2 ms·

This doesn’t really answer the question. The camera can only see the non-occluded portions of the plane. Since Thompson’s left shoulder is not visible in the im

by amluto 2y ago

This doesn’t really answer the question. The camera can only see the non-occluded portions of the plane. Since Thompson’s left shoulder is not visible in the image, we know that his shoulder crossed the image plane at a time at which it was occluded by his head. But without extrapolation, it’s not clear to me that we know when his shoulder crossed the line.

johndhi 2y ago
Good point. I guess if you're occluded to the camera, I was assuming the presumption is you haven't crossed the line. But it could still be arguable that he did cross the camera's finish line, it was just occluded.
gamblor956 2y ago
It doesn't matter when Thompson's shoulder crossed the finish line, since the shoulder is not part of the torso. The torso was chosen as the body part for determining when a runner crosses the finish line precisely because torsos were easy to identify/distinguish and there is no ambiguity as to a runner's torso.
- johndhi 2y ago
  you don't think shoulder is part of torso?
  - adolph 2y ago
    The exact location of the border line between the upper arm / shoulder and the “torso” would vary depending on the development of the upper body of an individual athlete and would not therefore be totally consistent. Based on anatomy, we can say that the endpoint of the torso is the outer end / articulation of the collarbone (clavicle). Although the pelvic area is anatomically part of the torso, for consistency in photo finish judging, it is more practical to define the lower end of the torso as the horizontal cross section of the body through the hip line . . . IAAF Photo Finish Guidelines (June 2015): https://worldathletics.org/download/download?filename=4423f7ca-84bd-401d-b326-c074cebc4800.pdf&urlslug=Photo+Finish+Guidelines https://worldathletics.org/download/download?filename=4423f7...

2 ms·

This doesn’t really answer the question. The camera can only see the non-occluded portions of the plane. Since Thompson’s left shoulder is not visible in the im

by amluto 2y ago

johndhi 2y ago
Good point. I guess if you're occluded to the camera, I was assuming the presumption is you haven't crossed the line. But it could still be arguable that he did cross the camera's finish line, it was just occluded.
gamblor956 2y ago
It doesn't matter when Thompson's shoulder crossed the finish line, since the shoulder is not part of the torso. The torso was chosen as the body part for determining when a runner crosses the finish line precisely because torsos were easy to identify/distinguish and there is no ambiguity as to a runner's torso.
- johndhi 2y ago
  you don't think shoulder is part of torso?
  - adolph 2y ago
    The exact location of the border line between the upper arm / shoulder and the “torso” would vary depending on the development of the upper body of an individual athlete and would not therefore be totally consistent. Based on anatomy, we can say that the endpoint of the torso is the outer end / articulation of the collarbone (clavicle). Although the pelvic area is anatomically part of the torso, for consistency in photo finish judging, it is more practical to define the lower end of the torso as the horizontal cross section of the body through the hip line . . . IAAF Photo Finish Guidelines (June 2015): https://worldathletics.org/download/download?filename=4423f7ca-84bd-401d-b326-c074cebc4800.pdf&urlslug=Photo+Finish+Guidelines https://worldathletics.org/download/download?filename=4423f7...