Fundamental Concepts in Video
Fundamental Concepts in Video
Fundamental Concepts in Video
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<strong>Fundamental</strong>s of Multimedia, Chapter 5<br />
• NTSC video is an analog signal with no fixed horizontal resolution.<br />
Therefore one must decide how many times to sample<br />
the signal for display: each sample corresponds to one pixel<br />
output.<br />
• A “pixel clock” is used to divide each horizontal l<strong>in</strong>e of video<br />
<strong>in</strong>to samples. The higher the frequency of the pixel clock,<br />
the more samples per l<strong>in</strong>e there are.<br />
• Different video formats provide different numbers of samples<br />
per l<strong>in</strong>e, as listed <strong>in</strong> Table 5.1.<br />
Table 5.1: Samples per l<strong>in</strong>e for various video formats<br />
Format<br />
Samples per l<strong>in</strong>e<br />
VHS 240<br />
S-VHS 400-425<br />
Betamax 500<br />
Standard 8 mm 300<br />
Hi-8 mm 425<br />
14 Li & Drew c○Prentice Hall 2003
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