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Re: A serious challenge for Feeb

From "F. Russell" <fr@random.info>
Newsgroups comp.os.linux.advocacy
Subject Re: A serious challenge for Feeb
Date 2019-02-12 22:40 +0000
Organization NewsGuy.com
Message-ID <q3vi100lgr@news2.newsguy.com> (permalink)
References <ODo8E.2652$rE6.1616@fx12.iad> <sandman-4971778a79c5ffd059f113fa7d786f83@individual.net> <WMA8E.10920$ht.8685@fx36.iad>

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On Tue, 12 Feb 2019 09:30:51 -0500, DFS wrote:

> 
> Thanks, but everyone keeps missing the 'clean stray marks' part.
> 
> That's those little clumps of black pixels all over the page.
>

Ordinarily, one would use a median filer to remove such "outliers"
but in this case, the "noise" has the same characteristics as the
signal.

The very best that can be done simply and programmatically is
to use the ImageMagick morphology operator with an appropriate
kernel:

convert -morphology Dilate Diamond:1 input-image output-image
 
This will ALMOST eliminate the stray marks but it will degrade
the content as well.

It is certainly possible to develop a method to remove only those
stray marks but the effort would not be worth it.  It would involve,
for example, setting up a neural network to recognize isolated pixels
and then fill those with the background.

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Thread

A serious challenge for Feeb DFS <nospam@dfs.com> - 2019-02-11 19:42 -0500
  Re: A serious challenge for Feeb Steve Carroll <fretwizzer@gmail.com> - 2019-02-11 16:53 -0800
    Re: A serious challenge for Feeb Steve Carroll <fretwizzer@gmail.com> - 2019-02-11 16:57 -0800
      Re: A serious challenge for Feeb DFS <nospam@dfs.com> - 2019-02-11 20:11 -0500
        Re: A serious challenge for Feeb Steve Carroll <fretwizzer@gmail.com> - 2019-02-11 17:23 -0800
          Re: A serious challenge for Feeb DFS <nospam@dfs.com> - 2019-02-11 20:39 -0500
            Re: A serious challenge for Feeb Steve Carroll <fretwizzer@gmail.com> - 2019-02-11 17:45 -0800
              Re: A serious challenge for Feeb DFS <nospam@dfs.com> - 2019-02-11 22:19 -0500
                Re: A serious challenge for Feeb Steve Carroll <fretwizzer@gmail.com> - 2019-02-11 19:50 -0800
                Re: A serious challenge for Feeb DFS <nospam@dfs.com> - 2019-02-11 23:10 -0500
                Re: A serious challenge for Feeb owl <owl@rooftop.invalid> - 2019-02-12 04:22 +0000
                Re: A serious challenge for Feeb Steve Carroll <fretwizzer@gmail.com> - 2019-02-11 20:32 -0800
                Re: A serious challenge for Feeb Steve Carroll <fretwizzer@gmail.com> - 2019-02-11 20:42 -0800
                Re: A serious challenge for Feeb Snit <usenet@gallopinginsanity.com> - 2019-02-12 05:40 +0000
                Re: A serious challenge for Feeb DFS <nospam@dfs.com> - 2019-02-12 10:40 -0500
                Re: A serious challenge for Feeb owl <owl@rooftop.invalid> - 2019-02-12 16:39 +0000
                Re: A serious challenge for Feeb DFS <nospam@dfs.com> - 2019-02-12 13:43 -0500
                Re: A serious challenge for Feeb owl <owl@rooftop.invalid> - 2019-02-12 20:18 +0000
                Re: A serious challenge for Feeb DFS <nospam@dfs.com> - 2019-02-12 19:58 -0500
                Re: A serious challenge for Feeb Steve Carroll <fretwizzer@gmail.com> - 2019-02-13 06:48 -0800
                Re: A serious challenge for Feeb "F. Russell" <frussell@random.info> - 2019-02-13 15:10 +0000
                Re: A serious challenge for Feeb Steve Carroll <fretwizzer@gmail.com> - 2019-02-13 08:02 -0800
                Re: A serious challenge for Feeb Ratchetjaw <ratchetjaw@mail.com> - 2019-02-13 16:28 +0000
                Re: A serious challenge for Feeb Steve Carroll <fretwizzer@gmail.com> - 2019-02-13 09:29 -0800
                Re: A serious challenge for Feeb owl <owl@rooftop.invalid> - 2019-02-12 04:03 +0000
                Re: A serious challenge for Feeb DFS <nospam@dfs.com> - 2019-02-12 10:56 -0500
                Re: A serious challenge for Feeb DFS <nospam@dfs.com> - 2019-02-12 10:58 -0500
                Re: A serious challenge for Feeb Steve Carroll <fretwizzer@gmail.com> - 2019-02-12 07:59 -0800
                Re: A serious challenge for Feeb owl <owl@rooftop.invalid> - 2019-02-12 16:37 +0000
                Re: A serious challenge for Feeb Steve Carroll <fretwizzer@gmail.com> - 2019-02-12 08:42 -0800
                Re: A serious challenge for Feeb owl <owl@rooftop.invalid> - 2019-02-12 17:09 +0000
  Re: A serious challenge for Feeb "F. Russell" <fr@random.info> - 2019-02-12 01:27 +0000
  Re: A serious challenge for Feeb owl <owl@rooftop.invalid> - 2019-02-12 02:04 +0000
    Re: A serious challenge for Feeb DFS <nospam@dfs.com> - 2019-02-11 21:11 -0500
      Re: A serious challenge for Feeb owl <owl@rooftop.invalid> - 2019-02-12 02:19 +0000
        Re: A serious challenge for Feeb DFS <nospam@dfs.com> - 2019-02-12 09:36 -0500
  Re: A serious challenge for Feeb Sandman <mr@sandman.net> - 2019-02-12 09:54 +0000
    Re: A serious challenge for Feeb DFS <nospam@dfs.com> - 2019-02-12 09:30 -0500
      Re: Re: A serious challenge for Feeb Sandman <mr@sandman.net> - 2019-02-12 15:24 +0000
      Re: A serious challenge for Feeb "F. Russell" <fr@random.info> - 2019-02-12 22:40 +0000
        Re: A serious challenge for Feeb Ratchetjaw <ratchetjaw@mail.com> - 2019-02-12 23:07 +0000
        Re: A serious challenge for Feeb DFS <nospam@dfs.com> - 2019-02-12 19:53 -0500
          Re: A serious challenge for Feeb "F. Russell" <frussell@random.info> - 2019-02-13 18:15 +0000
    Re: A serious challenge for Feeb Steve Carroll <fretwizzer@gmail.com> - 2019-02-12 07:21 -0800

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