It’s called a sinusoidal grating because the grayscale values vary according to the sine function.
If you plot the values along a horizontal line of the grating, you’ll get a plot of a sine function
Sinusoidal gratings can have different orientations…
…and different frequencies—these are spatial frequencies, not temporal ones
There's one more parameter that defines a sinusoidal grating: the phase. Gratings with a different phase are shifted with respect to each other…
@peterdrake I have been doing this (on Twitter) for a few months now, but this is an old post (from Twitter, recycled here) so the images didn’t have them. I now autogenerate these snippets which makes adding the code in ALT text easy
QOTO: Question Others to Teach Ourselves
An inclusive, Academic Freedom, instance
All cultures welcome.
Hate speech and harassment strictly forbidden.