Deinterlacing of video using a variable coefficient spatio-tempo

Details Deinterlacing of video using a variable coefficient spatio-tempo Deinterlacing of video using a variable coefficient spatio-tempo

1996-06-25

1998-08-11

Powell, Mark R.

Television

Format conversion

Line doublers type

348441, 348443, 348458, H04N 701, H04N 1120

Patent

active

057934355

ABSTRACT:
A variable coefficient, non-separable spatio-temporal interpolation filter is used to deinterlace an interlaced video signal to produce a progressive video signal. The interlaced video signal is input to a video memory which in turn provides a reference and plurality of offset video signals representing the pixel being interpolated and spatially and temporally neighboring pixels. A coefficient index, transmitted with the interlaced video as an auxiliary signal, or derived from motion vectors transmitted with the interlaced video, or derived directly from the interlaced video signal, is applied to a coefficient memory to select a set of filter coefficients. The reference and offset video signals are weighted together with the filter coefficients in the spatio-temporal interpolation filter, such as a FIR filter, to produce an interpolated video signal. The interpolated video signal is interleaved with the reference video signal, suitably delayed to compensate for filter processing time, to produce the progressive video signal.

REFERENCES:
patent: 4636857 (1987-01-01), Achiha et al.
patent: 5351087 (1994-09-01), Christopher et al.
patent: 5471249 (1995-11-01), Monta et al.
patent: 5475437 (1995-12-01), Song
patent: 5488421 (1996-01-01), Hwang et al.

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