Well, I don't actually need the text, I just need to know if it is text.
The idea is that once I separate them, all the ones that are images can
then be ocr corrected to text versions.
So my idea was either a yes/no answer or to say something like, if the
document is more than 20%(arbitrary) text consider it text.
PDF is a scripting language. You can look at the raw PDF with a text
editor and you'll see plain text PDF operators interspersed with
possibly binary data. In principle PDF is a programming language and the
only way to tell what it produces is to run it. But in practice, PDF
code is all machine-written, and you could probably learn to distinguish
font-using PDFs from pure-image PDFs by examining the raw PDF file.
You could look for the font embedding operators. A document consisting
only of scanned page images probably won't have any fonts embedded in
it. Or, if the scanned-paper PDFs are all made by a particular program,
you might be able to identify particular PDF operator sequences that it
uses.
_______________________________________________
vox-tech mailing list
[email protected]
http://lists.lugod.org/mailman/listinfo/vox-tech
