| 摘要 |
<p>Frames of video signals are stored in frame memories (A-H). Multiplexor (31), chooses one of the digital signals to be the reference video signal. This reference signal is then subtracted from each of the stored video signals in difference circuits (37). Comparators (36) are used to insure that the difference signal is in the allowable range. Any signals which are out of range are omitted by the frame omit logic (43). The remaining frame video signals are added together by adder (39) and normalized to the existing number of frames by multiplexor (45). This normalized signal is then added to the reference signal by adder (33) to achieve the average of the video frame signals. By such averaging, since the noise is random, it is filtered out leaving only the desired picture. The averaging is performed only on areas of the picture which are close in both amplitude and color in adjacent frames. In this connection, in cases where there is no motion or scene changes between adjacent frames, the entire picture corresponding to such frames can be processed according to the present invention.</p> |
