utkarsh:
How about a normal webcam? We only need the position of the dancers' feet, so, instead of mounting the cameras at the ceiling, we only need to mount them high enough to see the whole stage (say 6 feet). The camera will probably see something like this:
- The viewing angle skews the rectangular stage into a parallelogram.
- We only need to concern ourselves with the dancers' feet (shown in green) and/or body center.
- Instead of tracking absolute distance, we can figure out the ratio of distances from different sides of the stage.
- We can track multiple dancers if needed.
If the camera is kept at 6 feet, it is likely that it will be unable to see the whole stage. In that case, some markers (shown in blue) can be used as references for distance/position. This way we can use multiple cameras to cover the stage. As a bonus, you also get a (crappy) recording of the dance!
I agree!
The only thing is that we cannot use a webcam due to the condition of light.