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Still video camera | |
---|---|
Application | Still photography & photojournalism |
Examples | Sony Mavica, Canon Xapshot |
Media | Video floppy (typical) |
Resolution | Typically limited to single SDTV (NTSC, PAL, or SECAM) field or frame |
A still video camera (SVC) is a type of electronic camera that takes still images and stores them as single frames of video. They peaked in popularity in the late 1980s[ citation needed ] and can be seen as the predecessor to the digital camera. However, unlike the latter, the image storage in such cameras is based on analog technology, rather than as a digital file.
The most common design has an image sensor and basic processing hardware similar to that of a consumer camcorder designed for analog television using the appropriate regional format (NTSC, PAL, or SECAM). However, instead of storing consecutive interlaced fields on tape to form a moving image, a single field or frame (combined from two fields) is extracted from the output video signal and saved on a rotating magnetic disk, typically a standard Video Floppy. During playback, the disk is spun at the frame rate of the video system with the field or frame being read repeatedly. This produces a conventional analog video signal that can be viewed on a normal television.
The resolution is limited by the device's playback system, which is equivalent to pausing a single field or frame from a video recorder. Since the image is stored as a conventional analog video field or frame, the resolution is limited to the regional SDTV format; in addition, since the images are not stored digitally, transferring the images to a computer requires a video capture card.
Canon began developing a still video system as early as 1977 following a secret presentation from Texas Instruments (TI). Processing the image data from a CCD sensor into a digital file would have required a supercomputer at the time, so a strategic decision was made to use analog recording methods, and Canon recruited Sony and other manufacturers to create a standard format, resulting in the Video Floppy. [1] Other members included JVC, Matsushita (Panasonic), Olympus, Philips, and RCA. [2]
The first still video camera was a prototype Mavica (a portmanteau of magnetic video camera), which was unveiled by Sony chair Akio Morita on August 24, 1981. [3] The prototype Mavica was equipped with an interchangeable lens and was approximately the size and weight of a conventional 35mm SLR camera at 5+1⁄8 in × 3+1⁄2 in × 2+1⁄16 in (130 mm × 89 mm × 52 mm) and 28 oz (790 g). It offered shutter speeds ranging from 1⁄60 to 1⁄2000 sec; the video floppy (branded "Mavipak" by Sony) was capable of storing up to 50 images. [3] : 130 The Mavica was equipped with a single CCD sensor with a basic resolution of 570×490, but resolution was limited to approximately 350 horizontal lines. This was because it was designed for video playback, which is composed of interlaced video fields of approximately 240–280 horizontal lines; the Mavica's resolution was slightly boosted by recording color information on a separate FM channel, instead of as a subcarrier to the analog signal. [3] : 131 At the time, Sony stated it would be 15 to 24 months before the Mavica would be marketed, at an estimated cost of US$660(equivalent to $1,970 in 2021) for the camera and an additional US$220(equivalent to $660 in 2021) for the playback unit. [4]
At the time, both Polaroid Corporation and Eastman Kodak were rumored to have developed competing still cameras similarly using image sensors instead of film. Polaroid offered no comment regarding Sony's Mavica, [3] : 131 but previously had published a patent describing a camera that stored images electronically by 1980. [5] [6] : 90 Kodak published its position in an internal employee newsletter: "Technical capability does not necessarily mean mass-market capability. For any number of reasons—including costs, convenience, quality, and size among others—electronic systems don't meet the needs and expectations of the amateur still-picture-taker." [3] : 131 Kodak was developing its own CCD sensors and prototype digital file-recording cameras, including both the Lloyd/Sasson 1975 digital camera [7] [8] and the 1988 1-megapixel monochrome "Electro-Optic Camera" for a U.S. Government client. [9]
The film companies would go on to release standalone appliances to view, record, and print images stored on video floppies, seeing the technology as a way to replace conventional film processing and slideshows, rather than film cameras. At Photokina '84, Fujifilm displayed its Fujix TV-Photo System, which was a Video Floppy player that could be connected to a user's TV; floppies could be created for a nominal fee when consumers dropped off film at a Fuji processing center in Japan. [10] Kodak showed off its initial still video efforts in 1985, including the Color Video Imager, a color printer designed to take any analog video signal, and the Still Video Player/Recorder, which transferred a single still frame from an analog video source to a video floppy. [11] [12] [13] : 9 The Color Video Imager displayed the input signal on a cathode-ray tube to expose a sheet of instant film; the Still Video Player/Recorder offered interline interpolation to improve the display of a single field; [14] estimated retail price was US$700(equivalent to $1,730 in 2021) for the Color Video Imager. [15] Sony would respond with the ProMavica Recorder, announced in May 1986. [16]
