Television Standards Conversion - Standards Conversion Methods in Common Use - Nyquist Subsampling - How IT Works

How It Works

In a typical image transmission setup, all stationary images are transmitted at full resolution. Moving pictures possess a lower resolution visually, based on complexity of interframe image content.

When one uses Nyquist subsampling as a standards conversion technique, the horizontal and vertical resolution of the material are reduced – this is an excellent method for converting HDTV to standard definition television, but it works very poorly in reverse.

  • As the horizontal and vertical content change from frame to frame, moving images will be blurred (in a manner similar to using 16 mm movie film for HDTV projection).
  • In fact, whole-camera pans would result in a loss of 50% of the horizontal resolution.

The Nyquist subsampling method of systems conversion only works for HDTV to Standard Definition Television, so as a standards conversion technology it has a very limited use. Phase Correlation is usually preferred for HDTV to standard definition conversion.

Read more about this topic:  Television Standards Conversion, Standards Conversion Methods in Common Use, Nyquist Subsampling

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