Layout Recognition of Multi-Kinds of Table-Form Documents
IEEE Transactions on Pattern Analysis and Machine Intelligence
The Space Requirements of Indexing Under Perspective Projections
IEEE Transactions on Pattern Analysis and Machine Intelligence
A system for data extraction from forms of known class
ICDAR '95 Proceedings of the Third International Conference on Document Analysis and Recognition (Volume 2) - Volume 2
Document registration using projective geometry
ICDAR '95 Proceedings of the Third International Conference on Document Analysis and Recognition (Volume 2) - Volume 2
Four directional adjacency graphs (FDAG) and their application in locating fields in forms
ICDAR '95 Proceedings of the Third International Conference on Document Analysis and Recognition (Volume 2) - Volume 2
A Model-Based Form Processing Sub-System
ICPR '96 Proceedings of the International Conference on Pattern Recognition (ICPR '96) Volume III-Volume 7276 - Volume 7276
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A camera-assisted digital writing tablet was invented recently. It preserves the familiar experience of filling out a paper form while allowing automatic conversion of relevant handwritten field entries into electronic form, without explicit form scanning. In this paper, we focus on two key computer vision problems associated with the invention of this device, namely, form indexing and field projection. These are needed for accurate association of tablet writing with corresponding entries in the electronic form. Form indexing is modeled as the problem of shape-based content retrieval using the perspectively-distorted form appearances seen from the tablet camera. Fast form indexing is achieved using geometric hashing based on projective invariants. The invariants derived from curve and line features reduce the basis search space considerably while still providing for robust localization. We derive field projection as a sequence of projective transformations between the tablet, the camera and the original electronic form coordinates. Results of extensive testing on a medical form database are reported.