The EIA 1956 Resolution Chart [1] [2] (until 1975 called RETMA Resolution Chart 1956) is a test card originally designed in 1956 to be used with black and white analogue TV systems, [3] [4] based on the previous (and very similar) RMA 1946 Resolution Chart. [5] [6] It consisted of a printed chart filmed by a TV camera or monoscope to be displayed on a TV screen, and was also available as individual rolls of test film to test broadcasting equipment. [7] Inspecting the chart allowed to check for defects like ringing, geometric distortions, raster scan linearity, cathode-ray tube uniformity and lack of image resolution. [8] [9] If needed, a technician could use it to perform the necessary hardware adjustments.
Today, this chart continues to be used to measure image resolution of modern cameras and lenses and also in scientific research. [3] [10] [11] [12] [13] [14] [15]
The chart is composed of several features, each designed for a specific test: [16]
Used with early monochrome TV systems, this chart was useful in measuring image resolution, determined by inspection of the image as displayed on a CRT. On such systems an important measure is the limiting horizontal resolution, affected by hardware and transmission quality (vertical resolution is fixed and determined by the video standard used, usually 525 lines or 625 lines).
This test card was transmitted by NRK in Norway (in conjunction with the monochrome Pye Test Card G), [17] [18] CKCK-TV in Saskatchewan, Canada (525-lines variant), [19] KRMA-TV, [20] KVVV-TV, [21] WVIZ-TV, [22] WHYY-TV [23] and WUAB-TV [24] in the United States (525-lines variant; WUAB-TV's version later partially overlaid on SMPTE color bars), RTBF and VRT [25] in Belgium, NTS [26] in the Netherlands, Magyar Televízió in Hungary, TVP [27] in Poland, [28] American Forces Network in West Germany (525-lines variant, sometimes also with the centre portion overlaid on top of Multiburst test pattern), [29] Yugoslav Radio Television in the former SFR Yugoslavia, Rediffusion Television in British Hong Kong (where it replaced a modified version of the 1950s Marconi-designed Associated-Rediffusion "diamond" test card), Egypt and Syria. [30] It was also used by the pirate TV Noordzee station broadcasting to the Netherlands in the 1960s. [31]
This chart, in conjunction with the RMA 1946 Resolution Chart [32] and later widescreen patterns, is commonly used to test consumer and professional standalone, smartphone and tablet cameras for photo and videography [11] and other imaging equipment like microscopes [8] or CCTV cameras. [10] [33]
Some variations of the EIA resolution test chart exist. Two Japanese variants of the EIA 1956 resolution chart are called "ITE Resolution Chart /EIAJ Test Chart A" [34] and " JEITA Test Chart II". [35] A widescreen update of the EIA 1956 resolution chart was developed around the 1980s for the HD-MAC broadcasting standard, [36] which was later modified by the Institute of Image Information and Television Engineers of Japan as its ITE Resolution Chart for High-definition Televisions. [37] [38]
In continental Europe, [39] another variation known as Telefunken Test Card T05 [40] was used. It had five diagonal bars on the top left of the centre white circle and different resolution wedges reminiscent of the RMA 1946 Resolution Chart. It was also available as individual rolls of test film, particularly in the DACH countries. [16] As a test card, it was used on ARD (from the 1950s up to the 1970s), Hessischer Rundfunk, [40] Bayerischer Rundfunk, [41] WDR, [42] NWRV in northern Germany, [43] Yugoslav Radio Television, [44] [40] Österreichischer Rundfunk in Austria, [45] BRT [46] in Belgium, Doordarshan in India, some commercial TV stations in Australia, TVE in Spain, Israel Broadcasting Authority and Israeli Educational Television in Israel, and in early-1950s trial television tests by the KTH Royal Institute of Technology in Stockholm, Sweden. [30]
The centre portion of the Telefunken T05 test card was depicted on the obverse side of the 50 Years of Television commemorative coin minted on 9 March 2005 in Austria. [47]
The centre portion of the RMA 1946 Resolution Chart was featured on the cover of Die Kreuzen's 7" single of Pink Flag/Land of Treason, released in 1990. [48]
Phase Alternating Line (PAL) is a colour encoding system for analogue television. It was one of three major analogue colour television standards, the others being NTSC and SECAM. In most countries it was broadcast at 625 lines, 50 fields per second, and associated with CCIR analogue broadcast television systems B, D, G, H, I or K. The articles on analog broadcast television systems further describe frame rates, image resolution, and audio modulation.
A test card, also known as a test pattern or start-up/closedown test, is a television test signal, typically broadcast at times when the transmitter is active but no program is being broadcast.
Test Card F is a test card that was created by the BBC and used on television in the United Kingdom and in countries elsewhere in the world for more than four decades. Like other test cards, it was usually shown while no programmes were being broadcast. It was the first to be transmitted in colour in the UK and the first to feature a person, and has become an iconic British image regularly subject to parody.
SMPTE color bars are a television test pattern used where the NTSC video standard is utilized, including countries in North America. The Society of Motion Picture and Television Engineers (SMPTE) refers to the pattern as Engineering Guideline (EG) 1-1990. Its components are a known standard, and created by test pattern generators. Comparing it as received to the known standard gives video engineers an indication of how an NTSC video signal has been altered by recording or transmission and what adjustments must be made to bring it back to specification. It is also used for setting a television monitor or receiver to reproduce NTSC chrominance and luminance information correctly.
