title: how to visualize the bag-of-word codebook(image classification)?
body: <p>I want to use bag-of-word feature on image classification, and how to visualize the codebook?
  I use keypoint-sift then kmeans to do clustering.
  e.g., <a href="http://fias.uni-frankfurt.de/~triesch/courses/260object/papers/Fei-Fei_CVPR2005.pdf" rel="nofollow">http://fias.uni-frankfurt.de/~triesch/courses/260object/papers/Fei-Fei_CVPR2005.pdf</a> (figure 4)</p>