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Clip Raster Image Pair by Overlapping Area using Python

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  Clip Raster Image Pair by Overlapping Area using Python mikejohnryan08@gmail.com - 2014-05-19 18:05 -0700
    Re: Clip Raster Image Pair by Overlapping Area using Python Chris Angelico <rosuav@gmail.com> - 2014-05-20 11:17 +1000
      Re: Clip Raster Image Pair by Overlapping Area using Python mikejohnryan08@gmail.com - 2014-05-19 18:30 -0700
        Re: Clip Raster Image Pair by Overlapping Area using Python Chris Angelico <rosuav@gmail.com> - 2014-05-20 11:43 +1000
          Re: Clip Raster Image Pair by Overlapping Area using Python Rustom Mody <rustompmody@gmail.com> - 2014-05-19 21:22 -0700

#71780 — Clip Raster Image Pair by Overlapping Area using Python

Hello,

I have a set of aerial images which I am trying to clip by their overlapping areas, for use in a more involved program I am writing with PIL.

What would be the best method with Python to extract the overlapping area from a pair of images?  I know there are libraries out there that could do this, but I couldn't find any so far.

I need to execute this through Python as it will be part of a batch processing script.  Any ideas/advice would be great!  Thanks so much in advance. 

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#71781

On Tue, May 20, 2014 at 11:05 AM,  <mikejohnryan08@gmail.com> wrote:
> I have a set of aerial images which I am trying to clip by their overlapping areas, for use in a more involved program I am writing with PIL.
>
> What would be the best method with Python to extract the overlapping area from a pair of images?  I know there are libraries out there that could do this, but I couldn't find any so far.
>

The problem is that they won't absolutely perfectly match, so you need
some sort of similarity check. That's hard - very hard. I suggest you
find a stand-alone program that will do that part of the job; it'll be
easier than finding a Python library for it.

ChrisA

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#71782

On Monday, May 19, 2014 9:17:05 PM UTC-4, Chris Angelico wrote:
> On Tue, May 20, 2014 at 11:05 AM,  <mikejohnryan08@gmail.com> wrote:
> 
> > I have a set of aerial images which I am trying to clip by their overlapping areas, for use in a more involved program I am writing with PIL.
> 
> >
> 
> > What would be the best method with Python to extract the overlapping area from a pair of images?  I know there are libraries out there that could do this, but I couldn't find any so far.
> 
> >
> 
> 
> 
> The problem is that they won't absolutely perfectly match, so you need
> 
> some sort of similarity check. That's hard - very hard. I suggest you
> 
> find a stand-alone program that will do that part of the job; it'll be
> 
> easier than finding a Python library for it.
> 
> 
> 
> ChrisA


Chris,

Thanks for your response.  For my purpose, the images won't have to be 'perfectly' matched, but hopefully as close as possible.  Registration algorithms won't work for this reason--the images aren't identical to each other because of the different perspectives.

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#71783

On Tue, May 20, 2014 at 11:30 AM,  <mikejohnryan08@gmail.com> wrote:
> Thanks for your response.  For my purpose, the images won't have to be 'perfectly' matched, but hopefully as close as possible.  Registration algorithms won't work for this reason--the images aren't identical to each other because of the different perspectives.
>

Yeah, and that's what makes it hard. This is outside my area of
expertise, so all I can say is that these sorts of programs do exist,
but restricting yourself to Python libraries may make your life
unnecessarily hard.

On a separate topic, you're posting through Google Groups with its
abhorrent bugs. Can you please either edit your posts before sending
(removing the blank lines, wrapping to a sane width, and trimming the
quoted text), or switch to a better newsreader (or the mailing list)?
You'll find that a lot of people here either filter your message to
/dev/null automatically, or take one look and just move on to the next
post. Remember, never offend people with form when you can offend them
with substance :)

ChrisA

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#71787

On Tuesday, May 20, 2014 7:13:42 AM UTC+5:30, Chris Angelico wrote:

> On a separate topic, you're posting through Google Groups with its
> abhorrent bugs. Can you please either edit your posts before sending
> (removing the blank lines, wrapping to a sane width, and trimming the
> quoted text), or switch to a better newsreader (or the mailing list)?
> You'll find that a lot of people here either filter your message to
> /dev/null automatically, or take one look and just move on to the next
> post. Remember, never offend people with form when you can offend them
> with substance :)

This https://wiki.python.org/moin/GoogleGroupsPython
shows the problems and possible solutions

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