Hi Aman,

Could you post a minimal example? I've tried the following and it seems to work fine on my machine:

```python

...

...

import numpy as np im = np.random.rand(5, 5) im[0, 0] = -1 im[1, 1] = 1 from skimage import morphology as mor, filter as fil selem = mor.disk(2) med = fil.rank.median(im, selem) med

array([[220, 220, 180, 216, 166], [220, 180, 216, 200, 200], [126, 180, 171, 180, 200], [119, 126, 155, 171, 216], [104, 119, 126, 171, 171]], dtype=uint8) ```

Also, please post the version of scikit-image you're using.

But anyway, off the top of my head, no, I don't have any clear idea of what's going wrong!

Juan.

On Sat, Feb 1, 2014 at 9:15 AM, Aman Thakral aman.thakral@gmail.com wrote:

Hi all,

I'm currently trying to use a median filter on my data, an am getting an error that I can't seem to debug.

I'm taking the difference of two images (both numpy.float64), scaling them between -1 and 1, and trying to apply a median filter. My image satisfies the conditions for being between -1 and 1 when I do the following test:

print diff.min()/dmax < -1.0 -> returns False (LHS evals to -1.0) print diff.max()/dmax > 1.0 -> returns False (LHS evals to 0.663919388648)

The statement causing the error:

filtered = fltr.median(diff/dmax, selem)

where diff is my difference, and dmax is my scaling adjustment, selem is a disk of radius 2

This gives me the following traceback.

Traceback (most recent call last):

File "/home/clustering.py", line 138, in image_ratio filtered = fltr.median(diff/dmax/2.+0.5, selem, mask=m.astype(np.bool)) File "/usr/local/lib/python2.7/dist-packages/skimage/filter/rank/generic.py", line 369, in median out=out, mask=mask, shift_x=shift_x, shift_y=shift_y) File "/usr/local/lib/python2.7/dist-packages/skimage/filter/rank/generic.py", line 71, in _apply out_dtype) File "/usr/local/lib/python2.7/dist-packages/skimage/filter/rank/generic.py", line 34, in _handle_input image = img_as_ubyte(image) File "/usr/local/lib/python2.7/dist-packages/skimage/util/dtype.py", line 358, in img_as_ubyte return convert(image, np.uint8, force_copy) File "/usr/local/lib/python2.7/dist-packages/skimage/util/dtype.py", line 191, in convert raise ValueError("Images of type float must be between -1 and 1.") ValueError: Images of type float must be between -1 and 1.

Has anyone else experienced this problem before? I tried searching in the groups, but couldn't find anything relevant.

Any help would be greatly appreciated!

Thanks, Aman

-- You received this message because you are subscribed to the Google Groups "scikit-image" group. To unsubscribe from this group and stop receiving emails from it, send an email to scikit-image+unsubscribe@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.