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. /* 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".
