On Wed, Nov 5, 2014 at 7:50 PM, Ravi Ojha wrote:

Hello Devs

I'm trying to understand the implementation of several Image Interpolation techniques of GEGL. For instance, Cubic.

I spent some time with the code but it gets a little tougher to keep the strings together. I was wondering if there are any blog posts explaining the implementation process of Cubic, NoHalo and LoHalo algorithms.

I think you could start from
http://web.cs.laurentian.ca/nrobidoux/misc/NohaloAndLohalo.txt.

There are also *a lot* of comments in e.g. https://github.com/GNOME/gegl/blob/master/gegl/buffer/gegl-sampler-nohalo.c

Alex

Ravi:

The other thing you should know is that sigmoidization http://www.imagemagick.org/Usage/resize/#resize_sigmoidal should be ripped out of the LoHalo code: One can do better than to enlarge through linear light when the filter has negative lobes, but I ascertained last Summer that sigmoidization is not the way to do it.

On 5 November 2014 16:50, Ravi Ojha wrote:

Hello Devs

I'm trying to understand the implementation of several Image Interpolation techniques of GEGL. For instance, Cubic.

I spent some time with the code but it gets a little tougher to keep the strings together. I was wondering if there are any blog posts explaining the implementation process of Cubic, NoHalo and LoHalo algorithms.

Thanks

Ravi Ojha B. Tech. Computer Engineering
NIT Surat
http://www.hck.re/akatsuki | http://www.rookieslab.com

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