On 7/17/20, Steinar H. Gunderson <steinar+ffm...@gunderson.no> wrote: > On Fri, Jul 17, 2020 at 08:00:31PM +0200, Paul B Mahol wrote: >>>> But crucial info is missing. How one build vectors? >>> (point - center) * scale_factor + center >> And how to pick scale_factor, > > It's a user parameter. scale_factor signifies how long the blur is. > 1.0 is no blur, 2.0 means every point gets blurred out to twice the distance > from the center. > >> more over how to make this recursive at all? > > It's only recursive in the formulation; the actual computation is iterative. > > tmp_pic1 = blur_pass(orig_pic, scale_factor); > tmp_pic2 = blur_pass(tmp_pic1, (scale_factor - 1.0) / 2.0 + 1.0); > tmp_pic3 = blur_pass(tmp_pic2, (scale_factor - 1.0) / 4.0 + 1.0); > output_pic = blur_pass(tmp_pic3, (scale_factor - 1.0) / 8.0 + 1.0); > > Repeat as many times as desired until you get the quality you want. > > You can also be creative with the blend strength if you want a blur that's > not a box blur.
I fail to see how this can be faster than current approach at same quality. > > /* Steinar */ > -- > Homepage: https://www.sesse.net/ > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
