Tuesday 28 September 2010
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Overall picture quality is intended to be comparable to VHS video,[4] but is actually half VHS resolution (330x486). Poorly compressed VCD video can sometimes be lower quality than VHS video, but VCD exhibits block artifacts (rather than the analog noise seen in VHS sources) and does not deteriorate further with each use.
352x240 (or SIF) resolution was chosen because it is half the vertical, and half the horizontal resolution of NTSC video. 352x288 is similarly one quarter PAL/SECAM resolution. This approximates the (overall) resolution of an analog VHS tape, which, although it has double the number of (vertical) scan lines, has a much lower horizontal resolution.
VCD video is mostly compatible with the DVD-Video standard, except for any video encoded at 23.976 frames per second.
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Overall picture quality is intended to be comparable to VHS video,[4] but is actually half VHS resolution (330x486). Poorly compressed VCD ...
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