imrotate - clockwise or counterclockwise ?

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Dan
Dan 2011-2-25
I observed that imrotate rotates images clockwise instead of counterclockwise, as indicated in the doc.
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Andreas Goser
Andreas Goser 2011-2-25
I have difficulties to post this as an answer - so doing a "comment".
I modified the example from the doc to see the direction more obvious:
I = fitsread('solarspectra.fts');
I = mat2gray(I);
J = imrotate(I,45,'bilinear','crop');
figure, imshow(I)
figure, imshow(J)
Figure 2 is rotated counterclockwise for me.
David Young
David Young 2011-2-25
I also find it rotates the image anticlockwise. (That's the local word for counterclockwise.)

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回答（1 个）

Dan
Dan 2011-2-25
Sorry for my remark. I plot images of matrices, and I use Ydir in a 'normal' way. So the rotation is inverted. Thank you for your posts.
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David Young
David Young 2011-2-25
Yes, but it's not your mistake: the help for imrotate should state which coordinate system it is assuming.

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