Title :
Affine Invariant Recognition of Characters by Progressive Pruning
Author :
Horimatsu, Akira ; Niwa, Ryo ; Iwamura, Masakazu ; Kise, Koichi ; Uchida, Seiichi ; Omachi, Shinichiro
Author_Institution :
Osaka Pref. Univ., Osaka
Abstract :
There are many problems to realize camera-based character recognition. One of the problems is that characters in scenes are often distorted by geometric transformations such as affine distortions. Although some methods that remove the affine distortions have been proposed, they cannot remove a rotation transformation of a character. Thus a skew angle of a character has to be determined by examining all the possible angles. However, this consumes quite a bit of time. In this paper, in order to reduce the processing time for an affine invariant recognition, we propose a set of affine invariant features and a new recognition scheme called "progressive pruning."\´ The progressive pruning gradually prunes less feasible categories and skew angles using multiple classifiers. We confirmed the progressive pruning with the affine invariant features reduced the processing time at least less than half without decreasing the recognition rate.
Keywords :
character recognition; affine distortions; affine invariant character recognition; camera-based character recognition; geometric transformations; progressive pruning; Character recognition; Digital cameras; Equations; Image recognition; Layout; Mobile handsets; Parameter estimation; Shape; Text analysis; Text recognition;
Conference_Titel :
Document Analysis Systems, 2008. DAS '08. The Eighth IAPR International Workshop on
Conference_Location :
Nara
Print_ISBN :
978-0-7695-3337-7
DOI :
10.1109/DAS.2008.88