embirico/basketball-object-tracker

CS 231 Project Winter 2014

basketball-object-tracker

CS 231 Project Winter 2014

Project to perform single-view 3D reconstruction of basketball scenes using commonly available TV footage of games.

Our main objective is to identify location of court relative to camera.

Source code is located in the src directory:

• To get an understanding of how the 4-point selection works, look at image_object.py, which calls most other files. (This script can be run without arguments.)
• The homography estimation is done in homography.py. (This script can be run without arguments.)
• Frame extraction is done in extract_frames.py. (This script requires arguments, which you can find by running with -h.)

basketball-object-tracker's Issues

Fixing homography

Ok so last night we couldn't get the homography to work for our manual points.

Not sure what's wrong, but I managed to get it to work on a simple case.

To test, leaving things as were, i defined a new manual point which is identical to the model:

"test_left" : {
    "sideline, freethrow":{
        "x": 226,
        "y": 0
    },
    "sideline, baseline": {
        "x": 0,
        "y": 0
    },
    "closepaint, baseline": {
        "x": 0,
        "y": 396
    },
    "closepaint, freethrow": {
        "x": 226,
        "y": 396
    }
}

homography has good output for that:

>> python src/homography.py 
[[  1.00000000e+00   5.83877413e-17  -7.83591399e-14]
 [ -8.01464308e-16   1.00000000e+00   6.69300702e-15]
 [  2.72174920e-17   1.12957159e-17   1.00000000e+00]]
sideline, baseline
[[0], [0], [1]]
{u'y': 0, u'x': 0}
[[ -7.83591399e-14]
 [  6.69300702e-15]
 [  1.00000000e+00]]
closepaint, freethrow
[[226], [396], [1]]
{u'y': 396, u'x': 226}
[[ 226.]
 [ 396.]
 [   1.]]
sideline, freethrow
[[226], [0], [1]]
{u'y': 0, u'x': 226}
[[  2.26000000e+02]
 [ -1.74437927e-13]
 [  1.00000000e+00]]
closepaint, baseline
[[0], [396], [1]]
{u'y': 396, u'x': 0}
[[ -5.52375944e-14]
 [  3.96000000e+02]
 [  1.00000000e+00]]

Will keep looking...