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Figure 3. Interpolation occurs when voxels are inserted as a result of rotation or scaling of an image. Images (b) and (c) show image (a) rotated through 45 degrees, using linear and nearest neighbour interpolation, respectively. Linear interpolation inserts voxels along the junction of the orange and purple areas which have a value which is the mean of those in the outer areas, as can be seen on the colour bar. Nearest neighbour interpolation uses the values already existing in the outer areas, which has the effect of giving a pixelated, less smooth appearance.
