Weakly supervised pedestrian detector training by unsupervised prior learning and cue fusion in videos
Kyaw Kyaw Htike, David Hogg · 2014
The growth in the amount of collected video data in the past decade necessitates automated video analysis for which pedestrian detection plays a key role. Training a pedestrian detector using supervised machine learning requires tedious manual annotation of pedestrians in the form of precise bounding boxes. In this paper, we propose a novel weakly supervised algorithm to train a pedestrian detector that only requires annotations of estimated centers of pedestrians instead of bounding boxes. Our algorithm makes use of a pedestrian prior learnt in an unsupervised way from the video and this prior is fused with the given weak supervision information in a principled manner. We show on publicly available datasets that our weakly supervised algorithm reduces the cost of manual annotation by over 4 times while achieving similar performance to a pedestrian detector trained with bounding box annotations.