THE APPLICATION OF 2-DIMENSIONAL FINITE-PRECISION IIR FILTERS TO ENHANCED NTSC CODING

The goal of this paper is to study the application of two-dimensional (2-D) finite-precision infinite impulse response (IIR) filters to enha nced National Television System Committee (NTSC) coding, It is well-kn own that suitable two- or three-dimensional (3-D) digital filtering gr eatly improves the quality of NTSC pictures by suppressing the interfe rence between the luminance Y and the chrominances I, Q, Thus far, 2-D and 3-D finite impulse response (FIR) filters have been used to reduc e or eliminate these cross effects, To achieve good performance, howev er, they require many coefficients, Since, in general, IIR filters nee d fewer coefficients to approximate a given magnitude response, we inv estigate here the possibility of applying 2-D IIR filters to the NTSC encoding/decoding. We also study the feasibility of using digital filt ers for NTSC channel filtering; this would permit a digital-only encod er, To design suitable filters, we use a recently proposed method base d on multiple constraint optimization and simulated annealing, We prop ose a new implementation structure for the IIR filters that differs fr om the zero-phase FIR structure, We simulate the full NTSC coding chai n and compare the resulting images for both filter types.