Computer Vision, Graphics, and Image Processing
Digital image processing: principles and applications
Digital image processing: principles and applications
Computer Processing of Line-Drawing Images
ACM Computing Surveys (CSUR)
Use of the Hough transformation to detect lines and curves in pictures
Communications of the ACM
Radon Transform for Lineal Symbol Representation
ICDAR '03 Proceedings of the Seventh International Conference on Document Analysis and Recognition - Volume 1
Digital Image Processing Using MATLAB
Digital Image Processing Using MATLAB
Automatic Extraction of Data from 2-D Plots in Documents
ICDAR '07 Proceedings of the Ninth International Conference on Document Analysis and Recognition - Volume 01
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Data Rescue is the ongoing process of preserving all data at risk of being lost due to deterioration of the medium and digitizing current and past data into computer compatible form for easy access. IMD has conscientiously taken observations of the weather, recorded them either manually or automatically, transcribed them onto preset paper forms called autographic charts. Most of the charts are now at risk of being lost due to rapid deterioration of the medium. This paper presents algorithms for automatic extraction and storage of the atmospheric data using image processing tools. The key factors that influence the methods are speed, accuracy and space. We have tested the algorithms on scanned images of the autographic charts available at IMD and present the results in this paper.