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Multi-dimensional prefiltering, sampling rate reduction and interpolation of HDTV signals. I

: Schamel, G.

Frequenz 42 (1988), No.10, pp.284-8
ISSN: 0016-1136
ISSN: 2191-6349
Journal Article
Fraunhofer HHI ()
filtering and prediction theory; high definition television; interpolation; multidimensional digital filters; picture processing; video signals; multidimensional subsampling; linear adaptive filters; 3d sampling patterns; multidimensional prefiltering; sampling rate reduction; HDTV signals; broadband HDTV; data rate; digital channel; fieldquincunx; linequincunx; interlaced signal; receiver; motion adaptive filter; detecting motion; transmitter; subsampled fields; filter algorithms

Multidimensional subsampling of a broadband HDTV (high definition television) signal makes it possible to adapt the data rate to a digital channel. Two three-dimensional sampling patterns, fieldquincunx and linequincunx, are used to subsampling the interlaced signal. Multidimensional digital filters are proposed for prefiltering before subsampling and for interpolation of the missing samples in the receiver. Linear and motion adaptive filter structures are described. A structure for detecting motion in the transmitter is explained. Algorithms for interpolating a sequence of progressive frames from subsampled fields are proposed for the receiver. Results from simulating the most important filter algorithms on TV- and HDTV-sequences are shown.