On Aug 28, 10:32 pm, chauhan.pandur...@gmail.com wrote:
> On Aug 28, 8:10 am, Jerry Avins <j...@ieee.org> wrote:
>
>
>
> > chauhan.pandur...@gmail.com wrote:
> > > On Aug 27, 12:30 pm, dbd <d...@ieee.org> wrote:
> > >> On Aug 26, 11:29 pm, chauhan.pandur...@gmail.com wrote:
>
> > >>> Hi..All,
> > >>> I have started to work on Image processing. I have used Cross-
> > >>> correlation to find the match between two images. Now, I want to
> > >>> remove barrel distortion from the sample image. But I don't know the
> > >>> algorithm to remove barrel distortion.
> > >>> Does any one have any idea of the same ?
> > >>> Thanks in advance..
> > >> Google is your friend.
>
> > >> Try: barrel distortion correction
> > >> and skip over the responses about software products to get:http://mi=
> > >> and more.
>
> > >> Dale B. Dalrymplehttp://dbdimages.com
>
> > > I have read the pdf. It is nice.
> > > Thanks ...again.
> > > Do u have another method that is for Barrel distortion ?
>
> > Perhaps my frustration in another thread has shortened my temper. Do you
> > even know what barrel distortion is? It seems to me that if you
> > understood it you would have less difficulty dealing with it, and
> > wouldn't likely have asked for *THE* algorithm to correct it.
>
> > Instead of making you guess, I'll tell you. Barrel distortion is a
> > decrease of an image's magnification as a function of radial distance
> > from the optical axis. For modest amounts, straight lines bare imaged as
> > parabolas. Correcting it amounts to measuring features that will allow
> > you to deduce magnification function, then applying a geometric
> > transformation to correct it. I don't know about you, but I can code
> > well enough so that hunting for somebody else's "THE algorithm" that
> > might do more or less what I want would probably take me more time than
> > writing it from first principles. Of course, the hard part would be
> > characterizing the distortion, and I'd be glad to learn how somebody
> > managed that, but I'm not sure it's worth an extensive search.
>
> > A good reference for optics and the algebraic treatment of the five
> > Seidel aberrations is A.E. Conrady, "Applied Optics and optical Design
> > Part One", ISBN 0-486-67007-4, available from Dover. Be a sport and get
> > Part Two also. ISBN 0-486-67008-2, and it's $2 cheaper.
>
> > Jerry
> > --
> > Engineering is the art of making what you want from things you can get.
> > =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=
=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=
=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF- Hide=
quoted text -
>
> > - Show quoted text -
>
> Thanks clay.
> Thanks to Jerry also. Jerry, I have first read and make clear myself
> about the Barrel distortion. I know the theory of Barrel distortion.
> But I don't from where to start to remove / correct the barrel
> distortion from image using the software.
> And by algorithm, I mean that I need just guidelines for the final
> software as I don't know where to start. I don't want the software
> actually.
>
> Will u help me ? ( or anyone else ?)
> Thanks again.
Perhaps I've been too subtle. My original point was to give you a
couple of example searches that could give you a lot of responses. I
merely gave two examples of searches and a single, perhaps relevant
result from each. Only you can decide if any search result is really
useful to you. Each search also yields many more results if you take
the time to look at them. And if you want something a little
different, modify the search terms and try again. Don't expect useful
results to fall only on the first page of Google results. If you can
use comp.dsp you ought to be capable of using Google.
Dale B. Dalrymple
http://dbdimages.com
Reply by ●August 29, 20072007-08-29
On Aug 28, 8:10 am, Jerry Avins <j...@ieee.org> wrote:
> chauhan.pandur...@gmail.com wrote:
> > On Aug 27, 12:30 pm, dbd <d...@ieee.org> wrote:
> >> On Aug 26, 11:29 pm, chauhan.pandur...@gmail.com wrote:
>
> >>> Hi..All,
> >>> I have started to work on Image processing. I have used Cross-
> >>> correlation to find the match between two images. Now, I want to
> >>> remove barrel distortion from the sample image. But I don't know the
> >>> algorithm to remove barrel distortion.
