| 摘要 |
The invention provides a system for modifying the electrical signal corresponding to the high frequency content of a video signal in accordance with variations in other parameters of the video signal, so as to render the modified signal substantially independent of such variations. Such modification is referred to as normalising the high frequency signal. One system is described for normalising with respect to the number of feature boundaries, another the density changes across the boundaries and another the obliquity of the boundaries to the scanning direction. A further modification allows improvement to the signal to noise ratio of the modified signal.
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