A sub-band coder for video signals is disclosed, which is easily realizable in VLSI due to its simple structure. The coder uses sets of two-tap finite impulse response (FIR) filters having equal-magnitude coefficients to decompose the video signal at multiple stages. In the preferred embodiment the sub-band...http://www.google.se/patents/US5097331?utm_source=gb-gplus-sharePatent US5097331 - Multiple block-size transform video coding using an asymmetric sub-band structure
