imagestats¶
Functions for computing image statistics
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Count number of non-zero voxels |
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Compute volume of mask image. |
count_nonzero_voxels¶
- nibabel.imagestats.count_nonzero_voxels(img)¶
Count number of non-zero voxels
- Parameters:
- img
SpatialImage All voxels of the mask should be of value 1, background should have value 0.
- img
- Returns:
- countint
Number of non-zero voxels
mask_volume¶
- nibabel.imagestats.mask_volume(img)¶
Compute volume of mask image.
Equivalent to “fslstats /path/file.nii -V”
- Parameters:
- img
SpatialImage All voxels of the mask should be of value 1, background should have value 0.
- img
- Returns:
- volumefloat
Volume of mask expressed in mm3.
Examples
>>> import numpy as np >>> import nibabel as nb >>> mask_data = np.zeros((20, 20, 20), dtype='u1') >>> mask_data[5:15, 5:15, 5:15] = 1 >>> nb.imagestats.mask_volume(nb.Nifti1Image(mask_data, np.eye(4))) 1000.0