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In-Depth Information
F I GU R E 14 . 32
Sinan image coded at 0.5 bits per pixel using the eight-tap
Johnston filter.
F I GU R E 14 . 33
Sinan image coded at 0.5 bits per pixel using the eight-tap
Smith-Barnwell filter.
recursive bit allocation algorithm. In the image decomposed using the Johnston filter, there
was significant energy in the high-low band. The algorithm allocated 1 bit to the low-low band
and 1 bit to the high-low band. This resulted in poor encoding for both, and subsequently poor
reconstruction. There was very little signal content in any of the bands other than the low-low
band for the image decomposed using the Smith-Barnwell filter. Therefore, the bit allocation
algorithm assigned both bits to the low-low band, which provided a reasonable reconstruction.
