Video electronics are capable of capturing, recording, processing, transmitting, and reconstructing moving pictures. As digital products have been improved in processing power, display capability, and storage capacity, various video equipments have been developed and spreaded rapidly throughout the market. Digital video disk players (DVD), digital video recorders (DVR), laser disc players, video cassette recorders (VCR), and televisions are the standard entertainment equipment for general households. Those video products use display technologies such as cathode ray tubes (CRT), liquid crystal displays (LCD), polymer dispersion liquid crystals (PDLC), and plasma display panels (PDP). Televisions have existed for a long history and are now in much advanced fabrications and performances. Currently commercially available TV products include flat panel televisions, projection televisions, and portable televisions. DVD players and recorders allow the user to playback the disc contents using one of a plurality of playmodes. Video signal processing systems provide consumers a vast number of options for controlling playback of a video title stored on such a media. Video systems are also widely used in business, manufacturing, automobile, and various other industrial applications for process control, communications, observation and surveillance. Closed circuit televisions (CCTV) are used in factories, office buildings, hotels, educational institutions for surveillance and security purposes. Video surveillance systems often monitor relatively large areas by means of several video cameras or domes.
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Saturday, 13 January 2007 |
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Set-top boxes are used to control the conversion of the media signal transmitted from a content provider into the images and sounds that are provided by a corresponding media display device. Television set-top boxes provide tuning capabilities for cable and satellite television systems. Typically, a set top box connects to a television set and interfaces various media such as cable television broadcasts, satellite signals, stereo components, internet connections via a telephone line, DVD and VCR devices. Digital broadcast systems include direct broadcast digital satellite systems, interactive internet access systems, and digital cable systems. A digital set top box may be used as an interface between the digital broadcast systems and a television set, computer or other remote user terminals. |
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Sunday, 07 January 2007 |
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Medical imaging is one of the most demanding applications of radiographic imaging. In a medical imaging system, the medical modality may include a diagnostic modality, such as a magnetic resonance (MR), computed tomography (CT), positron emission tomography (PET) system, conventional radiography (X-ray), direct radiography (DR) or ultrasound imaging device. CT systems function by irradiating a patient with X-rays and recording the images generated thereby. An X-ray system comprises a x-ray source, the rays from which are partially absorbed by the object being imaged, and a x-ray detector. An ultrasound imaging system scans a human body with ultrasound beams to create two-dimensional images of organs such as the heart, a fetus, the liver, or blood vessels. |
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Tuesday, 19 December 2006 |
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Digital television is becoming increasingly popular in the world. Compared with conventional analog broadcasting, the digital broadcasting is characterized in that broadcasting of higher video quality and higher audio quality can be done in the same frequency band. A digital TV broadcasting system in general uses a terrestrial VSB (vestigial side band) transmission system. Digital television receivers include an antenna, a tuner, a demodulator and a decoder coupled to a display. The digital TV decoder typically has an MPEG video decoder, a unit for outputting decoded video data, and an on screen display (OSD) unit. The decoder processes a bit stream corresponding to each class inclusive of discrete cosine transform (DCT) coefficients and motion vector information. |
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Thursday, 14 December 2006 |
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Magnetic resonance imaging (MRI) is a non-invasive imaging technique that can produce high resolution, high contrast images of the interior of the human body. Magnetic resonance imaging systems generate medical diagnostic images by measuring faint radio frequency signals emitted from atomic nuclei of tissue in the presence of a strong magnetic field after radio frequency stimulation. An MRI system comprises a superconducting magnet, a gradient coil assembly, a variety of RF resonators, and a computer to control overall MRI system operation and create images from the signal information obtained. The generation of nuclear magnetic resonance (NMR) signal for MRI data acquisition is achieved by exciting the magnetic moments with a uniform RF magnetic field. |
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Thursday, 07 December 2006 |
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High-definition television (HDTV) is a digital television format which provides approximately twice the vertical and horizontal resolution of existing television standards. A HDTV displays a highly finely defined television picture on a wide screen having a large display area so as to provide novel attractive features which cannot be exhibited by the current conventional television broadcasting. MPEG video data is used to support HDTV wherein the video frames are of higher resolution than those used in NTSC signals. MPEG-2 standard defines a complex syntax which contains a mixture of data and control information. A HDTV receiver receives an HDTV broadcast so that a user can view the broadcast. HDTV is especially advantageous for use in wide screen theater and home TV projection. |
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Thursday, 23 November 2006 |
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Video games have become extremely popular since they were first introduced. Most video game consoles have a slot for receiving a video game cartridge. To operate the video game system, a player inserts a game program which may be stored in a game cartridge into the console and typically depresses a start switch to begin play of the particular game programmed into the cartridge. As a game is played, a player or players control various visual aspects of the game using either the hard-wired or wireless controllers. Video game systems used in the home are basically simple computers that use joysticks, paddles and other devices for input, and the television screen for output. Arcade video games integrate electronic and mechanical devices designed to make arcade video games more interactive. |
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Wednesday, 15 November 2006 |
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Modern automotive vehicles incorporate an ever-increasing electronic devices. Among the car video devices are TV tuners, DVD (digital versatile disc) players, and car navigation systems. Passenger vehicles have television sets for viewing while riding in the passenger vehicle. These video display units are often interconnected to recording and playback devices, such as video cassette recorders and digital video disc units, so that occupants of the passenger vehicle may enjoy movies and other prerecorded programs as well as live television broadcasts. Video display screens are used in vehicles for providing information to the driver or entertainment to the passengers. Video screens used with navigation systems are typically mounted on the dashboard for providing GPS data to the driver. |
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Saturday, 11 November 2006 |
