@article {19694, title = {Structural similarity for document image classification and retrieval}, journal = {Pattern Recognition Letters}, year = {2013}, month = {2013/00/01}, abstract = {Abstract This paper presents a novel approach to defining document image structural similarity for the applications of classification and retrieval. We first build a codebook of SURF descriptors extracted from a set of representative training images. We then encode ...}, doi = {10.1016/j.patrec.2013.10.030}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0167865513004224}, author = {Kumar, Jayant and Ye, Peng and David Doermann} }