The Yomiuri Shimbun approached Canon in September 1983, asking for a SVC to use at the 1984 Los Angeles Olympics; the resulting system would also require a transmitter, receiver, and printer. [1] Canon's experiment was a success, and Yomiuri photographers would capture images of Japanese athletes from the 1984 Summer Olympics using a prototype Canon SVC (model D701) [1] and transmit them for rapid publication, which would have been impossible with conventional film photographs. [17] : 52–53 TI helped Canon develop the CCD sensor for the prototype D701. [1] The 1984 Summer Olympics proved to be fertile ground for SVC development; Sony developed a similar SVC system for the Asahi Shimbun and Nikon developed the NT-1000 Direct Transmitter for Kyodo News, although both Sony's and Nikon's systems were capable of only transmitting black and white images, while Canon provided color. [1] Nikon released the NT-1000 in 1983 as an alternative solution for photojournalists on location, the first portable machine to scan and transmit conventional film. [18]
At Photokina '84, Copal and Panasonic showed prototype SVCs. [10] Konica's prototype SVC, initially displayed in 1985, [19] and as a more advanced prototype in 1987, [20] carried an estimated price of US$4,000(equivalent to $9,500 in 2021). [21] Kodak demonstrated a prototype SVC in 1987; coverage focused on the handling of the prototype ("held the way binoculars are held" with top-mounted controls and rear displays) and weight, at 4 lb (1.8 kg). [21] [22]
Canon continued to develop the D701 into the RC-701, which was the first SVC to be marketed commercially in 1986, aimed at professional photographers and news agencies; [7] [23] three interchangeable dedicated lenses were developed for the RC-701, and FD-mount lenses could be attached via an adapter. [24] [25] The RC-701 used a 380,000-pixel CCD made by TI, and was priced at US$2,595(equivalent to $6,420 in 2021) for the body alone. [26] It was the cornerstone of Canon's pro-oriented Still Video System, which also included a transceiver and printer. [27] The total system cost was approximately US$33,000(equivalent to $82,000 in 2021). [28] The dye-sublimation printer that was developed for the system would go on to spawn a separate commercial line which Canon branded SELPHY. [1] Sony was second to market with the ProMavica MVC-A7AF of 1987, which offered the ability to record 10 seconds of audio. [21] [26] In November 1987, Minolta released two still video backs that could be fitted to its 7000 and 9000 autofocus SLRs, [29] designated SB-70(S) and SB-90(S), respectively. [30] The retail price in 1988 was US$2,915(equivalent to $6,680 in 2021) each. [31] Nikon countered by announcing its competing QV-1000C professional SVC with supporting system hardware, including two dedicated lenses and a transmitter, in August 1988. [18]
The first photographs in a United States newspaper taken with the Canon Still Video System were published in USA Today on October 19, 1987, covering the 1987 World Series. [32] However, due to their poor resolution, photojournalists generally were hesitant to adopt SVCs. [17] : 52–53 It has been reported that one of the Tianamen Square "tank man" photographs was captured using a Sony ProMavica; according to the cameraman, Johnathan Schaer of Cable News Network, it was instead a still field captured on videotape and sent using the transmitter for the ProMavica. [33]
By 1988 and 1989, the first SVCs marketed to consumers were announced at Photokina and Consumer Electronics Show (CES), respectively. Casio would be the first to market with its VS-101 in 1988, at an estimated price of US$1,500(equivalent to $3,440 in 2021). [34] At the 1989 CES, Sony's Mavica MVC-C1 was priced at US$900(equivalent to $1,970 in 2021), including the required MAP-T1 playback unit, and Canon's RC-250, aka Q-PIC/Ion/Xapshot, was under US$800(equivalent to $1,750 in 2021); in addition, the 1989 CES exhibited a prototype from Sanyo. [35] Both the Canon and Sony used the "High Band" recording format, which increased the luminance carrier frequency and bandwidth to improve resolution. [29] [36] The RC-250's CCD sensor was again developed with TI. [1] Other manufacturers of consumer-level SVCs included Fujifilm, Konica, Kyocera (as Yashica), Olympus, and Panasonic. [29]
However, the increased interest and availability of consumer SVCs was paralleled by the rise of still cameras recording digital files, which was marked by rapid developments including the prototype Fujix DS-1P, announced at Photokina '88 and equipped with a removable memory card developed with Toshiba; [37] the Dycam Model 1 of 1990, also marketed as the Logitech FotoMan as the first consumer digital camera; [7] the 1991 Nikon F3-based Kodak DCS 100 for professionals; [9] and the Casio QV-10 of 1995, which was equipped with a color LCD, allowing users to review and delete still images on the same unit. [38] [39] The increased resolution and enhanced capabilities of digital cameras soon eclipsed the features of SVCs; in a 1995 review comparing digital and still video cameras, MacWorld concluded the digital cameras had superior resolution, but cited the large resolution gap between the high-end digital cameras (at 1.5MP) and 35mm film (estimated at 20MP). [40] Most SVCs were discontinued by the mid 1990s.
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