H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/53
H04N 9/75 (2006.01) H04N 5/275 (2006.01)
Patent
CA 1131766
ABSTRACT OF THE DISCLOSURE In chroma-key tracking systems it is known to compress and insert a second television picture into an area corresponding to a chroma-key frame located at a specified position in a first television picture. When the frame is shifted, there is a time lag before the compressed picture shifts correspondingly. In that interval, the second picture is compressed to in- clude the unused and noisy component of the shifted frame. A poor picture results. The present invention describes a chroma-key tracking system which prevents the generation of this unnecessary and noisy component of the shifted frame. A key signal is generated which represents the chroma-key frame and which is positioned in the first picture. A position signal, pro- duced in response to the key signal, determines the position of a frame cir- cumscribed about the key frame. An imaginary frame is produced in response to an imaginary-frame position signal to be greater in size than the key frame. A compressed second picture is produced from a compressed second video signal which in turn is a function of a second video signal and the imaginary-frame position signal. The second picture is compressed to be identical in size to the imaginary frame. The first video and second com- pressed video signals are then gated in response to the key signal with the result that the compressed picture is inserted into the chroma-key frame in the first picture.
307185
Inaba Masao
Kashigi Kazuo
Nippon Electric Co. Ltd.
Smart & Biggar
LandOfFree
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