Measurement of chroma key area in television systems

Details Measurement of chroma key area in television systems Measurement of chroma key area in television systems

1979-01-22

1980-12-16

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

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H04N 9535

Patent

active

042401046

ABSTRACT:
A chroma key measuring system for determining the area of chroma key within a television picture. The position of each side of the key area is measured line by line to determine a maximum and minimum value, and top and bottom of the area is determined from the upper and lower cross over positions of the sides to provide an output indicative of the size and position of the key area. This output can be used as a control signal for further equipment generating a further picture which is to be inserted in the key area so that the size and position of the inserted picture is adjusted to correspond to the calculated parameters.

REFERENCES:
patent: 3740468 (1973-06-01), Gardner et al.
patent: 4163992 (1979-08-01), Inaba et al.
patent: 4178613 (1979-12-01), Takahashi et al.

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