Бейнекамера және бейнежазу құрылғысы

Video camera with built in video recorder

A camcorder is a self contained portable electronic device with video and recording as its primary function. It is typically equipped with an articulating screen mounted on the left side, a belt to facilitate holding on the right side, hot swappable battery facing towards the user, hot swappable recording media, and an internally contained quiet optical zoom lens. The earliest camcorders were tape based, recording analog signals onto videotape cassettes. In the 2000s, digital recording became the norm, and additionally tape was replaced by storage media such as mini HDD, MiniDVD, internal flash memory and SD cards. More recent devices capable of recording video are camera phones and digital cameras primarily intended for still pictures, whereas dedicated camcorders are often equipped with more functions and interfaces than more common cameras, such as an internal optical zoom lens that is able to operate silently with no throttled speed, whereas cameras with protracting zoom lenses commonly throttle operation speed during video recording to minimize acoustic disturbance. Additionally, dedicated units are able to operate solely on external power with no battery inserted.

Video cameras originally designed for television broadcast were large and heavy, mounted on special pedestals and wired to remote recorders in separate rooms. As technology improved, out of studio video recording was possible with compact video cameras and portable video recorders; a detachable recording unit could be carried to a shooting location. Although the camera itself was compact, the need for a separate recorder made on location shooting a two person job. Specialized videocassette recorders were introduced by JVC (VHS) and Sony (U matic, with Betamax) releasing a model for mobile work. Portable recorders meant that recorded video footage could be aired on the early evening news, since it was no longer necessary to develop film. In 1983, Sony released the first camcorder, the Betacam system, for professional use. A key component was a single camera recorder unit, eliminating a cable between the camera and recorder and increasing the camera operator's freedom. The Betacam used the same cassette format ( tape) as the Betamax, but with a different, incompatible recording format. It became standard equipment for broadcast news. Sony introduced its compact 8 mm Video8 format in 1985. That year, Panasonic, RCA and Hitachi began producing camcorders using a full size VHS cassette with a three hour capacity. These shoulder mount camcorders were used by videophiles, industrial videographers and college TV studios. Full size Super VHS (S VHS) camcorders were released in 1987, providing an inexpensive way to collect news segments or other videographies. Sony upgraded Video8, releasing the Hi8 in competition with S VHS. Digital technology emerged with the 1986 Sony D1, a device which recorded uncompressed data and required a large amount of bandwidth for its time. In 1992 Ampex introduced DCT, the first digital video format with data compression using the discrete cosine transform algorithm present in most commercial digital video formats. In 1995 Sony, JVC, Panasonic and other video camera manufacturers launched DV, which became a de facto standard for home video production, independent filmmaking and citizen journalism. That year, Ikegami introduced Editcam (the first tapeless video recording system). Camcorders using DVD media were popular at the turn of the 21st century due to the convenience of being able to drop a disc into the family DVD player; however, DVD capability, due to the limitations of the format, is largely limited to consumer level equipment targeted at people who are not likely to spend any great amount of effort video editing their video footage. Hitachi released the world's first DVD RAM camcorder in 2000, using the more compact 8 cm MiniDVD.

The Sony HDVS system, launched in 1984, allowed 1080i recording in the early 1990s. Sony later released a HD version of Betacam called HDCAM in 1997. Panasonic launched DVCPRO HD in 2000, expanding the DV codec to support high definition (HD). The format was intended for professional camcorders, and used full size DVCPRO cassettes. In 2003 Sony, JVC, Canon and Sharp introduced HDV as the first affordable HD video format, due to its use of inexpensive MiniDV cassettes.

Sony introduced the XDCAM tapeless video format in 2003, introducing the Professional Disc (PFD). Panasonic followed in 2004 with its P2 solid state memory cards as a recording medium for DVCPRO HD video. In 2006 Panasonic and Sony introduced AVCHD as an inexpensive, tapeless, high definition video format. AVCHD camcorders are produced by Sony, Panasonic, Canon, JVC and Hitachi. About this time, some consumer grade camcorders with hard disk and/or memory card recording used MOD and TOD file formats, accessible by USB from a PC.

