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Television lines (TVL) is a specification of an analog camera or monitor's horizontal image resolution. [1] The TVL is one of the most important resolution measures in a video system. The TVL can be measured with the standard EIA 1956 resolution chart .
Image resolution is the level of detail of an image. The term applies to digital images, film images, and other types of images. "Higher resolution" means more image detail. Image resolution can be measured in various ways. Resolution quantifies how close lines can be to each other and still be visibly resolved. Resolution units can be tied to ...
The original 1991 pattern contains high frequency components which were useful for testing widescreen televisions in factories, specifically 450/400 TVL diagonal lines and a sixth 5.8 MHz grating. This however made it sub-optimum for public broadcasts as these exceeded the bandwidth of most PAL transmission systems.
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The resolution of 960H depends on whether the equipment is PAL or NTSC based: 960H represents 960 x 576 (PAL) or 960 x 480 (NTSC) pixels. [29] 960H represents an increase in pixels of some 30% over standard D1 resolution, which is 720 x 576 pixels (PAL), or 720 x 480 pixels (NTSC). The increased resolution over D1 comes as a result of a longer ...
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VHS horizontal resolution is 240 TVL, or about 320 lines across a scan line. The vertical resolution (number of scan lines) is the same as the respective analog TV standard (625 for PAL or 525 for NTSC ; somewhat fewer scan lines are actually visible due to overscan and the VBI ).