发明名称 |
VIDEO DIFFERENCE KEY GENERATOR |
摘要 |
A video difference key generator has stored reference video image. An input video image is compared with the reference video image by an absolute difference circuit which subtracts corresponding pixels of the two video images, the smaller from the larger, to produce a difference video image. The difference video image may be filtered, and then is input to a transfer function circuit to produce an output which may be used as a key signal for compositing video images. |
申请公布号 |
CA1314097(C) |
申请公布日期 |
1993.03.02 |
申请号 |
CA19870550001 |
申请日期 |
1987.10.22 |
申请人 |
GRASS VALLEY GROUP, INC. (THE) |
发明人 |
BARNETT, RONNIE D.;PARKES, STEVEN M. |
分类号 |
H04N5/272;H04N5/275;H04N5/278;H04N5/445;H04N7/18;H04N9/75 |
主分类号 |
H04N5/272 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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