> >>> Does any one have any idea of the same ?
> >>> Thanks in advance..
> >> Google is your friend.
>
> >> Try: barrel distortion correction
> >> and skip over the responses about software products to get:http://mi3.=
> >> and more.
>
> >> Dale B. Dalrymplehttp://dbdimages.com
>
> > I have read the pdf. It is nice.
> > Thanks ...again.
> > Do u have another method that is for Barrel distortion ?
>
> Perhaps my frustration in another thread has shortened my temper. Do you
> even know what barrel distortion is? It seems to me that if you
> understood it you would have less difficulty dealing with it, and
> wouldn't likely have asked for *THE* algorithm to correct it.
>
> Instead of making you guess, I'll tell you. Barrel distortion is a
> decrease of an image's magnification as a function of radial distance
> from the optical axis. For modest amounts, straight lines bare imaged as
> parabolas. Correcting it amounts to measuring features that will allow
> you to deduce magnification function, then applying a geometric
> transformation to correct it. I don't know about you, but I can code
> well enough so that hunting for somebody else's "THE algorithm" that
> might do more or less what I want would probably take me more time than
> writing it from first principles. Of course, the hard part would be
> characterizing the distortion, and I'd be glad to learn how somebody
> managed that, but I'm not sure it's worth an extensive search.
>
> A good reference for optics and the algebraic treatment of the five
> Seidel aberrations is A.E. Conrady, "Applied Optics and optical Design
> Part One", ISBN 0-486-67007-4, available from Dover. Be a sport and get
> Part Two also. ISBN 0-486-67008-2, and it's $2 cheaper.
>
> Jerry
> --
> Engineering is the art of making what you want from things you can get.
> =AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=
=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=
=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF=AF- Hide qu=
oted text -
>
> - Show quoted text -
Thanks clay.
Thanks to Jerry also. Jerry, I have first read and make clear myself
about the Barrel distortion. I know the theory of Barrel distortion.
But I don't from where to start to remove / correct the barrel
distortion from image using the software.
And by algorithm, I mean that I need just guidelines for the final
software as I don't know where to start. I don't want the software
actually.
Will u help me ? ( or anyone else ?)
Thanks again.
Reply by Jerry Avins●August 28, 20072007-08-28
chauhan.pandurang@gmail.com wrote:
> On Aug 27, 12:30 pm, dbd <d...@ieee.org> wrote:
>> On Aug 26, 11:29 pm, chauhan.pandur...@gmail.com wrote:
>>
>>> Hi..All,
>>> I have started to work on Image processing. I have used Cross-
>>> correlation to find the match between two images. Now, I want to
>>> remove barrel distortion from the sample image. But I don't know the
>>> algorithm to remove barrel distortion.
>>> Does any one have any idea of the same ?
>>> Thanks in advance..
>> Google is your friend.
>>
>> Try: barrel distortion correction
>> and skip over the responses about software products to get:http://mi3.shef.ac.uk/publications/DistCorrImage_G1.pdf
>> and more.
>>
>> Or try: measuring barrel distortion
>> to get:http://scien.stanford.edu/class/psych221/projects/06/ddpatil/ee362Pro...
>> and more.
>>
>> Dale B. Dalrymplehttp://dbdimages.com
>
> I have read the pdf. It is nice.
> Thanks ...again.
> Do u have another method that is for Barrel distortion ?
Perhaps my frustration in another thread has shortened my temper. Do you
even know what barrel distortion is? It seems to me that if you
understood it you would have less difficulty dealing with it, and
wouldn't likely have asked for *THE* algorithm to correct it.
Instead of making you guess, I'll tell you. Barrel distortion is a
decrease of an image's magnification as a function of radial distance
from the optical axis. For modest amounts, straight lines bare imaged as
parabolas. Correcting it amounts to measuring features that will allow
you to deduce magnification function, then applying a geometric
transformation to correct it. I don't know about you, but I can code
well enough so that hunting for somebody else's "THE algorithm" that
might do more or less what I want would probably take me more time than
writing it from first principles. Of course, the hard part would be
characterizing the distortion, and I'd be glad to learn how somebody
managed that, but I'm not sure it's worth an extensive search.
