IIR filterbank for subband coding of images

The author presents a simple derivation of a separable two-dimensional uniform filterbank for subband coding of images. Each one-dimensional filterbank is tree-structured where the individual quadrature mirror filters are of the infinite-impulse response (IIR) type. Through the use of a combination of causal and anticausal filtering in the analysis and synthesis filter banks, respectively, perfect signal reconstruction is obtained. A subband coder model including quantization is given, and results concerning optimal filtering in a subjective sense are presented.<
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