Run No. Run ID Run Description infMAP (%) training on TV08 data 1 IUPR-TV-M SIFT visual words with maximum entropy 6.1 2 IUPR-TV-MF SIFT with maximum entropy, fused with color+texture and motion (NN matching) 5.9 3 IUPR-TV-S SIFT visual words with SVMs 5.3 4 IUPR-TV-SF SIFT with SVMs, fused with color+texture and motion (NN matching) 6.3 training on YouTube data (no use of standard training sets) 5 IUPR-YOUTUBE-S SIFT visual words with SVMs 2.2 6 IUPR-YOUTUBE-M SIFT visual words with maximum entropy 2.1 We participated in TRECVID's High-level Features task [17] to investigate online video as an alternative data source for concept detector training. Such video material is publicly available in large quantities from portals like YouTube. In our setup, tags provided by users during video upload serve as weak ground truth labels, such that thousands of concepts can be learned without manual annotation effort. On the downside, online video as a domain is complex, and the labels associ...