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Re: [OctDev] imrotate
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From: Jeff O. <jor...@cs...> - 2005-02-19 19:55:52
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I'm not sure the bilinear option is working. imrotate(eye(13),45,"bilinear") and imrotate(eye(13),40,"bilinear") Jeff On Feb 16, 2005, at 12:48 AM, Todd Neal wrote: > On Tue, 15 Feb 2005 23:58:04 -0500, Paul Kienzle > <pki...@us...> wrote: >> I replaced the old version of imrotate with what you sent. >> >> I would appreciate a few simple test cases which do not >> rely on a human visual system to determine if the result >> is correct. >> >> I tried the following: >> >> X = rand(30); >> Y = imrotate(imrotate(X,30,'bicubic'),-30,'bicubic'); >> norm(X(17+[1:5],17+[1:5])-Y(30+[1:5],30+[1:5])) >> ans = 0.46103 >> >> Using a smoother function worked better: >> >> X = peaks(30); >> Y = imrotate(imrotate(X,30,'bicubic'),-30,'bicubic'); >> norm(X(17+[1:5],17+[1:5])-Y(30+[1:5],30+[1:5])) >> ans = 0.0036647 >> >> Anyone have any better suggestions? >> > > I was looking for a few good test cases and came across using this as > a test case: > > imrotate(eye(20),45) > > The problem is displayed here (in a smaller case to fit in an email > well): > > octave:18> imrotate(eye(13),45) > ans = > > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 1 0 0 1 0 0 0 1 0 0 1 0 0 0 1 0 0 1 > 1 0 0 1 0 0 0 1 0 0 1 0 0 0 1 0 0 1 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > > > Todd |
