发明名称 |
Movement detector for television signals |
摘要 |
A movement detector for television signals measures the difference between maximum and minimum values of the movement components of a picture difference signal over a chosen interval. A television signal at an input (12) is delayed in a picture delay (2), and the delayed and undelayed signals subtracted in a subtractor (1) to form a picture difference signal. This is rectified in rectifier (3) and smoothed in a filter (4). A maximum detector (6) and a minimum detector (7) are coupled to the filter output and are re-set at prescribed intervals. A subtractor (8) determines the difference between the output of detectors (6) and (7) and this is compared with a reference value in a comparator (9), the output of which is sampled and stored in a store (10).
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申请公布号 |
US4364087(A) |
申请公布日期 |
1982.12.14 |
申请号 |
US19800174426 |
申请日期 |
1980.08.01 |
申请人 |
BRITISH BROADCASTING CORPORATION |
发明人 |
STOREY, RICHARD;ROBERTS, ALAN |
分类号 |
H04N5/14;(IPC1-7):H04N7/18 |
主分类号 |
H04N5/14 |
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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