Submitting Your Own Point Set Motion File

You can submit your own point set motion file and run different algorithms on your data. The following conditions should be considered.

The number of frames in a sequence is limited to 50. The number of points in a frame must be less than 500.
An upper estimate for the maximum velocity magnitude is required. Some algorithms use this information to define the search area: where to look for the next point of a trajectory. This estimate is a float value between 0.0 and 100.0.

To select an algorithm that fits your data, you should be aware of the limitations of the algorithms:

• All the algorithms expect no occlusion in the first three frames. Otherwise, an algorithm either refuses to start or gives poor result.

• Sethi-Jain and Rangarajan require that all trajectories extend from the first frame to the last. Temporary occlusions are only allowed. Otherwise, these algorithms refuse to work. In addition, Rangarajan assumes that the correspondences between the first two frames are specified by the order of the points within the two frames. Wrong initialisation will deteriorate the result.

• Hwang does not track exiting points.

• Salari-Sethi breaks a trajectory into two pieces in case of temporary occlusion.

• Sethi-Jain and Salari-Sethi become very slow when number of points exceeds 40 or the number of frames exceeds 15. Consider these limits when using these algorithms.

• IPAN only handles one-frame occlusions. Otherwise, a trajectory is split into two.
  

The point set motion file format:

A single ASCII file is requested, which consists of a file header followed by float feature point coordinates, frame by frame. The header is optional, but if included, it must be at the beginning of the file. The header consists of four rows, followed by a blank row. Any of the four rows can be substituted by a blank one. The rows have the following contents.

• `rows: X'
• `cols: Y'
• `frames: M'
• `points: N'

Here, X and Y are the numbers of image rows and columns, respectively. M is the number of frames in the sequence, N the maximum number of points in a frame. All these numbers are positive integers.

The non-header rows are of two kind: blank rows, and rows consisting of two float values separated by any number of space or tab characters. The float values must be in 'integer.integer' format. One row means one feature point: its vertical and horizontal coordinate. Blank rows serve as separators between the frames.

Example:

rows: 200
cols: 200
frames: 3
points: 4


   111.280      19.668
    96.452      88.614
    80.375     184.798
   115.414      50.610

   112.285      19.260
    98.111      87.145
    80.280     184.867
   114.081      47.087

   113.373      19.036
    99.358      85.539
    80.279     184.868
   112.416      43.638

Click here to submit your own point set motion file and test the tracking algorithms.