Re: Downscaling algorithms

From: stefan (stefan_at_[hidden])
Date: 2019-05-27 13:07:25

Hi Olzhas,

On 2019-05-27 7:54 a.m., Olzhas Zhumabek wrote:
> Hi,
>
> For my GSoC project, I need a downscaling algorithm for ORB feature 
> detection, preferably of a good quality. Is there any in GIL already 
> (quick glance didn't reveal anything)? If not, I would like to 
> implement Lanczos resampling 
> <https://en.wikipedia.org/wiki/Lanczos_resampling>, which from what I 
> read is a good algorithm for scaling down. ORB also needs only 
> multiples of two downscaling, so I don't have any exquisite requirements.
>
> There is a public domain implementation, imageresampler 
> <https://github.com/rwohleb/imageresampler>. I was thinking about 
> incorporating it into GIL. I believe it shouldn't take too much time.
>
> What do you think?

That's a good idea. And as this is a well-defined, self-contained task, 
I would suggest to do that work on a feature branch of its own, and as 
soon as it's complete (including tests and perhaps even benchmarks), 
submit a PR to the `develop` branch of the master repo.

Please also discuss with Miral & Mateusz as there are many more IP 
algorithms that will be added over the next couple of months, and it 
would be good to share a common directory structure as well as build & 
test logic.

Let's discuss details on gitter.

Thanks,

Stefan

--
       ...ich hab' noch einen Koffer in Berlin...