1. A system to capture an image and determine a position of an object, comprising: a hand-held personal digital assistant (PDA); a camera communicatively coupled to the hand-held PDA to capture an image while the PDA is hand-held; a first processing module to recognize a set of predetermined landmarks, including a first landmark and remainder landmarks, in the image; a second processing module to determine an actual location of the first landmark in the image, the actual location of the first landmark representing a single constraint, and apply at least one filtering scheme to estimate positions of the remainder landmarks in the image based on the actual location of the first landmark representing the single constraint; a third processing module to determine a pose of the object based on the actual location of the first landmark representing the single constraint and the estimated positions of the remainder landmarks; and a rendering module to calculate a three-dimensional (3-D) representation of the image using the pose of the object based on the actual location of the first landmark representing the single constraint and the estimated positions of the remainder landmarks.