In 2010, after the success of James Cameron's 2009 3D film Avatar, full 1080p HD 3D camcorders entered the market. With the proliferation of file based digital formats, the relationship between recording media and recording format has declined; video can be recorded onto different media. With tapeless formats, recording media are storage for digital files. In 2011 Panasonic, Sony, and JVC released consumer grade camcorders capable of filming in 3D. Panasonic released the HDC SDT750. It is a 2D camcorder which can shoot in HD; 3D is achieved by a detachable conversion lens. Sony released a 3D camcorder, the HDR TD10, with two lenses built in for 3D filming, and can optionally shoot 2D video. Panasonic has also released 2D camcorders with an optional 3D conversion lens. The HDC SD90, HDC SD900, HDC TM900 and HDC HS900 are sold as "3D ready": 2D camcorders, with optional 3D capability at a later date. JVC also released a twin lens camcorder in 2011, JVC Everio GS TD1.

In CES (January) 2014, Sony announced the first consumer/low end professional ("prosumer") camcorder Sony FDR AX100 with a 1" 20.9MP sensor able to shoot 4K video in 3840x2160 pixels 30fps or 24fps in the XAVC S format; in standard HD the camcorder can also deliver 60fps. When using the traditional format AVCHD, the camcorder supports 5.1 surround sound from its built in microphone, this is however not supported in the XAVC S format. The camera also has a 3 step ND filter switch allowing greater control of how much light can enter the camera for maintaining a shallow depth of field or giving a softer appearance to motion. For one hour video shooting in 4K the camera needs about 32 GB to accommodate a data transfer rate of 50 Mbit/s. The camera's MSRP in the US is USD $2,000. In 2015, consumer UHD (3840x2160) camcorders below USD $1000 became available. Sony released the FDRAX33, and Panasonic released the HC WX970K and the HC VX870. In September 2014 Panasonic announced and claimed 4K Ultra HD Camcorder HC X1000E as the first conventional camcorder design that can capture up to 60fps at 150 Mbit/s or alternatively standard HD recording at up to 200 Mbit/s in ALL I mode with MP4, MOV and AVCHD formats all offered depending on the resolution and frame rate. With use 1/2.3" small sensor as commonly is used by bridge cameras, the camcorder has 20x optical zoom in a compact body with dual XLR audio inputs, Internal ND filters and separate control rings for focus, iris and zoom. In HD capture, the camcorder enables in camera downscaling of the 4K image to HD to reduce noise inherent in the smaller sensor. As of January 2017, the only major manufacturer to announce new consumer camcorders at CES (Consumer Electronic Show) in Las Vegas was Canon with its entry level HD models. Panasonic only announced details regarding their Mirrorless Micro Four Thirds Digital Camera called the LUMIX GH5, capable of shooting 4K in 60p. This is the first time in decades that Panasonic and Sony have not announced new traditional camcorders at CES, and instead carried over 2016's models, such as Sony's FDR AX53. This is due to there being far less demand in the market for traditional camcorders as more and more consumers prefer to record video with their 4K capable smartphones, DSLRs, and action cameras from GoPro, Xiaomi, Sony, Nikon, and many others.

Camcorders have three major components: lens, imager and recorder. The lens gathers light, focusing it on the imager. The imager (usually a CCD or CMOS sensor; earlier models used vidicon tubes) converts incident light into an electrical signal. The recorder converts the electrical signal to video, encoding it in a storable form. The lens and imager comprise the "camera" section.

