Design and implementation of multidimensional Y-C separation filters for NTSC signals

A design method for three-dimensional Y-C separation filters for the NTSC signals is proposed. The 3-D spectral structure of the NTSC signals, together with some existing and previously proposed Y-C separation methods, are first reviewed to point out some drawbacks in these methods. Since the proposed Y-C separation filter consists of a horizontal one-dimensional FIR filter and a temporal-vertical two-dimensional nonseparable FIR filter, the design of the 2-D filter, which is more difficult to design than the 1-D one, is considered more fully. The design procedure is simplified by applying some 2-D frequency transformations and then formulated as a simple linear programming problem, which can be solved easily by the standard method (e.g., the revised simplex method). Another advantage of the approach is the flexibility as regards to the shape of the passband and the support of the impulse response. Two design examples are given and a hardware implementation is considered.<
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