Lossless and lossy compression of text images by soft pattern matching
DCC '96 Proceedings of the Conference on Data Compression
A Codebook Generation Algorithm for Document Image Compression
DCC '97 Proceedings of the Conference on Data Compression
A Means for Achieving a High Degree of Compaction on Scan-Digitized Printed Text
IEEE Transactions on Computers
IEEE Transactions on Circuits and Systems for Video Technology
New public-key authentication watermarking for JBIG2 resistant to parity attacks
IWDW'05 Proceedings of the 4th international conference on Digital Watermarking
| Hi-index | 0.00 |
The JBIG2 standard for lossy and lossless bi-level image coding is a very flexible encoding strategy based on pattern matching techniques; The encoder collects a set of symbols in a dictionary and encodes a page by reference to the dictionary symbols. JBIG2 allows the encoder to view all symbols and choose a good set for the dictionary.We propose a two-pass technique for choosing the dictionary entries, and discuss the trade-offs in bit allocation that these choices entail. The proposed dictionary design technique outperforms simpler dictionary formation techniques by up to 7-9% and 10-18% for lossless and lossy compression, respectively. In the lossy case, we further point out one way to significantly speed up the symbol bitmap compression procedure.