The paper deals with design techniques for nonlinear-phase filter banks (FIR and IIR) with applications to image/video subband coding. Nonlinearities of phase characteristics of the analysis filters are compensated in the synthesis filter bank by reversing of data (IIR case) or an impulse response (FIR case). The considerations are restricted to separable multi-level systems, i.e., one-dimensional two-band filter banks are the basic building blocks and therefore carefully considered in the paper. A design technique is described for nonlinear-phase FIR filter banks based on optimization. Moreover the design problem of bireciprocal recursive filters is considered by emphasizing the trade-off between the stopband attenuation and the impulse response length. Both the nonideal separation of subbands and the long impulse responses increase the amount of information to be encoded thus aggravating the overall coding efficiency defined by the relation between the compression ratio and the quality of reconstructed images. The choice of elliptic filters as well as some design techniques improving coding efficiency are also considered.<>
Design of nonlinear-phase filter banks for subband coding of images
Proceedings of 1st International Conference on Image Processing ; 2 ; 893-897 vol.2
1994-01-01
407360 byte
Conference paper
Electronic Resource
English
Design of Nonlinear-Phase Filter Banks for Subband Coding of Images
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