Am 14.10.2021 um 13:23 schrieb Paul B Mahol:
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
The first version was with square waves. It's better to test with the
last version which uses sine waves and the wavelength changes continuously.
Michael
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