fmri_upsample

Description

FMRI_UPSAMPLE Restores spatially downsampled fMRI data to full resolution. Interpolates a downsampled brain dataset (from fmri_downsample) back to the full 228453-voxel vectorized space using the specified interpolation method. The downsampling factor is inferred automatically from the number of rows.

Usage

fmri2 = fmri_upsample(fmri)
fmri2 = fmri_upsample(fmri, method)

Inputs

FMRI: Downsampled vectorized data (M x T), where M is the number of voxels after downsampling (M < 228453).
METHOD: Interpolation method string: ‘linear’, ‘nearest’, ‘cubic’, ‘spline’. Default: ‘linear’.

Outputs

FMRI2: Upsampled data (228453 x T) at full brain resolution.

Examples

small = fmri_downsample(data, 2);
full  = fmri_upsample(small);
full  = fmri_upsample(small, 'spline');

Notes

Supported input sizes (factor: voxel count): 2: 28542, 3: 8468, 4: 3574,
5: 1820, 6: 1065, 7: 674, 8: 449, 9: 312, 10: 223.

See Also

fmri_downsample