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Groups > comp.os.linux.misc > #14921
| From | Unknown <dog@gmail.com> |
|---|---|
| Newsgroups | comp.os.linux.misc |
| Subject | Re: pdf & O.C.R ? |
| Date | 2015-06-13 13:29 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <pan.2015.06.13.13.30.56@gmail.com> (permalink) |
| References | <pan.2015.05.23.07.50.46@gmail.com> <bjj73c-fim.ln1@mail.binaryfoundry.ca> <mk1sam$r2l$1@dont-email.me> |
On Tue, 26 May 2015 13:26:46 +0000, Joe Beanfish wrote: > On Sat, 23 May 2015 20:46:03 -0400, John-Paul Stewart wrote: > >> On 23/05/15 03:49 AM, Unknown wrote: >>> I'm confused and disturbed that xpdf of: >>> http://www.inf.ethz.ch/personal/wirth/ProjectOberon/PO.Computer.pdf >>> is perfect to the pixel, with maximum magnification [400%], which >>> is expected, since it's computer-font generated, whereas: >>> http://www.northernlaw.co.za/images/stories/files/actsandbills/COMPANY % >>> 20LAW%20ACT.pdf >>> shows blotchy and fibers as if it's a photo-of-a-paper-copy. >>> >>> And scanned copies of papers are apparently normal. >>> >>> BUT!! How is it that xpdf allows me to extract the text, via >>> mouse-copy from COMPANY%20LAW%20ACT.pdf ? >>> That would mean that the mouse-driver is doing O.C.R. ?! >> >> Why would you think the mouse driver is doing OCR? >> >> A PDF file can contain both text and images. It is common when >> scanning paper documents to turn them into a so-called "searchable PDF" >> that contains the scanned image of the page overlaid on top of the >> (OCRed) text. So what you see visually is the (possibly blurry) >> picture, while what the mouse is copying (and pdftotext is extracting) >> is the text that's hidden underneath. >> >> Adobe's own Acrobat software can create such "searchable PDF" files. >> I'm sure there are other tools, too. > This is TOO-MUCH!! You mean they send the original-keyed-in-pdftotextable, AND the graphical image of the crumpled-paper-version <overlaid>. What's the aim of such expensive deception? > Yeah, It's kinda interesting when your workstation's bogged down and the > pdf is big you might see the OCR text render first, then the image will > render, covering it up. Or maybe that only happens in the browser when > it's downloading and hasn't gotten to the image yet? Haven't seen it > happen in a while.
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pdf & O.C.R ? Unknown <dog@gmail.com> - 2015-05-23 07:49 +0000
Re: pdf & O.C.R ? Bob Tennent <BobT@cs.queensu.ca> - 2015-05-23 11:13 +0000
Re: pdf & O.C.R ? Unknown <dog@gmail.com> - 2015-05-27 17:11 +0000
Re: pdf & O.C.R ? John-Paul Stewart <jpstewart@sympatico.ca> - 2015-05-23 20:46 -0400
Re: pdf & O.C.R ? Joe Beanfish <joebeanfish@nospam.duh> - 2015-05-26 13:26 +0000
Re: pdf & O.C.R ? Unknown <dog@gmail.com> - 2015-06-13 13:29 +0000
Re: pdf & O.C.R ? Robert Heller <heller@deepsoft.com> - 2015-06-13 12:52 -0500
Re: pdf & O.C.R ? Unknown <dog@gmail.com> - 2015-05-27 17:10 +0000
Re: pdf & O.C.R ? John-Paul Stewart <jpstewart@sympatico.ca> - 2015-05-29 20:31 -0400
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