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

[Steinar H. Gunderson]

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 :-)

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