Title :
Quantization error analysis of image sub-band filter banks
Author :
Westerink, P.H. ; Biemond, J. ; Boekee, D.E.
Author_Institution :
Dept. of Electr. Eng., Delft Univ. of Technol., Netherlands
Abstract :
The authors explicitly incorporate quantization errors into a quadrature-mirror-filter system by means of a quantizer model. This makes it possible to discriminate between different types of coding errors, such as aliasing errors, signal errors, and random errors. Both a mean-squared-error calculation and a subjective evaluation of the coding errors show that the aliasing errors are negligible for filter lengths of 16 taps or more. Random errors are especially annoying in flat areas and are due to a local quantizer mismatch. This kind of error can be reduced by utilizing adaptive quantizers.<>
Keywords :
analogue-digital conversion; coding errors; digital filters; error analysis; filtering and prediction theory; picture processing; QMF; adaptive quantizers; aliasing errors; coding errors; image sub-band filter banks; local quantizer mismatch; mean-squared-error calculation; picture processing; quadrature-mirror-filter system; quantisation error analysis; quantizer model; random errors; signal errors; subband filter; subjective evaluation; Band pass filters; Channel bank filters; Computer errors; Error analysis; Filtering; Finite impulse response filter; Image analysis; Image reconstruction; Quantization; Signal design;
Conference_Titel :
Circuits and Systems, 1988., IEEE International Symposium on
Conference_Location :
Espoo, Finland
DOI :
10.1109/ISCAS.1988.15050
