A psychophysically justified bit allocation algorithm for subband image coding systems

The authors present a psychophysically justified bit allocation algorithm for use with subband image coding systems. This algorithm is also appropriate for DCT and DFT (discrete cosine and discrete Fourier transform)-based analysis-synthesis systems, as well as many others. The subjective performance of the algorithm was compared with the performance of a related algorithm that seeks to minimize the mean-square coding error. A two-dimensional analysis-synthesis system of J.P. Princen and A.B. Bradley (IEEE Trans. on Acoust. Speech, and Signal Proc., vol.ASSP-34, no.5, p.1153-1161, Oct. 1986) was used for the comparison. It is found that the psychophysically justified algorithm is superior to the minimum-mean-square-error algorithm at low bit rates.<<ETX>>