Lidon A, Bolaños M, Dimiccoli M, Radeva P, Garolera M, Giró-i-Nieto X. Semantic Summarization of Egocentric Photo Stream Events. In ACM Multimedia 2017 Workshop on Lifelogging Tools and Applications. In Press.  (3.08 MB)


With the rapid increase of users of wearable cameras in recent years and of the amount of data they produce, there is a strong need for automatic retrieval and summarization techniques. This work addresses the problem of automatically summarizing egocentric photo streams captured through a wearable camera by taking an image retrieval perspective. After removing non-informative images by a new CNN-based filter,  images are ranked by relevance to ensure semantic diversity and  finally re-ranked by a novelty criterion to reduce redundancy.  To assess the results, a new evaluation metric is proposed which takes into account the non-uniqueness of the solution. Experimental results applied on a database of 7,110 images from 6 different subjects and evaluated by experts gave 95.74% of experts satisfaction and a Mean Opinion Score of 4.57 out of 5.0.