Method and apparatus for converting a video signal to a correspo

Details Method and apparatus for converting a video signal to a correspo Method and apparatus for converting a video signal to a correspo

1984-02-03

1986-07-01

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358141, H04N 701

Patent

active

045983143

ABSTRACT:
A switch (7) changes its position field by field so that the first field of each frame of digitized video signals may be processed differently from the second field. One field may be furnished directly to the switch and the other one through a line interpolator. In another embodiment, one field is subjected to a simpler line interpolator and the other to a line interpolator using two stages of one line delay. The line interpolators preserve some of the quality of the higher line count signal produced by a high definition camera. The signals passing through the switch (7) are distributed line by line alternately to storage units (M1) and (M2), where they are written in at a sampling rate determined in accordance with the invention. They are read out at a lower sampling rate field by field alternately from the two storage means, so that one field is read out while two fields are written in, each with the desired lower line count and desired line length to avoid geometrical distortion. The relation of the first sampling rate to the various line data is determined by a formula in accordance with the invention, so as to avoid distortion of picture geometry.

REFERENCES:
patent: 4471381 (1984-09-01), Kasuga et al.
patent: 4496974 (1985-01-01), Heitmann

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