Jayant Kumar Rohit Prasad Huaigu Cao Wael Abd-Almageed David S. Doermann Premkumar Natarajan Shape codebook based handwritten and machine printed text zone extraction. 787406 2011 DRR https://doi.org/10.1117/12.876725 conf/drr/2011 db/conf/drr/drr2011.html#KumarPCADN11