For a mixture of two pure materials, the measurement function is assumed to have the form

basis functions to the histogram of a voxel-sized region hvox. This produces the classification results (in terms of the weights a).

where ^double approximates the band-limiting filtering process, a convolution with a box filter, by interpolating the values within the region of mixtures linearly between c1 and c2, the mean values for the two materials:

/double(v; C, s) = J ^(x)%double(x! C> s) - v)dx

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