Video overlay circuit and method for overlaying a video signal

Details Video overlay circuit and method for overlaying a video signal Video overlay circuit and method for overlaying a video signal

1997-10-14

2000-05-09

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Special effects

348599, 348705, H04N 976, H04N 5268

Patent

active

060610999

ABSTRACT:
A video overlay circuit (110) overlays a first video signal (COMPVID) with a second video signal (LUM2, CHROM2). The first video signal is partitioned by filtering out a first chrominance component (CHROM1) which is subtracted from the first video signal to produce a first luminance component (LUM1). A fast switch (5) switches between the first luminance component and a second luminance component (LUM2) of the second video signal over a transition period of clock cycles to produce an overlaid luminance signal. A slow switch (6) switches between the first chrominance component and a second chrominance component (CHROM2) of the second video signal over a transition period longer than the transition period of the fast switch to produce an overlaid chrominance signal. An adder (7) sums the overlaid luminance and chrominance signals to produce a composite output signal (VIDEO).

REFERENCES:
patent: 5119074 (1992-06-01), Greaves et al.
patent: 5903315 (1999-05-01), Itoh
patent: 5907369 (1999-05-01), Rumreich

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