PLSA Approach
In a 2005 paper by Fergus et al., pLSA (probabilistic latent semantic analysis) and extensions of this model were applied to the problem of object categorization from image search. pLSA was originally developed for document classification, but has since been applied to computer vision. It makes the assumption that images are documents that fit the bag of words model.
Read more about this topic: Object Categorization From Image Search
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