Spatial scan converter with vertical detail enhancement

Details Spatial scan converter with vertical detail enhancement Spatial scan converter with vertical detail enhancement

1989-08-17

1991-05-14

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 11, 358 37, 358140, H04N 514

Patent

active

050161032

ABSTRACT:
A scan arrangement supplies real line video pixel information to an input demultiplexer that samples the pixels at a frequency of 4fc (fc=color subcarrier) and sequentially writes the sampled information in a series of line memories at an H (horizontal frequency) rate. A plurality of output multiplexers read information from the line memories at a 2H rate and supply it to a video interpolator where interpolated lines are produced based upon immediately adjacent real lines. The video output is at a 2H rate and consists of alternate real and interpolated lines in two successive fields. A vertical detail enhancement circuit combines pixel data from each set of three successive lines (upper (u), lower (l) and middle (m) lines) in accordance with the formula 2m-(u+1), to develop a vertical detail component.

REFERENCES:
patent: 4558347 (1985-12-01), Pritchard et al.
patent: 4698673 (1987-10-01), Johnson
patent: 4809069 (1989-02-01), Meyer et al.

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