The imager, often a CCD, or a photodiode array which may be an Active Pixel Sensor, converts light into an electrical signal. The camera lens projects an image onto the imager surface, exposing the photosensitive array to light. This light exposure is converted into an electrical charge. At the end of the timed exposure, the imager converts the accumulated charge into a continuous analog voltage at the imager's output terminals. After the conversion is complete, the photosites reset to start the exposure of the next video frame. In many cases the photosites (per pixel) are actually reset globally by charging to a fixed voltage, and discharged towards zero individually proportionally to the accumulated light, because it is simpler to manufacture the sensor that way. Most camcorders use a single imaging sensor with integrated colour filters, per pixel, to enable red, green and blue to be sensed, each on their own set of pixels. The individual pixel filters present a significant manufacturing challenge. However some camcorders, even consumer grade devices such as the JVC GZ HD3, introduced around 2007, are triple sensor cameras, usually CCD but could be CMOS. In this case the exact alignment of the three sensors so that the red, green and blue components of the video output are correctly aligned, is the manufacturing challenge.

The recorder writes the video signal onto a recording medium, such as magnetic videotape. Since the record function involves many signal processing steps, some distortion and noise historically appeared on the stored video; playback of the stored signal did not have the exact characteristics and detail as a live video feed. All camcorders have a recorder controlling section, allowing the user to switch the recorder into playback mode for reviewing recorded footage, and an image control section controlling exposure, focus and color balance. The image recorded need not be limited to what appeared in the viewfinder. For documenting events (as in law enforcement), the field of view overlays the time and date of the recording along the top and bottom of the image. The police car or constable badge number to which the recorder was given, the car's speed at the time of recording, compass direction and geographical coordinates may also be seen.

Dedicated camcorders are usually equipped with optical image stabilization, optical zoom, stereo microphone, and touch screen. Additional possible features include a viewfinder (usually digital), a pressure sensitive knob for zooming at a controllable speed, LED lamp for illuminating in darkness – possibly with an option to adjust automatically, night vision which may be assisted by an infrared lamp, still photography, the ability to capture still photos while filming – usually at a higher resolution than the video, the ability to lock the OIS on far subjects while zoomed in (named "OIS Lock" by Panasonic), the ability to buffer footage before pressing the "record" button to avoid missing moments without having to be constantly recording (named "PRE REC" by Panasonic), the ability to keep the lens cover open for few minutes into stand by mode for rapid restarting, internal storage for recording when the inserted memory card's space is exhausted, autofocus able to track objects, and optional visual effects during video recording and playback. :p37

Metadata such as date/time and technical parameters may be stored in a separate subtitle track. The former allows measuring the exact and undistorted recording time of scenes even if intermittently paused, and the latter may encompass aperture, frames' exposure duration, exposure value, and photosensitivity. On digital camcorders, the video resolution, frame rate, and/or bit rate may be adjustable between higher quality but larger file sizes and lower quality but extended recording time on remaining storage. The image sensor may have a higher resolution than the recorded video, allowing for lossless digital zoom by cropping the area read out from the image sensor. The video player may allow for navigation between individual frames and extraction of still frames from footage to standalone pictures. have no longer been manufactured in consumer camcorders since 2006. In the earliest analog camcorders the imaging device is vacuum tube technology, in which the charge of a light sensitive target was directly proportional to the amount of light striking it; the Vidicon is an example of such an imaging tube. Newer analog, and digital camcorders use a solid state charge coupled imaging device (CCD) or a CMOS imager. Both are analog detectors, using photodiodes to pass a current proportional to the light striking them. The current is then digitised before being electronically scanned and fed to the imager's output. The main difference between the two devices is how the scanning is done. In the CCD the diodes are sampled simultaneously, and the scan passes the digitised data from one register to the next. In CMOS devices, the diodes are sampled directly by the scanning logic. Digital video storage retains higher quality video than analog storage, especially on the prosumer and strictly consumer levels. MiniDV storage allows full resolution video (720x576 for PAL, 720x480 for NTSC), unlike analog consumer video standards. Digital video does not experience colour bleeding, jitter, or fade. Unlike analog formats, digital formats do not experience generation loss during dubbing; however, they are more prone to complete loss. Although digital information can theoretically be stored indefinitely without deterioration, some digital formats (like MiniDV) place tracks only about 10 micrometers apart (compared with 19–58 μm for VHS). A digital recording is more vulnerable to wrinkles or stretches in the tape which could erase data, but tracking and error correction code on the tape compensates for most defects. On analog media, similar damage registers as "noise" in the video, leaving a deteriorated (but watchable) video. DVDs may develop DVD rot, losing large chunks of data. An analog recording may be "usable" after its storage media deteriorates severely, but slight media degradation in digital recordings may trigger an "all or nothing" failure; the digital recording will be unplayable without extensive restoration.