A good reference for optics and the algebraic treatment of the five
Seidel aberrations is A.E. Conrady, "Applied Optics and optical Design
Part One", ISBN 0-486-67007-4, available from Dover. Be a sport and get
Part Two also. ISBN 0-486-67008-2, and it's $2 cheaper.
Jerry
--
Engineering is the art of making what you want from things you can get.
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Reply by Clay●August 27, 20072007-08-27
On Aug 27, 2:29 am, chauhan.pandur...@gmail.com wrote:
> Hi..All,
>
> I have started to work on Image processing. I have used Cross-
> correlation to find the match between two images. Now, I want to
> remove barrel distortion from the sample image. But I don't know the
> algorithm to remove barrel distortion.
>
> Does any one have any idea of the same ?
>
> Thanks in advance..
Besides, what Dale offered, try googleing for "Panorama Tools" by
Dersch. I know he used to offer the source code for free. With his
stuff, you could actually apply 3 different corrections (one for each
color channel) and pretty well correct chromatic aberation in addition
to correcting barrel/pincushion distortion. You will find some ultra
wide zooms actually have a moustache distortion. But these are well
handled by a radial mapping function. They just take a lot of effort
to characterize.
Clay
Reply by ●August 27, 20072007-08-27
On Aug 27, 12:30 pm, dbd <d...@ieee.org> wrote:
> On Aug 26, 11:29 pm, chauhan.pandur...@gmail.com wrote:
>
> > Hi..All,
>
> > I have started to work on Image processing. I have used Cross-
> > correlation to find the match between two images. Now, I want to
> > remove barrel distortion from the sample image. But I don't know the
> > algorithm to remove barrel distortion.
>
> > Does any one have any idea of the same ?
>
> > Thanks in advance..
>
> Google is your friend.
>
> Try: barrel distortion correction
> and skip over the responses about software products to get:http://mi3.shef.ac.uk/publications/DistCorrImage_G1.pdf
> and more.
>
> Or try: measuring barrel distortion
> to get:http://scien.stanford.edu/class/psych221/projects/06/ddpatil/ee362Pro...
> and more.
>
> Dale B. Dalrymplehttp://dbdimages.com
I have read the pdf. It is nice.
Thanks ...again.
Do u have another method that is for Barrel distortion ?
Reply by ●August 27, 20072007-08-27
On Aug 27, 12:30 pm, dbd <d...@ieee.org> wrote:
> On Aug 26, 11:29 pm, chauhan.pandur...@gmail.com wrote:
>
> > Hi..All,
>
> > I have started to work on Image processing. I have used Cross-
> > correlation to find the match between two images. Now, I want to
> > remove barrel distortion from the sample image. But I don't know the
> > algorithm to remove barrel distortion.
>
> > Does any one have any idea of the same ?
>
> > Thanks in advance..
>
> Google is your friend.
>
> Try: barrel distortion correction
> and skip over the responses about software products to get:http://mi3.shef.ac.uk/publications/DistCorrImage_G1.pdf
> and more.
>
> Or try: measuring barrel distortion
> to get:http://scien.stanford.edu/class/psych221/projects/06/ddpatil/ee362Pro...
> and more.
>
> Dale B. Dalrymplehttp://dbdimages.com
Hi...Dale,
Thanks for your link.
Reply by dbd●August 27, 20072007-08-27
On Aug 26, 11:29 pm, chauhan.pandur...@gmail.com wrote:
> Hi..All,
>
> I have started to work on Image processing. I have used Cross-
> correlation to find the match between two images. Now, I want to
> remove barrel distortion from the sample image. But I don't know the
> algorithm to remove barrel distortion.
>
> Does any one have any idea of the same ?
>
> Thanks in advance..
Hi..All,
I have started to work on Image processing. I have used Cross-
correlation to find the match between two images. Now, I want to
remove barrel distortion from the sample image. But I don't know the
algorithm to remove barrel distortion.
Does any one have any idea of the same ?
Thanks in advance..