meanshift - Track an object by color.

Calling Sequence

obj_win = meanshift(im, init_win)

obj_win = meanshift(im)

Parameters

• im: Input image which must be a 3-channel image.
• init_win: Initial search window which is a 1x4 matrix [x,y,w,h]. x is the x-coordinate of the left-top window corner. y is the y-coordinate of the left-top window corner. w is the width of the window. h is the height of the window.
• obj_win: Object window which is a 1x4 matrix [x,y,w,h]. x is the x-coordinate of the left-top window corner. y is the y-coordinate of the left-top window corner. w is the width of the window.

Description

The function iterates to find the object center given its back projection and initial position of search window. When using it, please first use obj_win=meanshift(im, init_win) to initialize the tracker, then use obj_win=meanshift(im) to track the object.

Examples

	
    n = aviopen(SCI+'/contrib/sivp-svn-trunk/images/red_car_video.avi');
    im = avireadframe(n); //get a frame
    obj_win = meanshift(im, [12, 6, 39, 13]); //initialize tracker

    while ~isempty(im),
          obj_win = meanshift(im); //meanshift tracking

          im = rectangle(im, obj_win, [0,255,0]);
          imshow(im);

          im = avireadframe(n);
    end;

    aviclose(n);

Authors

Jia Wu <jiawu83[at]gmail.com>

Shiqi Yu <shiqi.yu[at]gmail.com>

Availability

http://sivp.sourceforge.net

See Also

camshift,