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reu final pres 080820

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reu final pres 080820

1. 1. Markerless Motion capture frances le august 20, 2008 presented by
2. 2. Goals for this project
3. 3. » Identify major body parts. » Track them. » Update the state of the body at next frame. » Pass the state to Carley.
4. 4. What do all these limbs have in common?
5. 5. » In 2D, the lengths and widths of a limb are constant. » A joint can be found a certain distance from another joint on the same limb in any given frame. » Certain joints such as the shoulder or the middle of the spine do not move very much.
6. 6. Finding Major body parts
7. 7. how i find the bird » look for the highest leftmost point. » find the vector tangent to the body contour curve at that point. » identify the vector perpendicular to that tangent vector. » discover the point (which is generally near the elbow) that best fits the line represented by the perpendicular vector. (and the elbow)
8. 8. » find the point closest to first elbow point found. other elbow points
9. 9. other elbow points » find the point closest to last elbow point found starting from the tip of the hand going counter-clockwise.
10. 10. » find the point closest to second elbow point found starting from the last elbow point going counter-clockwise. other elbow points
11. 11. finding limb info » for each point counter-clockwise from the tip of the hand, we find a point perpendicular to its tangent.
12. 12. » for each point counter-clockwise from the tip of the hand, we find a point perpendicular to its tangent. » both the distance between the two points and their median coordinates are stored. finding limb info
13. 13. » for each point counter-clockwise from the tip of the hand, we find a point perpendicular to its tangent. » both the distance between the two points and their median coordinates are stored. finding limb info
14. 14. » for each point counter-clockwise from the tip of the hand, we find a point perpendicular to its tangent. » both the distance between the two points and their median coordinates are stored. » in addition, we find the vector that best fits the middle points. finding limb info
15. 15. » for each point counter-clockwise from the tip of the hand, we find a point perpendicular to its tangent. » both the distance between the two points and their median coordinates are stored. » in addition, we find the vector that best fits the middle points. » we do this for both the forearm and the upper arm. finding limb info
16. 16. finding joint info » we keep the location of the joint. » we also keep the angle.
17. 17. Problems unsolved
18. 18. the upside down arm » range of cos -1 function requires us to know something about the orientation of the arm. » animation needs to know orientation of the arm.
19. 19. we have gaps
20. 20. Fin (for now)
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