Test with new Multi Finger Tracking

We tested a bigger video file about 2.30 minutes with the new program me and kyle wrote. It could successfully run. :)

However we figured out that this video is not a regular type video. In this video the user did not put their fingers immediately rather delayed couple of seconds before starting exploring the map.

This led us the question :

1)What if the user make delay to explore the map?

Ans: This was a problem because we were loading the first frame to track to give the user an opportunity to select finger tip. Now we decided we can put a slider and load all frames. User would slide to a frame where the finger is visible and click to the finger tip. However we might not need all frames to load at the beginning , I think couple of frames should be enough. This can save time.

Again sometimes users were removing hands from maps so frames with no finger at all are possible.

This led us the question :

2)What if finger moves out of the window, and then comes in at a completely different area?
Ans: We can just put the center as a negative value say , (-1,-1) in our xml file indicating no finger were visible to track in this frame.

We were tracking finger tips in a particular rectangle thinking finger movement won't be that fast and saving search time. But there might be situations user moved out hands to a completely different area or out side the map or moved very fast exceeding the considered search space.

This lead to question:

3) If center is not found the next search space in the frame, then how to search?

Ans: Simple way is to search every pixels in the frame considering the whole pixel grid rather a the previously considered small space. This should work if finger is moved out fast or to a different area. But if finger is outside the frame then put some -ve values as centroid say (-1,-1)