Text Line Segmentation for Challenging Handwritten Document Images Using Fully Convolutional Network
This work addresses the problem of accurately segmenting text lines in difficult handwritten documents for researchers and archivists, but it is incremental as it applies an existing method to a more challenging dataset.
The paper tackles text line segmentation in challenging historical manuscript images with narrow interlines and complex layouts by using a Fully Convolutional Network (FCN) to predict line masks, achieving results comparable to previous work on a public dataset as measured by a new evaluation metric sensitive to over- and under-segmentation.
This paper presents a method for text line segmentation of challenging historical manuscript images. These manuscript images contain narrow interline spaces with touching components, interpenetrating vowel signs and inconsistent font types and sizes. In addition, they contain curved, multi-skewed and multi-directed side note lines within a complex page layout. Therefore, bounding polygon labeling would be very difficult and time consuming. Instead we rely on line masks that connect the components on the same text line. Then these line masks are predicted using a Fully Convolutional Network (FCN). In the literature, FCN has been successfully used for text line segmentation of regular handwritten document images. The present paper shows that FCN is useful with challenging manuscript images as well. Using a new evaluation metric that is sensitive to over segmentation as well as under segmentation, testing results on a publicly available challenging handwritten dataset are comparable with the results of a previous work on the same dataset.