[FFmpeg-user] fftfilt

[Michael Koch]

Am 14.10.2021 um 13:01 schrieb 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.

width / height