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The RMA 1946 Resolution Chart was transmitted by NTS and NOS in the Netherlands, SRG SSR in Switzerland, [18] VRT and RTBF in Belgium, RTP in Portugal, TVP in Poland, TVB in Hong Kong, [citation needed] Venevisión in Venezuela (525-lines variant; in conjunction with Indian-head test pattern), [citation needed] WISN-TV in Milwaukee, Wisconsin (525-lines variant) [19] and on low-powered ...
Snell & Wilcox SW2 and SW4 "Zone Plate" Test Chart (also referred to as Snell & Wilcox Test Pattern) were TV test cards introduced in the 1990s and used with NTSC, PAL and SDTV systems. [1] Popular versions of the test charts were made available on Laserdisc and DVD-Video, allowing home users and professionals to test and calibrate their equipment.
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A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
A precursor to the SMPTE test pattern was conceived by Norbert D. Larky (1927–2018) [5] [6] and David D. Holmes (1926–2006) [7] [8] of RCA Laboratories and first published in RCA Licensee Bulletin LB-819 on February 7, 1951. U.S. patent 2,742,525 Color Test Pattern Generator (now expired) was awarded on April 17, 1956, to Larky and Holmes. [9]
Test cards typically contain a set of patterns to enable television cameras and receivers to be adjusted to show the picture correctly (see SMPTE color bars).Most modern test cards include a set of calibrated color bars which will produce a characteristic pattern of "dot landings" on a vectorscope, allowing chroma and tint to be precisely adjusted between generations of videotape or network feeds.
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From 1 March 1975, the Dutch public broadcasting system also started to use the Philips circle pattern on its TV channels, replacing the monochrome RMA 1946 Resolution Chart, the electronic monochrome chequerboard test card generated by a Philips GM 2671/50 video signal generator, [141] the Philips PM5552 early colour test card, and after the ...