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HDV
HDV is a format for recording of high-definition video on DV cassette tape. The format was originally developed by JVC and supported by Sony, Canon, and Sharp. The four companies formed the HDV Consortium in September 2003. Conceived as an affordable high definition format for digital camcorders, HDV quickly caught on with many amateur and professional videographers due to its low cost, portability, and image quality acceptable for many professional productions. HDV and HDV logo are trademarks of JVC and Sony. Video and audio coding HDV video and audio are encoded in digital form, using lossy interframe compression. Video is encoded with the H.262/MPEG-2 Part 2 compression scheme, using 8-bit chroma and luma samples with 4:2:0 chroma subsampling. Stereo audio is encoded with the MPEG-1 Layer 2 compression scheme. The compressed audio and video are multiplexed into an MPEG-2 transport stream, which is typically recorded onto magnetic tape, but can also be stored in a compu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canon HV30
This is a list of camcorders manufactured under the Canon brand. Canon Cinema EOS digital camcorders * Canon EOS-1D C *Canon EOS C70 *Canon EOS C100 *Canon EOS C100 Mark II * Canon EOS C200/C200B *Canon EOS C300 *Canon EOS C300 Mark II *Canon EOS C300 Mark III *Canon EOS C500 *Canon EOS C500 Mark II *Canon EOS C700 Professional digital camcorders *Canon XM1 (known in North America as the "Canon GL1") *Canon XA10 (March 2011) (HF G10 plus top handle) *Canon XA20 (June 2013) (HF G30 plus top handle) *Canon XA25 (June 2013) (XA20 plus HD-SDI output, otherwise the same camera) *Canon XA30 (November 2015) (HF G40 plus top handle) *Canon XA35 (November 2015) (XA30 plus HD-SDI output, otherwise the same camera) *Canon XA11 (December 2017) (HF G21 plus top handle) *Canon XA15 (December 2017) (XA11 plus HD-SDI output, otherwise the same camera) *Canon XA40 (April 2019) (HF G50 plus top handle) *Canon XA45 (April 2019) (XA40 plus HD-SDI output, otherwise the same camera) *Canon XA50 (June ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canon HV20
This is a list of camcorders manufactured under the Canon brand. Canon Cinema EOS digital camcorders * Canon EOS-1D C *Canon EOS C70 *Canon EOS C100 *Canon EOS C100 Mark II * Canon EOS C200/C200B *Canon EOS C300 *Canon EOS C300 Mark II *Canon EOS C300 Mark III *Canon EOS C500 *Canon EOS C500 Mark II *Canon EOS C700 Professional digital camcorders *Canon XM1 (known in North America as the "Canon GL1") *Canon XA10 (March 2011) (HF G10 plus top handle) *Canon XA20 (June 2013) (HF G30 plus top handle) *Canon XA25 (June 2013) (XA20 plus HD-SDI output, otherwise the same camera) *Canon XA30 (November 2015) (HF G40 plus top handle) *Canon XA35 (November 2015) (XA30 plus HD-SDI output, otherwise the same camera) *Canon XA11 (December 2017) (HF G21 plus top handle) *Canon XA15 (December 2017) (XA11 plus HD-SDI output, otherwise the same camera) *Canon XA40 (April 2019) (HF G50 plus top handle) *Canon XA45 (April 2019) (XA40 plus HD-SDI output, otherwise the same camera) *Canon XA50 (June ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ProHD
ProHD is a name used by JVC for its MPEG-2-based professional camcorders. ProHD is not a video recording format, but rather "an approach for delivering affordable HD products" and a common name for "bandwidth efficient professional HD models". Originally ProHD lineup consisted of shoulder mount HDV 720p camcorders and offered 24-frame/s progressive video recording and LPCM audio recording/playback. It is a common misconception that JVC developed ProHD as a proprietary extension to HDV. JVC has stressed that 24-frame/s video and LPCM audio have always been part of the HDV format, but at the time they were initially offered no other HDV camcorder had them. The company went to great lengths to promote the format as an appropriate solution for professional high definition video production. In 2009 JVC expanded the ProHD lineup with tapeless camcorders that record MPEG-2 video either in QuickTime QuickTime is an extensible multimedia framework developed by Apple Inc., cap ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Camcorder
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 2006, digital recording became the norm, with tape replaced by storage media such as mini-HD, microDVD, 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 thro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Progressive Segmented Frame
Progressive segmented Frame (PsF, sF, SF) is a scheme designed to acquire, store, modify, and distribute progressive scan video using interlaced equipment. With PsF, a progressive frame is divided into two ''segments'', with the odd lines in one segment and the even lines in the other segment. Technically, the segments are equivalent to interlaced ''fields'', but unlike native interlaced video, there is no motion between the two fields that make up the video frame: both fields represent the same instant in time. This technique allows for a progressive picture to be processed through the same electronic circuitry that is used to store, process and route interlaced video. The term ''progressive segmented frame'' is used predominantly in relation to high-definition video, high definition video. In the world of standard-definition video, which traditionally has been using interlaced scanning, it is also known as ''quasi-interlace'', ''progressive recording'' or ''movie mode''. Other na ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Videotape
Videotape is magnetic tape used for storing video and usually sound in addition. Information stored can be in the form of either an analog or digital signal. Videotape is used in both video tape recorders (VTRs) and, more commonly, videocassette recorders (VCRs) and camcorders. Videotapes have also been used for storing scientific or medical data, such as the data produced by an electrocardiogram. Because video signals have a very high bandwidth, and stationary heads would require extremely high tape speeds, in most cases, a helical-scan video head rotates against the moving tape to record the data in two dimensions. Tape is a linear method of storing information and thus imposes delays to access a portion of the tape that is not already against the heads. The early 2000s saw the introduction and rise to prominence of high-quality random-access video recording media such as hard disks and flash memory. Since then, videotape has been increasingly relegated to archival and si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chroma Subsampling
