[sane-devel] `Scanning' with a Digital Camera

[Jeremy]

On Tuesday 01 December 2009, Herbert Carl Meyer wrote:
> I think this is the approach google is using for google books. I read
> something a few months ago about a patent application involving a bit of
> trig to correct for tilted pages. Google it ?
> 
> Carl
> 
> On Tue, 2009-12-01 at 14:21 -0600, brian at amason.net wrote:
> > I don't see why you couldn't import the pictures into your scanning
> > application and manipulate them that way. The previous suggestion to use
> > Gimp to clean them up first is an excellent idea. Also, if you are
> > planning on making this a long term solution, you might want to make a
> > frame to hold your item to be scanned and a mount for the camera, along
> > with a good white light source to completely illuminate the subject
> > matter.
> >
> > Something that could be done for a few bucks, pick up a big cheap framed
> > picture from a swap meet or thrift store, get an old piece of plywood (or
> > a new one, a pair of hinges, a pair of sticks screwed together at 90
> > degrees, a pair of brackets, and some velcro straps for the camera.
> > Voila, improv scanner stand!
> >
> >        ___=======
> >       [___]    []
> >                []
> >      /         []
> >     /          []
> >    /           []
> >   /            []
> >  .             []
> > ===================
> >
> >
> > Definitely has a bit of a maker type of thing, and it'd be cheaper to
> > just buy a cheap linux friendly scanner than make the above. Of course
> > the above design could be easily improved upon with the addition of a
> > pair of worm screws and motors, and a control circuit. You could easily
> > build yourself an awesome plotter sized "scanner". hmmm...
> >
> >
> > Brian
> >
> > > Hi All,
> > >
> > > I'm thinking of using a digital camera as a scanner. Are there
> > > applications like these for linux:
> > > http://www.snapter.atiz.com/index.php
> > > http://www.topdrawerdownloads.com/download/105128
> > > http://www.scanr.com/
> > >
> > > Cheers,
> > > Mike.
> >
> > ...
> >
> > > Message: 3
> > > Date: Mon, 30 Nov 2009 22:58:30 -0500
> > > From: Sparr
> > >
> > > I use GIMP for this.? Perspective tool in reverse mode, then levels or
> > > curves.? Some script-fu to automate the process could speed it up a
> > > little if you need to do many documents.
> > >
> > > On Mon, Nov 30, 2009 at 10:51 PM, Mike B. <mb78aa at yahoo.com> wrote:
> > >> I'm thinking of using a digital camera as a scanner. Are there
> > >> applications like these for linux:
> >
> > --
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> 
I missed the start of this thread, so this may be off mark, but there are bash 
scripts for solving the linear algebra systems of equations needed to correct 
perspective distortions. Fred's ImageMagick site has a script "whiteboard"
for correcting photographs of poster boards:

http://www.fmwconcepts.com/imagemagick/whiteboard/index.php