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Fix translation bug in image rotate

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Johannes Schönberger
2012-08-27 13:31:34 +02:00
parent 00e1d14294
commit c0538c03e9
1 changed files with 4 additions and 4 deletions
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skimage/transform/_warps.py
+4 -4
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@@ -248,7 +248,7 @@ def rotate(image, angle, preserve_shape=False, order=1,
rows, cols = image.shape[0], image.shape[1]
# rotation around center
translation = np.floor(np.array((cols, rows )) / 2.)
translation = np.array((cols, rows)) / 2. - 0.5
tform1 = SimilarityTransform(translation=-translation)
tform2 = SimilarityTransform(rotation=np.deg2rad(angle))
tform3 = SimilarityTransform(translation=translation)
@@ -257,15 +257,15 @@ def rotate(image, angle, preserve_shape=False, order=1,
output_shape = None
if not preserve_shape:
# determine shape of output image
corners = np.array([[1, 1], [1, rows], [cols, 1], [cols, rows]])
corners = tform2(tform1(corners - 1))
corners = np.array([[1, 1], [1, rows], [cols, rows], [cols, 1]])
corners = tform(corners - 1)
minc = corners[:, 0].min()
minr = corners[:, 1].min()
maxc = corners[:, 0].max()
maxr = corners[:, 1].max()
out_rows = maxr - minr + 1
out_cols = maxc - minc + 1
output_shape = (out_rows, out_cols)
output_shape = np.ceil((out_rows, out_cols))
# fit output image in new shape
translation = ((cols - out_cols) / 2., (rows - out_rows) / 2.)