sitting here, 2 days till show. I realised a mask for the videoin-Webcam via trautner-mask. (Is there a better way?) Now contour throws out two more contour-points, logically the two masks on top and on bottom. These two contour points are biasing the result massivelly - the Clusterpoints are weighting to the middle of the screen…
Now the two ways to solve it:
(A) Setting a mask not with trautner, but how?!
(B) Deleting these 2 slices from the contour-spread… How?!