PDF Enhancements Tools for a Digital Library: pdfJbIm and pdfsign

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This publication doesn't include Faculty of Economics and Administration. It includes Faculty of Informatics. Official publication website can be found on muni.cz.
Authors

HATLAPATKA Radim SOJKA Petr

Year of publication 2010
Type Article in Proceedings
Conference DML 2010 Towards a Digital Mathematics Library
MU Faculty or unit

Faculty of Informatics

Citation
Web
Field Computer hardware and software
Keywords jbig2enc; JBIG2; PDF size optimization; compression; DML; digital signature; JB2; DjVu; pdfJbIm; pdfsign; DML-CZ; EuDML
Description 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.
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