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Topic: 3D Model Acquisition by Tracking 2D Wireframes
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travestiaPerson was signed in when posted  23
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Diem Vu  11
11-25-2003 01:55 PM ET (US)
A last minute comment: is it possible (and better ?) to track the whole line, (less d.o.f --> faster), then somehow snap it to the line segment? I remember this in some paper by Prof. Kriegman. Don't know if the idea can be used in here.
Jing Shiau  10
11-25-2003 12:15 PM ET (US)
Mei-fang raised a good point. Tracking objects with curved edges (e.g. a ball/sphere) would potentially cause problems in the tracking step.
Meifang Huang  9
11-25-2003 02:01 AM ET (US)
All the examples given in this paper are with rigid edges. I'm wondering will this work also be applied on the edges which are not straight or on the curves. One simple method is to divide the crooked contours into several small segment, and find the approximate line for each segment. But this way obviously will increase the error when doing the tracking, moreover, it may bring some bad effect on the model building steps. I agree that intertwining the tracking and model building is really a good idea, it utilizes the previous tracking result to provide a robust model, kind of information recycling, and this may also avoid dramatic drift when the initial model is not good enough.
Jing Shiau  8
11-25-2003 12:54 AM ET (US)
The system introduced in the paper does two things: tracking and model building.

It is assumed that manually input edges using the mouse (point, click and drag) is fairly easy to do and doesn't take a lot of time. Simple edge detection doesn't know which edges are more important than others, so higher level user input is needed to specify which edges to track.

This approach itself can be called a model-based tracker, but the initial model doesn't have to be completely accurate. One a model is obtained from the system, it can be used in other areas. It can be used for tracking the same object in other videos, or simply a wireframe model for rendering a synthetic video.
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