Authors:
Honey Kansal
1
;
Sudip Sanyal
2
and
Deepali Gupta
1
Affiliations:
1
IIIT-Allahabad, India
;
2
Indian Institute Of Information Technology, Allahabad, India, India
Keyword(s):
Dewarping, Deskewing, Deshadowing, Noise in scanned documents, Affine transformations.
Related
Ontology
Subjects/Areas/Topics:
Computer Vision, Visualization and Computer Graphics
;
Enhancement and Restoration
;
Illumination and Reflectance Modeling
;
Image Filtering
;
Image Formation and Preprocessing
;
Image Quality
;
Mathematical Morphology
Abstract:
An approach based on affine transformations is applied to solve the problem of dewarping of scanned text images. The technique is script independent and does not make any assumptions about the nature of the text image or the nature of warping. The attendant problems of deskewing and deshadowing are also dealt with using a vertical projection technique and filtering technique respectively. Experiments were performed on scanned text images with varying font sizes, shapes and from various scripts with varying degrees of warp, skew and shadow. The proposed method was found to give good results on all the text images, thus demonstrating the effect of the approach.