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@inproceedings{891674,
author = {Hatlapatka, Radim and Sojka, Petr},
address = {Brno, Czech Republic},
booktitle = {DML 2010 Towards a Digital Mathematics Library},
edition = {First edition},
keywords = {jbig2enc; JBIG2; PDF size optimization; compression; DML; digital signature; JB2; DjVu; pdfJbIm; pdfsign; DML-CZ; EuDML},
howpublished = {tištěná verze "print"},
language = {eng},
location = {Brno, Czech Republic},
isbn = {978-80-210-5242-0},
pages = {45-55},
publisher = {Masaryk University},
title = {PDF Enhancements Tools for a Digital Library: pdfJbIm and pdfsign},
url = {http://dml.cz/handle/10338.dmlcz/702572},
year = {2010}
}
TY - JOUR
ID - 891674
AU - Hatlapatka, Radim - Sojka, Petr
PY - 2010
TI - PDF Enhancements Tools for a Digital Library: pdfJbIm and pdfsign
PB - Masaryk University
CY - Brno, Czech Republic
SN - 9788021052420
KW - jbig2enc
KW - JBIG2
KW - PDF size optimization
KW - compression
KW - DML
KW - digital signature
KW - JB2
KW - DjVu
KW - pdfJbIm
KW - pdfsign
KW - DML-CZ
KW - EuDML
UR - http://dml.cz/handle/10338.dmlcz/702572
N2 - This paper describes several innovative PDF document enhancements and tools that can be used when building a digital library. The main result presented in this paper is the PDF re-compression tool, developed using the jbig2enc encoder called pdfJbIm. This re-compression tool enables the size of the original bitonal PDFs to be, on average, halved. Some modifications to the jbig2enc encoder that increase the compression ratio even further are also described here. Together with another program, the pdfsizeopt.py by Péter Szabó, we have managed to decrease PDF storage size to such an extent that the transmission needs of a digital library were significantly reduced. We report the storage saving results that we have achieved on The Czech Digital Mathematics Library DML-CZ. We have downsized the PDF corpus to 43% of its original size. We also describe pdfsign tools for batch digital signature stamping of PDF documents.
ER -
HATLAPATKA, Radim a Petr SOJKA. PDF Enhancements Tools for a Digital Library: pdfJbIm and pdfsign. In \textit{DML 2010 Towards a Digital Mathematics Library}. First edition. Brno, Czech Republic: Masaryk University. s.~45-55. ISBN~978-80-210-5242-0. 2010.
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