Older digital camcorders record video onto tape digitally, microdrives, hard drives, and small DVD RAM or DVD Rs. Newer machines since 2006 record video onto flash memory devices and internal solid state drives in MPEG 1, MPEG 2 or MPEG 4 format. Because these codecs use inter frame compression, frame specific editing requires frame regeneration, additional processing and may lose picture information. Codecs storing each frame individually, easing frame specific scene editing, are common in professional use. Other digital consumer camcorders record in DV or HDV format on tape, transferring content over FireWire or USB 2.0 to a computer where large files (for DV, 1 GB for 4 to 4.6 minutes in PAL/NTSC resolutions) can be edited, converted and recorded back to tape. The transfer is done in real time, so the transfer of a 60 minute tape requires one hour to transfer and about 13 GB of disk space for the raw footage (plus space for rendered files and other media).

A tapeless camcorder is a camcorder that does not use video tape for the digital recording of video productions as 20th century ones did. Tapeless camcorders record video as digital computer files onto data storage devices such as optical discs, hard disk drives and solid state flash memory cards. Inexpensive pocket video cameras use flash memory cards, while some more expensive camcorders use solid state drives or SSD; similar flash technology is used on semi pro and high end professional video cameras for ultrafast transfer of high definition television (HDTV) content. Most consumer level tapeless camcorders use MPEG 2, MPEG 4 or its derivatives as video coding formats. They are normally capable of still image capture to JPEG format additionally. Consumer grade tapeless camcorders include a USB port to transfer video onto a computer. Professional models include other options like Serial digital interface (SDI) or HDMI. Some tapeless camcorders are equipped with a FireWire (IEEE 1394) port to ensure compatibility with magnetic tape based DV and HDV formats.

Since the consumer market favors ease of use, portability and price, most consumer grade camcorders emphasize handling and automation over audio and video performance. Most devices with camcorder capability are camera phones or compact digital cameras, in which video is a secondary capability. Some pocket cameras, mobile phones and camcorders are shock , dust and waterproof. The consumer camcorder was generally still very expensive throughout the early to mid 1990s but prices compared to the 1980s had halved for an entry level model and fell even further at the turn of the millennium placing them in easier reach of basic income consumers with the addition of available and more easy to obtain credit to spread payments. This market has followed an evolutionary path driven by miniaturization and cost reduction enabled by progress in design and manufacture. Miniaturization reduces the imager's ability to gather light; designers have balanced improvements in sensor sensitivity with size reduction, shrinking the camera imager and optics while maintaining relatively noise free video in daylight. Indoor or dim light shooting is generally quiet, and in such conditions artificial lighting is recommended. Mechanical controls cannot shrink below a certain size, and manual camera operation has given way to camera controlled automation for every shooting parameter (including focus, aperture, shutter speed and color balance). The few models with manual override are menu driven. Outputs include USB 2.0, Composite and S Video and IEEE 1394/FireWire (for MiniDV models). The high end of the consumer market emphasizes user control and advanced shooting modes. More expensive consumer camcorders offer manual exposure control, HDMI output and external audio input, progressive scan frame rates (24fps, 25fps, 30fps) and higher quality lenses than basic models. To maximize low light capability, color reproduction and frame resolution, multi CCD/CMOS camcorders mimic the 3 element imager design of professional equipment. Field tests have shown that most consumer camcorders (regardless of price) produce noisy video in low light. Before the 21st century, video editing required two recorders and a desktop video workstation to control them. A typical home personal computer can hold several hours of standard definition video, and is fast enough to edit footage without additional upgrades. Most consumer camcorders are sold with basic video editing software, so users can create their own DVDs or share edited footage online. Since 2006, nearly all camcorders sold are digital. Tape based (MiniDV/HDV) camcorders are no longer popular, since tapeless models (with an SD card or internal SSD) cost almost the same but offer greater convenience; video captured on an SD card can be transferred to a computer faster than digital tape. None of the consumer class camcorders announced at the 2006 International Consumer Electronics Show recorded on tape.

