基本信息:
- 专利标题： METHOD AND APPARATUS FOR OVERLAPPING VIDEO IMAGE
- 申请号：JP4389186 申请日：1986-02-27
- 公开(公告)号：JPS61212172A 公开(公告)日：1986-09-20
- 发明人： BURAIAN ASUTORU , JIERARUDO DEIBITSUDO RIPUREI
- 申请人： RCA CORP
- 专利权人： RCA CORP
- 当前专利权人： RCA CORP
- 优先权： US70704485 1985-02-28
- 主分类号： H04N5/278
- IPC分类号： H04N5/278 ; G09G5/00 ; H04N5/272
摘要：
Computer generated or other video objects 18 may be superimposed over a background video image 14 so as to create the illusion of a single composite scene. The leading edge of an object is detected by one-shot 22 and for a period of time set by one-shot 22 the object 18 and background video 14 signals are mixed. After that period, only the object video 18 is transmitted. Upon detection of the object's trailing edge by one-shot 28, the two video signals are again mixed for a period of time set by one-shot 28. After this latter period, only the background video signal 14 is transmitted until another object's edge is detected. The mixing of the signals at the edges of the object produces a blending of the object into the background scene so that the object appears to be more realistically part of a single scene. The area of the foreground video signal around the object is maintained at a "blacker-than-black" level to ensure that object detail is not mistaken for an edge. Inverter 26 is provided since the one-shots trigger only on positive-going transitions. The delays 12, 20 are about half of one pixel period.
公开/授权文献:
- JPH0581112B2 公开/授权日：1993-11-11