Unsupervised Word Spotting in Historical Handwritten Document Images Using Document-Oriented Local Features

IEEE Trans Image Process. 2017 Aug;26(8):4032-4041. doi: 10.1109/TIP.2017.2700721. Epub 2017 May 3.

Abstract

Word spotting strategies employed in historical handwritten documents face many challenges due to variation in the writing style and intense degradation. In this paper, a new method that permits effective word spotting in handwritten documents is presented that it relies upon document-oriented local features, which take into account information around representative keypoints as well a matching process that incorporates spatial context in a local proximity search without using any training data. Experimental results on four historical handwritten data sets for two different scenarios (segmentation-based and segmentation-free) using standard evaluation measures show the improved performance achieved by the proposed methodology.