Abstract :
A low entropy pyramidal image data structure suited for
lossless coding and progressive transmission is proposed in this work. The
new coder, called the progressively predictive pyramid (PPP) is based
on the well-known Laplacian pyramid. By introducing interresolution
predictors into the original Laplacian pyramid, we show that the entropy
level in the original pyramid can be reduced significantly. To take
full advantage of progressive transmission, a scheme is introduced to
create the predictor adaptively, thus eliminating the need to transmit
the predictor and reducing the coding overheads. A method for designing
the predictor is presented. Numerical results show that PPP is superior
to traditional approaches to pyramid generation in the sense that the
pyramids generated by PPP always have significantly lower entropy
values.
