He-Ping Song Qun-Sheng Yang Yin-Wei Zhan Semantic Discriminative Projections for Image Retrieval. 34-43 2008 AIRS http://dx.doi.org/10.1007/978-3-540-68636-1_4 conf/airs/2008 db/conf/airs/airs2008.html#SongYZ08