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Video switching apparatus called a frame switcher or a multiplexer is used for inputting a plurality of video signals and dividing per channel the signal in time units such as frames and fields to multiplex the signals and outputting the signals to video recording apparatus. Video input sources provide picture images for input to a video switcher which then switches to the output for transmission or recording one of the picture images from a selected one of the input sources. The switching is done by programming the switcher to perform several transitions automatically in a specific sequence with a predetermined type of transition. A video switcher includes at least one and usually multiple multi-level effects amplifiers or mixers, each capable of mixing two or more video inputs to create a single video output signal. |
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Wednesday, 25 October 2006 |
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A home theater system reproduces the impact and sense of movie-like reality and the sensation of a movie theater. A modern home theater system may comprise a large screen television or display, a stereo receiver, a VCR, a cable decoder, a DVD system, a high power audio amplifier unit, cassette or CD players, and several speaker systems. The quality of sound and video experienced in home entertainment systems is mostly determined by the quality of the components in the final stage of the signal path: the speakers and the display devices. Most home theater systems are equipped with image projectors to display a movie in a home theater environment. Projectors for home theaters are typically liquid crystal projectors, and digital light processing (DLP) projector that uses a digital mirror device. |
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Wednesday, 18 October 2006 |
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Video conferencing systems are being used in a wide variety of settings to enable effective communication among participants at different geographical sites. With a video conferencing system, audio and video signals are transmitted over a communication link to be reproduced at a remote video conferencing system.Video conferencing system generally includes a local station and a remote station, also known as endpoints. Each video conferencing location includes a video conference processor, a video camera, a display, a microphone, and a speaker. A multipoint video conferencing system includes a multipoint control unit (MCU) which receives video signals from several different users and provides a single output video signal which can be simultaneously displayed to all participants. |
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Sunday, 08 October 2006 |
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Video editing systems are used to combine selected video scenes into a desired sequence. A video editor communicates with and synchronizes one or more video tape recorders and peripheral devices to allow editing accurate within a single video field or frame. Nonlinear video editing systems allow a user to join, manipulate or modify digital or digitized information to create a finished work for rendering to an appropriate storage media. Nonlinear editing on computer oriented systems involves digitizing analog media data recorded from a linear source. In linear video editing, the images are taken in a sequential order. Most video editing programs assemble clips in a storyboard that looks like a picture book, with the clips in sequence. Different types of video editing techniques currently exist. |
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Thursday, 21 September 2006 |
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Machine vision technology deals with the automated analysis of an image to determine characteristics of objects and other features shown in the image. A machine vision system provides automated, computer-based image processing capabilities that can be customized for various vision tasks. Machine vision systems acquire images of an environment, process the images to detect objects and features in the images and then analyze the processed images to determine characteristics of objects and other features detected in the images. In machine vision, image enhancement techniques are used to process image data to facilitate operator and automated analysis. Machine vision systems are increasingly employed to replace human vision in a wide range of processes such as manufacturing operations. |
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Wednesday, 13 September 2006 |
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A plasma display device is a display device in which a voltage is applied to discharge cells containing a discharge gas consisting of a rare gas sealed in discharge spaces, and phosphor layers in the discharge are excited by UV rays generated based on glow discharge in the discharge gas, thereby achieving emission of light. Plasma display panels (PDP) are widely used for flat TV screens. A plasma display panel can be structurally grouped into a direct current (DC) type panel in which electrodes are exposed to discharge gas, and an alternate current (AC) type panel in which electrodes are covered with a dielectric film, and are not exposed to discharge gas. lasma display panels offer the advantages of thin structure, freedom from flicker, a high display contrast ratio, and rapid response speed. |
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Saturday, 02 September 2006 |
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Digital video recorders (DVRs), also sometimes called personal video recorders (PVRs), are digitally based devices that enable a viewer of television to receive and digitally record video programming. Digital video recorders offer programming access and recording functions. DVRs enable a viewer to record defined categories of live television programming over the course of days. Digital video tape recorders use compression techniques to record images. MPEG is a standard for digitally encoding moving pictures and interleaved audio signals. Digital video recorders can receive either a streaming analog signal in an uncompressed format or a digitally encoded signal from a transmission source. Digital video recorders typically store video programs on a random access storage device. |
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Tuesday, 29 August 2006 |
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The television industry is beginning to use flat panel displays to replace cathode ray tube (CRT) technologies. The cathode ray tubes also have major drawbacks such as excessive bulk and weight, fragility, high power and voltage requirements. A flat panel display is lighter and smaller than a CRT display and has a low power consumption. Because of their light weight, small footprint, relatively sharp resolution, and low power consumption, flat panel displays enjoy wide appeal as television screens, electronic game displays, computer screens, avionics or vehicular displays. A liquid crystal display has characteristics of being thin and light-weight, and low power consumption. The liquid display devices provide richer and fuller colors and higher resolutions as compared with conventional display devices. |
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Tuesday, 15 August 2006 |
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A video cassette recorder (VCR) is a device for recording and reproducing a video signal and an audio signal recorded on a recording medium. A video cassette recorder can record image and audio signs onto a magnetic tape and reproduce the signals from the magnetic tape on which the signals are recorded. The video cassette recorder can reproduce the recorded video signal at a normal, low or high speed, or can stop reproducing the signal. A video cassette recorder generally includes a base, a running system installed on the base for drawing out a magnetic tape from a cartridge and for running the magnetic tape along a predetermined path, and a head drum assembly for recording and reproducing video signals on and from the magnetic tape. The head drum assembly is used for recording the video signals onto the tape and for reproducing the video signals from the tape on which the signals are recorded. |
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Video Equipment