The Indian-head test pattern is a test card that gained widespread adoption during the black-and-white television broadcasting era as an aid in the calibration of television equipment. It features a drawing of a Native American wearing a headdress surrounded by numerous graphic elements designed to test different aspects of broadcast display. The card was created by RCA to be the standard image for their TK-1 monoscope, a simple video camera capable of producing only the image embedded within it. The pattern was introduced in 1939 and over the following two decades became a fixture of television broadcast across North America in 525-line resolution and abroad in 525-and 625-line resolution until it was obsoleted by the rise of color television in the 1960s.
A monoscope was a special form of video camera tube which displayed a single still video image. The image was built into the tube, hence the name. The tube resembled a small cathode ray tube (CRT). Monoscopes were used beginning in the 1950s to generate TV test patterns and station logos. This type of test card generation system was technologically obsolete by the 1980s.
The Philips circle pattern refers to a family of related electronically generated complex television station colour test cards. The content and layout of the original colour circle pattern was designed by Danish engineer Finn Hendil (1939–2011) in the Philips TV & Test Equipment laboratory in Amager near Copenhagen under supervision of chief engineer Erik Helmer Nielsen in 1966–67, largely building on their previous work with the monochrome PM5540 pattern. The first piece of equipment, the PM5544 colour pattern generator, which generates the pattern, was made by Finn Hendil and his group in 1968–69. The same team would also develop the Spanish TVE colour test card in 1973.
A closed-circuit television camera is a type of surveillance camera that transmits video signals to a specific set of monitors or video recording devices, rather than broadcasting the video over public airwaves. The term "closed-circuit" indicates that the video feed is only accessible to a limited number of people or devices with authorized access. Cameras can be either analog or digital. Walter Bruch was the inventor of the CCTV camera.
A video signal generator is a type of signal generator which outputs predetermined video and/or television oscillation waveforms, and other signals used in the synchronization of television devices and to stimulate faults in, or aid in parametric measurements of, television and video systems. There are several different types of video signal generators in widespread use. Regardless of the specific type, the output of a video generator will generally contain synchronization signals appropriate for television, including horizontal and vertical sync pulses or sync words. Generators of composite video signals will also include a colorburst signal as part of the output.
A gray card is a middle gray reference, typically used together with a reflective light meter, as a way to produce consistent image exposure and/or color in video production, film and photography.
The 1/4 inch Akai is a portable helical scan EIA and CCIR analog recording video tape recorder (VTR) with two video record heads on the scanning drum. The units were available with an optional RF modulator to play back through a TV set, as well as a detachable video monitor. The Akai Electric Ltd. VTR plant was in Tokyo, Japan.
441-line is the number of scan lines in some early electronic monochrome analog television systems. Systems with this number of lines were used with 25 interlaced frames per second in France from 1937 to 1956, Germany from 1939 to 1943, Italy from 1939 to 1940, as well as by RCA in the United States with 30 interlaced frames per second from 1938 to 1941. Broadcasts were planned in Finland for 1940, but eventually cancelled due to World War II. Some experiments with similar systems were carried out on the USSR in the 1930s and Japan in 1939.
Television lines (TVL) is a specification of an analog camera or monitor's horizontal image resolution. 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.
The Philips PM5540 was an early electronic video signal generator, which generated a monochrome test card that is considered to be a black-and-white predecessor of the widely used Philips PM5544 and the latter's related family of Philips circle test patterns. The content and layout of the pattern, as well as the generator, was designed and made by Danish engineer Finn Hendil (1939–2011) at the Philips TV & Test Equipment laboratory in Amager, south of Copenhagen in 1965–66.
The Telefunken FuBK is an electronic analogue television test card developed by AEG-Telefunken and Bosch Fernseh in West Germany as the successor to the monochrome T05 test card in the late-1960s and used with analogue 625-lines PAL broadcasts.
The TVE colour test card was an electronic analogue TV test card adopted by Televisión Española with the introduction of PAL colour broadcasts in 1975. It is notable for its unique design, created by the Danish engineer Finn Hendil (1939–2011) in 1973, under the supervision of Erik Helmer Nielsen at the Philips TV & Test Equipment laboratory in Amager, south of Copenhagen, the same team that developed the popular Philips PM5544 test pattern. It replaced a previous black and white version developed by Eduardo Gavilán.
UEIT - Universal Electronic Test Chart is a Soviet/Russian test card, designed to test TVs operating in the analogue SECAM colour standard.
The EBU colour bars is a television test card used to check if a video signal has been altered by recording or transmission, and what adjustments must be made to bring it back to specification. It is also used for setting a television monitor or receiver to reproduce chrominance and luminance information correctly. The EBU bars are most commonly shown arranged side-by-side in a vertical manner, though some broadcasters – such as TVP in Poland, and Gabon Télévision in Gabon – were known to have aired a horizontal version of the EBU bars.
Snell & Wilcox SW2 and SW4 "Zone Plate" Test Chart were TV test cards introduced in the 1990s and used with NTSC, PAL and SDTV systems.
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