Hierarchical image coding with diamond-shaped subbands
Xiaohui Li, Jie Wang, Peter H. Bauer, Ken D. Sauer · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1992
We present a sub-band image coding/decoding system using a diamond-shaped pyramid frequency decomposition to more closely match visual sensitivities than conventional rectangular bands. Filter banks are composed of simple, low order IIR components. The coder is especially designed to function in a multiple resolution reconstruction setting, in situations such as variable capacity channels or receivers, where images must be reconstructed without the entire pyramid of sub-bands. We use a nonlinear interpolation technique for lost subbands to compensate for loss of aliasing cancellation.