aspect ratio
Definition:
The aspect ratio of an image or other object is simply its width divided by its height. Traditional standard definition pictures have a 4:3 aspect ratio, where 4 represents the width and 3 represents the height. High definition pictures have a 16:9 aspect ratio.
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progressive scan
Progessive scan is a method for "painting" a video signal by displaying video lines sequentially (progressively) from top to bottom. This is in contrast to the alternating odd/even method used with an
interlaced signal. Progressive scan signals are considered superior to interlaces signals due to their scalability for high definition displays and the absence of quirks sometimes associated with interlaced signals.
