Computerising Natural History Card Archives
ICDAR '03 Proceedings of the Seventh International Conference on Document Analysis and Recognition - Volume 1
JPEG2000 Standard for Image Compression: Concepts, Algorithms and VLSI Architectures
JPEG2000 Standard for Image Compression: Concepts, Algorithms and VLSI Architectures
Document and Image Compression (Signal Processing and Communications)
Document and Image Compression (Signal Processing and Communications)
Compression and contents protection of images, texts and graphics for distance learning applications
ISPRA'07 Proceedings of the 6th WSEAS International Conference on Signal Processing, Robotics and Automation
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The paper presents one new approach for processing of scanned old documents. The goal is to achieve efficient archiving with high compression ratio and retained visual quality. The processing comprises image preprocessing used to establish the boundaries of the two main objects, i.e. texts and background, followed by adaptive compression for each object. The parts of the image, containing the background are then compressed with lossy compression, based on multi-layer pyramid decomposition, while the parts containing the text are processed with one-layer lossless compression. The compressed image is transformed in a new format, developed by the authors. In result of the processing the mean compression ratio is increased and the visual quality of the restored image is high.