aspx?articleid=2583607

[JENNIFER JACOB]

sir,this didnot answer my query..its in the code where i want the help..also,when same colored stickers are used on the moving object, i gave the color threshold values,then i dont understand if there's is any way or any change tat could be done in the program i've given such that it doesnot detect any other surrounding objects.

[Image Analyst]

See my attached demo where I track the green on a Sharpie marker. It might help you.

[JENNIFER JACOB]

thank you sir!

Answer 2

[JENNIFER JACOB]

what is the significance of Median filter for video processing apart from noise removal and edge preservation? there are many other filters ...so why it is always Median filter?

[Image Analyst]

It's very simple and well known, and probably faster than other methods that may perhaps be better but slower and more complicated.