'**SUMMARY**
Initializes all the required parameters and attributes of the class.
**PARAMETERS**
* *img* - SimpleCV.ImageClass.Image
* *bb* - A tuple consisting of (x, y, w, h) of the bounding box
* *pts* - List of all the tracking points
**RETURNS**
SimpleCV.Tracking.TrackClass.LKTrack object
**EXAMPLE**
>>> track = LKTrack(image, bb, pts)'

def __init__(self, img, bb, pts):

    self = Track.__init__(self, img, bb)
    self.pts = pts
