On 13/07/12 16:09, Calculemus wrote:

I need to implement motion blur(linear, radial and zoom )algorithms for an app I work on, like yours in GIMP.

Hi
Is your application free software?
Please keep in mind that if you plan to publish your application and you re-use code from GIMP you have to honor the GPL V3 license, publishing the source code along the distributed binaries.

Releasing source code isn't a requirement if you don't plan to distribute the application to the public and keep it for yourself.

Kind regards, Gez.

On Fri, Jul 13, 2012 at 11:09 PM, Calculemus wrote:

I need to implement motion blur(linear, radial and zoom )algorithms for an app I work on, like yours in GIMP.

In the .c file for motion blur it is not stated which source is used for the math/algorithm.

Someone knows the source, paper, book or whatever that was used as reference for implementing the motion blur algorithms?

Why do you necessarily want the algo from GIMP?

There are probably dozens of approaches. Finding a paper is not a problem :)

http://graphics.snu.ac.kr/publications/conference_proceedings/2007-dykim-egwnp.pdf + its references could be a start.

Alexandre Prokoudine http://libregraphicsworld.org

On 07/13/12 21:09, Calculemus wrote:

I need to implement motion blur(linear, radial and zoom )algorithms for an app I work on, like yours in GIMP.

In the .c file for motion blur it is not stated which source is used for the math/algorithm.

Someone knows the source, paper, book or whatever that was used as reference for implementing the motion blur algorithms?

Thanks

Motion blur is convolution of the image with a straight line ; defocus blur with a filled circle. Deblurring is done by the inverse operation, deconvolution.

This can be done as multiplication in the freq domain using FFT or convolution with a simple kernel image.

/gg

On Fri, Jul 13, 2012 at 5:36 PM, Calculemus wrote:

Alexandre, but that paper is for motion blur for animation sequences. I just need motion blur for 2D images. It has two parameters, angle and displacement.

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Hi,

I would think Wikipedia would be perfect for a student to start their research? :)

I just typed "motion blur algorithm" within en.wikipedia.org and got hundreds of hits.

Hope that helps.

Partha

Hi Calcemus,

Easy to find papers, hmm? Ok, I am a student and need your advice on this. Let's say I want to find a paper on an algorithm which I know what it does, and that is all. Where do I search? I am member at acm.org but usually they have very advanced papers.

nearly every scientific paper starts with a survey on existing papers and research.
You could also look at Google scholar for survey or introduction papers. Another way is to use www.metager.de (a meta search engine) and select some scientific search engines there. This should give you some hints or serve as starting point into a particular topic.

Best regards,

grafxuser

May I ask why you are not simply using GEGL as the backend for you application? It implements a large number of image processing operations (every one you've asked about so far) and is designed to be reusable.

If there are issues which prevent you from using it we would love to hear about it so we can improve the situation.

On 13/07/2012, Calculemus wrote:

Nope I am far from releasing :)

Why GIMP? It is the only open source for this kinda thing I know.

Easy to find papers, hmm? Ok, I am a student and need your advice on this. Let's say I want to find a paper on an algorithm which I know what it does, and that is all. Where do I search? I am member at acm.org but usually they have very advanced papers.