TY  - JOUR
AU  - Jose Antonio Rodriguez
AU  - Florent Perronnin
AU  - Gemma Sanchez
AU  - Josep Llados
PY  - 2010//
TI  - Unsupervised writer adaptation of whole-word HMMs with application to word-spotting
T2  - PRL
JO  - Pattern Recognition Letters
SP  - 742–749
VL  - 31
IS  - 8
PB  - Elsevier
KW  - Word-spotting
KW  - Handwriting recognition
KW  - Writer adaptation
KW  - Hidden Markov model
KW  - Document analysis
N2  - In this paper we propose a novel approach for writer adaptation in a handwritten word-spotting task. The method exploits the fact that the semi-continuous hidden Markov model separates the word model parameters into (i) a codebook of shapes and (ii) a set of word-specific parameters.Our main contribution is to employ this property to derive writer-specific word models by statistically adapting an initial universal codebook to each document. This process is unsupervised and does not even require the appearance of the keyword(s) in the searched document. Experimental results show an increase in performance when this adaptation technique is applied. To the best of our knowledge, this is the first work dealing with adaptation for word-spotting. The preliminary version of this paper obtained an IBM Best Student Paper Award at the 19th International Conference on Pattern Recognition.
UR  - http://dx.doi.org/10.1016/j.patrec.2010.01.007
N1  - DAG
ID  - Jose Antonio Rodriguez2010
ER  -