This function computes the two-dimensional discrete cosine transform
(or its inverse) of the provide two-dimensional data array.
Result = DCT2D( image, INVERSE=inverse )
A two-dimensional array containing the data for which the two-
dimensional DCT is to be computed.
A keyword parameter that if set will cause the provided image data
to be treated as DCT coefficients and cause the function to
perform an inverse transformation to provide the spatial domain
representation of the data.
Result is a double precision, floating point array containing either the
DCT coefficients or the inverse for the provided data.
Written by: Carl Salvaggio
February, 2009 Original code
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