The variational approach to shape from shading
Computer Vision, Graphics, and Image Processing
A Method for Enforcing Integrability in Shape from Shading Algorithms
IEEE Transactions on Pattern Analysis and Machine Intelligence
Fronts propagating with curvature-dependent speed: algorithms based on Hamilton-Jacobi formulations
Journal of Computational Physics
A viscosity solutions approach to shape-from-shading
SIAM Journal on Numerical Analysis
Tracking level sets by level sets: a method for solving the shape from shading problem
Computer Vision and Image Understanding
IEEE Transactions on Pattern Analysis and Machine Intelligence
Automatic Caption Localization in Compressed Video
IEEE Transactions on Pattern Analysis and Machine Intelligence
Proceedings of the 27th annual conference on Computer graphics and interactive techniques
An Introduction to Digital Image Processing
An Introduction to Digital Image Processing
Optimal Algorithm for Shape from Shading and Path Planning
Journal of Mathematical Imaging and Vision
Smooth surface reconstruction from noisy range data
Proceedings of the 1st international conference on Computer graphics and interactive techniques in Australasia and South East Asia
Restoration of Archival Documents Using a Wavelet Technique
IEEE Transactions on Pattern Analysis and Machine Intelligence
Recovering Shading from Color Images
ECCV '92 Proceedings of the Second European Conference on Computer Vision
Shape from Shading and Viscosity Solutions
ECCV '02 Proceedings of the 7th European Conference on Computer Vision-Part II
IWFHR '02 Proceedings of the Eighth International Workshop on Frontiers in Handwriting Recognition (IWFHR'02)
Edge-Based Method for Text Detection from Complex Document Images
ICDAR '01 Proceedings of the Sixth International Conference on Document Analysis and Recognition
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
A Cylindrical Surface Model to Rectify the Bound Document Image
ICCV '03 Proceedings of the Ninth IEEE International Conference on Computer Vision - Volume 2
A New Perspective [on] Shape-from-Shading
ICCV '03 Proceedings of the Ninth IEEE International Conference on Computer Vision - Volume 2
Lax-Friedrichs sweeping scheme for static Hamilton-Jacobi equations
Journal of Computational Physics
Recovering the Shading Image under Known Illumination
CRV '04 Proceedings of the 1st Canadian Conference on Computer and Robot Vision
Image Restoration of Arbitrarily Warped Documents
IEEE Transactions on Pattern Analysis and Machine Intelligence
ICPR '04 Proceedings of the Pattern Recognition, 17th International Conference on (ICPR'04) Volume 1 - Volume 01
3D Geometric and Optical Modeling of Warped Document Images from Scanners
CVPR '05 Proceedings of the 2005 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR'05) - Volume 1 - Volume 01
Conformal Deskewing of Non-Planar Documents
CVPR '05 Proceedings of the 2005 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR'05) - Volume 1 - Volume 01
Recovering Intrinsic Images from a Single Image
IEEE Transactions on Pattern Analysis and Machine Intelligence
Opaque Document Imaging: Building Images of Inaccessible Texts
ICCV '05 Proceedings of the Tenth IEEE International Conference on Computer Vision (ICCV'05) Volume 1 - Volume 01
Geometric and Photometric Restoration of Distorted Documents
ICCV '05 Proceedings of the Tenth IEEE International Conference on Computer Vision - Volume 2
A Fast and Stable Approach for Restoration of Warped Document Images
ICDAR '05 Proceedings of the Eighth International Conference on Document Analysis and Recognition
Towards Restoring Historic Documents Degraded Over Time
DIAL '06 Proceedings of the Second International Conference on Document Image Analysis for Libraries
Video Mosaicing for Curved Documents Based on Structure from Motion
ICPR '06 Proceedings of the 18th International Conference on Pattern Recognition - Volume 04
A Unifying and Rigorous Shape from Shading Method Adapted to Realistic Data and Applications
Journal of Mathematical Imaging and Vision
International Journal on Document Analysis and Recognition
Proceedings of the 2007 ACM symposium on Applied computing
Thresholding of badly illuminated document images through photometric correction
Proceedings of the 2007 ACM symposium on Document engineering
Shape from shading for the digitization of curved documents
Machine Vision and Applications
ICDAR '07 Proceedings of the Ninth International Conference on Document Analysis and Recognition - Volume 02
An Improved Physically-Based Method for Geometric Restoration of Distorted Document Images
IEEE Transactions on Pattern Analysis and Machine Intelligence
Photometric and geometric restoration of document images using inpainting and shape-from-shading
AAAI'07 Proceedings of the 22nd national conference on Artificial intelligence - Volume 2
Fast marching method for generic shape from shading
VLSM'05 Proceedings of the Third international conference on Variational, Geometric, and Level Set Methods in Computer Vision
Automatic text detection and tracking in digital video
IEEE Transactions on Image Processing
Geometric and shading correction for images of printed materials using boundary
IEEE Transactions on Image Processing
Visual enhancement of old documents with hyperspectral imaging
Pattern Recognition
Segment confidence-based binary segmentation (SCBS) for cursive handwritten words
Expert Systems with Applications: An International Journal
A combined approach for the binarization of handwritten document images
Pattern Recognition Letters
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We present a restoration framework to reduce undesirable distortions in imaged documents. Our framework is based on two components: (1) an image inpainting procedure that can separate non-uniform illumination (and other) artifacts from the printed content and (2) a shape-from-shading (SfS) formulation that can reconstruct the 3D shape of the document's surface. Used either piecewise or in its entirety, this framework can correct a variety of distortions including shading, shadow, ink-bleed, show-through, perspective and geometric distortions, for both camera-imaged and flatbed-imaged documents. Our overall framework is described in detail. In addition, our SfS formulation can be easily modified to target various illumination conditions to suit different real-world applications. Results on images of synthetic and real documents demonstrate the effectiveness of our approach. OCR results are also used to gauge the performance of our approach.