Interchangeable lens camcorders can capture HD video with DSLR lenses and an adapter.

In 2011, Sony launched its HDR PJ range of HD camcorders: the HDR PJ10, 30 and 50. Known as Handycams, they were the first camcorders to incorporate a small image projector on the side of the unit. This feature allows a group of viewers to watch video without a television, a full size projector or a computer. These camcorders were a huge success and Sony subsequently released further models in this range. Sony's 2014 line up comprises the HDR PJ240, HDR PJ330 (entry level models), HDR PJ530 (mid range model) and the HDR PJ810 (top of the range). Specifications vary by model.

Camcorders are used by nearly all electronic media, from electronic news organizations to current affairs TV productions. In remote locations, camcorders are useful for initial video acquisition; the video is subsequently transmitted electronically to a studio or production center for broadcast. Scheduled events (such as press conferences), where a video infrastructure is readily available or can be deployed in advance, are still covered by studio type video cameras "tethered" to production trucks.

Camcorders often cover weddings, birthdays, graduations, children's growth and other personal events. The rise of the consumer camcorder during the mid to late 1980s led to the creation of TV shows such as America's Funniest Home Videos, which showcases homemade video footage.

Camcorders are used in the production of low budget TV shows if the production crew lacks access to more expensive equipment. Movies have been shot entirely on consumer camcorder equipment, including The Blair Witch Project, 28 Days Later and Paranormal Activity. Academic filmmaking programs switched from 16mm film to digital video in the early 2010s, due to the reduced expense and ease of editing of digital media and the increasing scarcity of film stock and equipment. Some camcorder manufacturers cater to this market; Canon and Panasonic support 24p (24 fps, progressive scan—the same frame rate as cinema film) video in some high end models for easy film conversion.

Schools in the developed world increasingly use digital media and digital education. Students use camcorders to record video diaries, make short films and develop multi media projects across subject boundaries. Teacher evaluation involves a teacher's classroom lessons being recorded for review by officials, especially for questions of teacher tenure. Student camcorder created material and other digital technology are used in new teacher preparation courses. The University of Oxford Department of Education PGCE programme and NYU's Steinhardt School's Department of Teaching and Learning MAT programme are examples. The USC Rossier School of Education goes further, insisting that all students purchase their own camcorder (or similar) as a prerequisite to their MAT education programs (many of which are delivered online). These programs employ a modified version of Adobe Connect to deliver the courses. Recordings of MAT student work are posted on USC's web portal for evaluation by faculty as if they were present in class. Camcorders have allowed USC to decentralize its teacher preparation from Southern California to most American states and abroad; this has increased the number of teachers it can train.

Since most manufacturers focus their support on Windows and Mac users, users of other operating systems have difficulty finding support for their devices. However, open source products such as Kdenlive, Cinelerra and Kino (written for the Linux operating system) allow editing of most popular digital formats on alternative operating systems and can be used in conjunction with OBS for online broadcast solutions; software to edit DV streams is available on most platforms.

The issue of digital camcorder forensics to recover data (e. g. video files with timestamps) has been addressed.