[FFmpeg-devel] [PATCH] avfilter: add radial and circular blur video filter

[Paul B Mahol]

On 7/17/20, Steinar H. Gunderson <steinar+ffmpeg at gunderson.no> wrote:
> On Fri, Jul 17, 2020 at 02:24:44PM +0200, Paul B Mahol wrote:
>>> Do you have any benchmarks on this? Or image samples? It looks like you
>>> are
>>> transforming to polar coordinates, doing a box blur and then transforming
>>> back... how does this compare speed- and quality-wise to the more common
>>> recursive scale+blend approach (which needs no trig)?
>> Can you provide more info about such algorithm?
>
> There are some pointers in this thread:
>
>   https://www.pouet.net/topic.php?which=4964&page=1#c184918
>
> I guess this is the oldest description that I know of:
>
>
> http://web.archive.org/web/20040905085427/http://www.themirror.nl/~plek/hypnoglow.txt
>
> For a more IIR-like approach, there's this:
>
>
> https://web.archive.org/web/20010606232509/http://www.demo-scene.dk:80/tutorials/radialblur.html
>
> Note that the latter is so old that it predates widespread MMX :-)
>

I already encountered last one.
But crucial info is missing. How one build vectors? And what about
circular blur?

> /* Steinar */
> --
> Homepage: https://www.sesse.net/
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