Aleksandra Mojsilovic Jianying Hu Emina Soljanin Extraction of perceptually important colors and similarity measurement for image matching, retrieval and analysis. 1238-1248 2002 11 IEEE Transactions on Image Processing 11 http://dx.doi.org/10.1109/TIP.2002.804260 db/journals/tip/tip11.html#MojsilovicHS02