In those PDF, the information on each character/symbol such as its character code, font type, coordinates on a page is usually embedded. Nowadays, a PDF file is commonly produced from a digital format such as a document in Microsoft Word, To make our task much clearer, we begin with discussing different types of PDF. In the conversion, various local languages can be chosen for reading out STEM contents. In the next section, we classify PDF into two categories, “E-born PDF” and “image PDF.” In this paper, we give a new tool to convert E-born PDF into text-based EPUB3 (the latest release of an open-ebook-standard EPUB), and then, into audio-embedded HTML5 with JavaScript (“ChattyBook”), so that the document content including math expressions is read out without a screen reader. A large number of the low vision or people who have lost their sight in not-younger days cannot, either.Īs a promising method to make digital STEM books in PDF accessible, here, we show a new assistive technology to convert inaccessible PDF into accessible digital books in some different-type formats. However, there are many dyslexic people in the print-disabled, who can read neither a Braille document nor texts in the In most cases, when considering PDF accessibility, target disabled people are usually assumed as the blind, and the conversion of PDF into Braille or text files with Furthermore, it should be emphasized that there are no well-established standards for an accessible STEM document including mathematical expressions in PDF. Unfortunately, most of PDF documents in the world are not accessible, and it is difficult to convert a given (inaccessible) PDF into PDF/UA automatically with a concise procedure.
, it is not necessarily easy to produce a document so as to conforms to the standard of PDF/UA. Although the PDF/UA standard is suggested as so-called “accessible PDF”
#CONVERT PDF TO EPUB 3 PORTABLE#
“Adobe Portable Document Format (PDF)” is commonly used for the exchange of STEM (science, technology, engineering and math) contents among researchers or in various educational fields.
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