Input sensitive thresholding for ancient Hebrew manuscript
Pattern Recognition Letters
Proceedings of the 2007 ACM symposium on Applied computing
A quantitative method for assessing algorithms to remove back-to-front interference in documents
Proceedings of the 2007 ACM symposium on Applied computing
An objective way to evaluate and compare binarization algorithms
Proceedings of the 2008 ACM symposium on Applied computing
DIAR: Advances in Degradation Modeling and Processing
ICIAR '08 Proceedings of the 5th international conference on Image Analysis and Recognition
RSLDI: Restoration of single-sided low-quality document images
Pattern Recognition
An algorithm for foreground-background separation in low quality patrimonial document images
CIARP'07 Proceedings of the Congress on pattern recognition 12th Iberoamerican conference on Progress in pattern recognition, image analysis and applications
Multichannel blind separation and deconvolution of images for document analysis
IEEE Transactions on Image Processing
Color space transformations for analysis and enhancement of ancient degraded manuscripts
Pattern Recognition and Image Analysis
Merge techniques for large multiple-pass scanned images
VIS'08 Proceedings of the 1st WSEAS international conference on Visualization, imaging and simulation
Identifying Join Candidates in the Cairo Genizah
International Journal of Computer Vision
Handwriting documents denoising and indexing using hermite transform
ICAPR'05 Proceedings of the Third international conference on Advances in Pattern Recognition - Volume Part I
Cleaning and enhancing historical document images
ACIVS'05 Proceedings of the 7th international conference on Advanced Concepts for Intelligent Vision Systems
DAS'06 Proceedings of the 7th international conference on Document Analysis Systems
Extraction of handwritten text from carbon copy medical form images
DAS'06 Proceedings of the 7th international conference on Document Analysis Systems
VAST'06 Proceedings of the 7th International conference on Virtual Reality, Archaeology and Intelligent Cultural Heritage
Methods for written ancient music restoration
ICIAR'07 Proceedings of the 4th international conference on Image Analysis and Recognition
Generating color documents from segmented and synthetic elements
ICIAR'07 Proceedings of the 4th international conference on Image Analysis and Recognition
Hi-index | 0.00 |
Before any processing of the textual content of a document image can be performed the text must be separated from the background of the image. Several thresholding algorithms have previously been proposed and are widely used in document processing. None have been shown effective at thresholding difficult documents where the background and foreground are nonuniform. In this paper we investigate the use of three global thresholding algorithms (Otsu's, Kapur's entropy and Solihin's quadratic integral ratio (QIR)) as the first stage in a multi-stage thresholding algorithm for use in degraded document images. It is concluded that Otsu's and Kapur's algorithms do not work well for difficult documents as they tend to over-threshold the image, thus losing much of the useful information. The QIR algorithm is more accurate in separating the foreground and background in these images, leaving a range of undecided, fuzzy, pixels for later processing in a subsequent stage.