Chroma subsampling is the practice of encoding images by implementing less resolution for chroma information than for luma information, taking advantage of the human visual system's lower acuity for color differences than for luminance. It is used in many video and still image encoding schemesboth analog and digitalincluding in JPEG encoding. Rationale Digital signals are often compressed to reduce file size and save transmission time. Since the human visual system is much more sensitive to variations in brightness than color, a video system can be optimized by devoting more bandwidth to the luma component (usually denoted Y'), than to the color difference components Cb and Cr. In compressed images, for example, the 4:2:2 Y'CbCr scheme requires two-thirds the bandwidth of non-subsampled "4:4:4" R'G'B'. This reduction results in almost no visual difference as perceived by the viewer. How subsampling works At normal viewing distances, there is no perceptible loss incurred by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High-definition Video
High-definition video (HD video) is video of higher resolution and quality than standard-definition. While there is no standardized meaning for ''high-definition'', generally any video image with considerably more than 480 vertical scan lines (North America) or 576 vertical lines (Europe) is considered high-definition. 480 scan lines is generally the minimum even though the majority of systems greatly exceed that. Images of standard resolution captured at rates faster than normal (60 frames/second North America, 50 fps Europe), by a high-speed camera may be considered high-definition in some contexts. Some television series shot on high-definition video are made to look as if they have been shot on film, a technique which is often known as filmizing. History The first electronic scanning format, 405 lines, was the first ''high definition'' television system, since the mechanical systems it replaced had far fewer. From 1939, Europe and the US tried 605 and 441 lines until, in 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MPEG-1 Layer 2
MPEG-1 Audio Layer II or MPEG-2 Audio Layer II (MP2, sometimes incorrectly called Musicam or MUSICAM) is a lossy audio compression format defined by ISO/IEC 11172-3 alongside MPEG-1 Audio Layer I and MPEG-1 Audio Layer III (MP3). While MP3 is much more popular for PC and Internet applications, MP2 remains a dominant standard for audio broadcasting. History of development from MP2 to MP3 MUSICAM MPEG-1 Audio Layer 2 encoding was derived from the MUSICAM (''Masking pattern adapted Universal Subband Integrated Coding And Multiplexing'') audio codec, developed by Centre commun d'études de télévision et télécommunications (CCETT), Philips, and the Institut für Rundfunktechnik (IRT) in 1989 as part of the EUREKA 147 pan-European inter-governmental research and development initiative for the development of a system for the broadcasting of audio and data to fixed, portable or mobile receivers (established in 1987). It began as the Digital Audio Broadcast (DAB) project managed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deinterlacing
Deinterlacing is the process of converting interlaced video into a non-interlaced or Progressive scan, progressive form. Interlaced video signals are commonly found in analog television, digital television (HDTV) when in the 1080i format, some DVD titles, and a smaller number of Blu-ray discs. An interlaced video frame consists of two Video field, fields taken in sequence: the first containing all the odd lines of the image, and the second all the even lines. Analog television employed this technique because it allowed for less transmission bandwidth while keeping a high frame rate for smoother and more life-like motion. A non-interlaced (or progressive scan) signal that uses the same bandwidth only updates the display half as often and was found to create a perceived flicker or stutter. CRT-based displays were able to display interlaced video correctly due to their complete analog nature, blending in the alternating lines seamlessly. However, since the early 2000s, displays such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plasma Display
A plasma display panel (PDP) is a type of flat panel display that uses small cells containing plasma: ionized gas that responds to electric fields. Plasma televisions were the first large (over 32 inches diagonal) flat panel displays to be released to the public. Until about 2007, plasma displays were commonly used in large televisions ( and larger). By 2013, they had lost nearly all market share due to competition from low-cost LCDs and more expensive but high-contrast OLED flat-panel displays. Manufacturing of plasma displays for the United States retail market ended in 2014, and manufacturing for the Chinese market ended in 2016. Plasma displays are obsolete, having been superseded in most if not all aspects by OLED displays. General characteristics Plasma displays are bright (1,000 lux or higher for the display module), have a wide color gamut, and can be produced in fairly large sizes—up to diagonally. They had a very low luminance "dark-room" black level compared ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liquid Crystal Display
A liquid-crystal display (LCD) is a flat panel display, flat-panel display or other Electro-optic modulator, electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers. Liquid crystals do not emit light directly but instead use a backlight or reflector (photography), reflector to produce images in color or monochrome monitor, monochrome. LCDs are available to display arbitrary images (as in a general-purpose computer display) or fixed images with low information content, which can be displayed or hidden. For instance: preset words, digits, and seven-segment displays, as in a digital clock, are all good examples of devices with these displays. They use the same basic technology, except that arbitrary images are made from a matrix of small pixels, while other displays have larger elements. LCDs can either be normally on (positive) or off (negative), depending on the polarizer arrangement. For example, a character ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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