On Thu, Oct 14, 2021 at 1:18 PM Michael Koch <astroelectro...@t-online.de> wrote:
> Am 14.10.2021 um 13:11 schrieb Paul B Mahol: > > On Thu, Oct 14, 2021 at 1:08 PM Michael Koch < > astroelectro...@t-online.de> > > wrote: > > > >> Am 14.10.2021 um 13:01 schrieb Paul B Mahol: > >>> On Thu, Oct 14, 2021 at 12:59 PM Michael Koch < > >> astroelectro...@t-online.de> > >>> wrote: > >>> > >>>> Am 14.10.2021 um 12:53 schrieb Paul B Mahol: > >>>>> On Thu, Oct 14, 2021 at 12:29 PM Michael Koch < > >>>> astroelectro...@t-online.de> > >>>>> wrote: > >>>>> > >>>>>> Am 14.10.2021 um 12:07 schrieb Paul B Mahol: > >>>>>>> Sorry but I'm not on windows, so I can not use your script. > >>>>>> Then try the below (slightly improved) version. It would become much > >>>>>> simpler with variables: > >>>>>> ARRAY_H = pow(2,ceil(log(ceil(W*10/9))/log(2))) > >>>>>> ARRAY_V = pow(2,ceil(log(ceil(H*10/9))/log(2))) > >>>>>> > >>>>>> The test image contains wavelengths from 4 to 8 (in the center) to > 16 > >>>>>> pixels per linepair. > >>>>>> The filter wavelength is independant of input size. You can change > the > >>>>>> size in the first command (but it must be 1:1 aspect ratio, > otherwise > >>>>>> hstack would fail) > >>>>>> > >>>>> Since when hstack fails because of different aspect ratio? > >>>> Because I first make the left half of the test image, then transpose > it > >>>> and then hstack them together > >>>> > >>>> The fftfilt examples do of course work with any aspect ratio. > >>>> > >>> I think you do not understand what aspect ratio really means. > >> width / height > >> > > Doesn't all this introduces aliasing if not using power of 2 width and > > height square dimensions? > > I'm not sure if I understand what you mean. Do you see a significant > difference if you make the input size 250x250 or 256x256? > it did for first test.png you sent > Michael > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
