Detecting knee angle using OpenCV on a CMJ jump from a side view. Note there are white markers used as validation, but they are not used in detection. Detection is based uniquely on black pants.

In green you can see angle from the white markers
In red you can see angle from the black pants

This is part of Chronojump project:
gnome.org/projects/chronojump/

Here is the code related to knee angle:
svn.gnome.org/viewvc/chronojump/trunk/src/angle

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