Alias detection and avoidance process used in the processing of video signals.
摘要
<p>The present invention relates to a method and apparatus for combining video signals with key signals whilst maintaining the integrity of the video signal and minimising the effect of alias components. The present invention detects whether there are any high frequency components which would otherwise cause alias components. If such high frequency components are present, then low-pass filtering occurs. If such high frequency components are not present, then no unnecessary filtering occurs so as to maintain the absolute integrity of the video signal. <IMAGE></p>
