Correcting Document Image Warping Based on Regression of Curved Text Lines
ICDAR '03 Proceedings of the Seventh International Conference on Document Analysis and Recognition - Volume 1
Document Image Dewarping using Robust Estimation of Curled Text Lines
ICDAR '05 Proceedings of the Eighth International Conference on Document Analysis and Recognition
Pixel-Accurate Representation and Evaluation of Page Segmentation in Document Images
ICPR '06 Proceedings of the 18th International Conference on Pattern Recognition - Volume 01
Handwriting Segmentation Contest
ICDAR '07 Proceedings of the Ninth International Conference on Document Analysis and Recognition - Volume 02
Segmentation Based Recovery of Arbitrarily Warped Document Images
ICDAR '07 Proceedings of the Ninth International Conference on Document Analysis and Recognition - Volume 02
Script-Independent Text Line Segmentation in Freestyle Handwritten Documents
IEEE Transactions on Pattern Analysis and Machine Intelligence
Performance Evaluation and Benchmarking of Six-Page Segmentation Algorithms
IEEE Transactions on Pattern Analysis and Machine Intelligence
Document cleanup using page frame detection
International Journal on Document Analysis and Recognition
A Two-Step Dewarping of Camera Document Images
DAS '08 Proceedings of the 2008 The Eighth IAPR International Workshop on Document Analysis Systems
Segmentation of Curled Textlines Using Active Contours
DAS '08 Proceedings of the 2008 The Eighth IAPR International Workshop on Document Analysis Systems
Ridges Based Curled Textline Region Detection from Grayscale Camera-Captured Document Images
CAIP '09 Proceedings of the 13th International Conference on Computer Analysis of Images and Patterns
Script-Independent Handwritten Textlines Segmentation Using Active Contours
ICDAR '09 Proceedings of the 2009 10th International Conference on Document Analysis and Recognition
Coupled Snakelet Model for Curled Textline Segmentation of Camera-Captured Document Images
ICDAR '09 Proceedings of the 2009 10th International Conference on Document Analysis and Recognition
The restoration of camera documents through image segmentation
DAS'06 Proceedings of the 7th international conference on Document Analysis Systems
Snakes, shapes, and gradient vector flow
IEEE Transactions on Image Processing
ECCV'10 Proceedings of the 11th European conference on Computer vision: Part II
A new algorithm for segmenting warped text-lines in document images
Proceedings of the 2011 ACM Symposium on Applied Computing
A new method for text-line segmentation for warped documents
ICIAR'10 Proceedings of the 7th international conference on Image Analysis and Recognition - Volume Part II
Hi-index | 0.00 |
Cameras offer flexible document imaging, but with uneven shading and non-planar page shape. Therefore cameracaptured documents need to go through dewarping before being processed by traditional text recognition methods. Curled textline detection is an important step of dewarping. Previous approaches of curled textline detection use binarization as a pre-processing step, which can negatively affect the detection results under uneven shading. Furthermore, these approaches are sensitive to high degrees of curl and estimate x-line1 and baseline pairs using regression which may result in inaccurate estimation. We introduce a novel curled textline detection approach for grayscale document images. First, the textline structure is enhanced by using match filter bank smoothing and then central lines of textlines are detected using ridges. Then, x-line and baseline pairs are estimated by adapting active contours (snakes) over ridges. Unlike other approaches, our approach does not use binarization and applies directly on grayscale images. We achieved 91% of detection accuracy with good estimation of x-line and baseline pairs on the dataset of CBDAR 2007 document image dewarping contest.