Structural Compression Of Document Images With PDF/A

This paper describes a new compression algorithm of document images based on separating the text layer from the graphics one on the initial image and compression of each layer by the most suitable common algorithm. Then compressed layers are placed into PDF/A, a standardizated file format for long-term archiving of electronic documents. Using the individual separation algorithm for each type of document makes it possible to save the image to the best advantage. Moreover, the text layer can be processed by an OCR system and the recognized text can also be placed into the same PDF/A file for making it easy to perform cut and paste and text search operations.