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cvondrick / vatic

Efficiently Scaling Up Video Annotation with Crowdsourced Marketplaces. IJCV 2012
http://mit.edu/vondrick/vatic/
MIT License
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Interpolation issue- minimum frame change #51

Closed kr-ish closed 7 years ago

kr-ish commented 8 years ago

It seems that interpolation only works correctly across 4 or more frames. If I want to get the right annotation, I have to jump ahead by at least 3 frames. This makes frame by frame correction difficult / impossible. This is a bigger problem when on object comes into frame - if frame by frame correction is attempted, the outside of view attributed is incorrectly interpolated. If anyone else who is facing this problem / knows how to fix it/ knows where to look to fix it could let me know, I would greatly appreciate it. Thanks!

nileshgu commented 7 years ago

Did you find a catch yet? I have recently reduced the frames per second of my video. I made a sub-video out of main video taking only every 10 frames. When I annotate the resulting sub-video, interpolation doesnt work fine and the bounding boxes around the object is always moving.

0wu commented 7 years ago

for the "outside of view attributed is incorrectly interpolated". You may want to set the blow-radius=0 when "load" a task

kr-ish commented 7 years ago

^that's what I ended up doing finally I fixed the outside attribute code by making it identical to the occluded code (removing the interpolation of that attribute using the estimate function), and set the blow-radius to 1 so that interpolation of objects worked across one frame (in which case it's not really interpolating, but it interpolates for 2 or more frames correctly, as opposed to 4 or more).