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[Octave-bug-tracker] [bug #44830] image package: imtransform gives diffe
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From: |
Pantxo Diribarne |
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Subject: |
[Octave-bug-tracker] [bug #44830] image package: imtransform gives different numbers on simple rotation |
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Date: |
Tue, 14 Apr 2015 10:43:56 +0000 |
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User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:37.0) Gecko/20100101 Firefox/37.0 |
Follow-up Comment #1, bug #44830 (project octave):
The third column in the transform matrix is unused for 'affine' transforms.
Does simplifying the call as follows change Matlab result:
clear;
pkg load image;
M = [0 1 0; 0 1 0; 0 1 0];
a=45;
t = maketform ('affine',[cosd(a) sind(a); -sind(a) cosd(a); 0 0]);
imtrans = imtransform (M,t,'fillvalues',0)
Also what should we think about the fact that Matlab output is not symmetric?
I expect (may be wrong though) symmetries around both diagonals for such
rotation of 45°.
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