Entropy-dependent adaptive image filtering

A method comprising:

• determining an entropy value associated with each of a plurality of voxels of a three-dimensional image;
• for each of the plurality of voxels:
• applying a filter to a value of a voxel to determine a replacement value for the voxel, wherein a first filter applied to a first value of a first voxel is determined based on a first entropy value associated with the first voxel, and a second filter applied to a second value of a second voxel is determined based on a second entropy value associated with the second voxel, the first filter being different from the second filter and the first entropy value being different from the second entropy value;
• and
• generating a filtered three-dimensional image based on the replacement value of each of the plurality of voxels.

A non-transitory computer-readable medium storing processor-executable process steps which when executed by a processing unit of a computing system, cause the computing system to:

• determine an entropy value associated with each of a plurality of voxels of a three-dimensional image;
• determine, for each of the plurality of voxels, a respective filter based on the entropy value associated with the voxel, wherein a first filter determined for a first voxel associated with a first entropy value is different from a second filter determined for a second voxel associated with a second entropy value different from the first entropy value;
• and
• apply, for each of the plurality of voxels, the respective filter to a value of the voxel to generate a replacement value for the voxel;
• and
• generate a filtered three-dimensional image based on the generated replacement value of each of the plurality of voxels.