tiling or blockiness factor 8 or 16 or to a resizing factor u2154 or 3 2 fig2 only shows by way of illustration the spectrum evaluator 20 for detecting in situ tiling or blockiness and u2154 resizing blockiness local oscillators at periods of b and u2154b lines are used to generate complex sine and cosine signals which are input to respective multipliers 22 24 26 28 to down convert the column vector cv to complex baseband real and imaginary parts the outputs from the in situ multipliers 22 24 are input to respective square summers 30 32 to produce the square of the sums pq sum q n u0302 2 and pi sum i n u0302 2 likewise the outputs from pre coded multipliers 26 28 are input to respective square summers 34 36 to produce the square of the sums p u2032 q sum q u2032 n u0302 2 and p u2032 i sum i u2032 n u0302 2 pq pi and p u2032 q p u2032 i represent the baseband power for each down conversion the column vector cv also is input to a square summer 38 to produce the sum of squares the respective square of the sums pq pi and p u2032 q p u2032 i are input to respective summers 42 44 which may be part of a software application 40 running on a processor with the outputs being converted to logarithmic values.