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Perspective transform revisited
#27
(12-03-2020, 03:28 PM)Ottia Tuota Wrote: ...
(By the way, you had a neat trick to find the center!)
...

But on a second thought, that trick gives only the center of the ellipse (= the distorted circle). What the plugin needs, is the would-be center, meaning the point which should be sent to the center of the corrected circle. In this picture it seems to be the same thing! That is a matter of luck, and probably is due to the method with which the picture was produced to begin with. I guess that it was made from some original picture (containing a true circle) by an affine transformation (scale? shear? ...)? So, the trick does not work generally.
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Messages In This Thread
Perspective transform revisited - by Ottia Tuota - 10-28-2020, 05:11 PM
RE: Perspective transform revisited - by Krikor - 10-28-2020, 07:04 PM
RE: Perspective transform revisited - by denzjos - 10-29-2020, 05:15 PM
RE: Perspective transform revisited - by Blighty - 11-03-2020, 11:16 AM
RE: Perspective transform revisited - by Krikor - 11-03-2020, 02:12 PM
RE: Perspective transform revisited - by denzjos - 11-05-2020, 04:40 PM
RE: Perspective transform revisited - by Krikor - 11-05-2020, 06:04 PM
RE: Perspective transform revisited - by denzjos - 11-06-2020, 09:10 AM
RE: Perspective transform revisited - by Krikor - 11-10-2020, 09:04 PM
RE: Perspective transform revisited - by Krikor - 11-11-2020, 12:50 PM
RE: Perspective transform revisited - by akovia - 11-16-2020, 06:11 PM
RE: Perspective transform revisited - by Krikor - 12-01-2020, 12:45 PM
RE: Perspective transform revisited - by denzjos - 12-03-2020, 02:17 PM
RE: Perspective transform revisited - by Ottia Tuota - 12-03-2020, 04:56 PM
RE: Perspective transform revisited - by denzjos - 12-03-2020, 05:42 PM
RE: Perspective transform revisited - by denzjos - 12-04-2020, 08:58 AM
RE: Perspective transform revisited - by Krikor - 12-05-2020, 07:06 PM
RE: Perspective transform revisited - by denzjos - 12-06-2020, 12:02 PM

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