Video resolution
Video resolution is one of those “fuzzy” things in life. It is common to see video resolutions quoted as “720×480” or “1920×1080.” However, those are just the number of horizontal samples and vertical scan lines, and do not necessarily convey the amount of useful information.
For example, an analog video signal can be sampled at 13.5 MHz to generate 720 samples per line. Sampling the same signal at 27 MHz would generate 1440 samples per line. However, only the number of samples per line has changed, not the resolution of the content.
Therefore, video is usually measured using lines of resolution. In essence, this is how many distinct black and white vertical lines can be seen across the display. This number is then normalized ...
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