HD, High Definition

HD, High Definition: High-definition video (HDTV Video or HD video) is a video of higher resolution and quality than standard definition. While there is no standardized meaning for high-definition, generally any video image with considerably more than 480 vertical scan lines (North America) or 576 vertical lines (Europe) is considered high-definition. 480 scan lines are generally the minimum even though the majority of systems greatly pass that.

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