pdf & O.C.R ?

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From	Unknown <dog@gmail.com>
Newsgroups	comp.os.linux.misc
Subject	pdf & O.C.R ?
Date	Sat, 23 May 2015 07:49:37 +0000 (UTC)
Organization	A noiseless patient Spider
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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.   ?!
And mc's viewer [which uses <pdftotext> ] reads this text.

Is this some new O.C.R. which I could use on jpg-ed pages of text?

==Thanks for any answers.

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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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