[FFmpeg-user] fftfilt

[Paul B Mahol]

On Thu, Oct 14, 2021 at 12:59 PM Michael Koch <astroelectronic at 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 <
> astroelectronic at 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.


>
> Michael
>
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