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1080i A High Definition video format consisting of 1,080 vertical lines of display resolution in an Interlaced scan. The term usually assumes a widescreen aspect ratio of 16:9, implying a horizontal resolution of 1920 pixels and a frame resolution of 1920×1080 or about 2.07 million pixels.
480i A Standard Definition video format consisting of 480 vertical lines of display resolution in an Interlaced scan. While NTSC has a total of 525 lines, only 480 of these are used to display the image for DV-NTSC.
576i A Standard Definition video format consisting of 576 vertical lines of display resolution in an Interlaced scan. The format is used primarily in PAL and SECAM countries. The field rate (not to be confused with the frame rate), which is 50 Hz, is sometimes included when identifying the video mode - ie, 576i 50.
IEEE 1394 (FireWire) IEEE-1394 is a high speed serial digital interfacing standard used to transfer digital video signals from one piece of equipment to another. The technology was developed by Apple and is also known as FireWire or iLink. It can transmit at data rates of up to 400Mb/s, more than enough to handle MPEG1 or MPEG2 compressed digital bitstreams, and sufficient for some uncompressed digital video formats. Updated versions allow a transfer rate of close to 800Mb/s. A typical IEEE-1394 interface cable may have two shielded TWP cables for bidirectional information transfer, plus two optional additional wires for supply of DC power. This type of cable can convey digital video bitstreams over distances up to about 4.5m.
Interlacing Interlacing is a technique of improving the picture quality of a video signal without consuming extra bandwidth. In an interlaced scan, only half the screen is refreshed at a time. The video signal beam skips every other line, and fills in the missing lines on the next pass. Interlacing uses two fields to create a frame. One field contains all the odd lines in the image, the other contains all the even lines of the image. Interlacing causes a certain amount of visible flicker, but in live video it is hardly noticeable. When interlaced video is watched on a progressive monitor without deinterlacing, it exhibits 'combing' when there is movement between two fields of one frame.
Infrared Touchscreen An infrared touchscreen uses an array of X-Y infrared LED and photodetector pairs around the edges of the screen to detect a disruption in the pattern of LED beams. A major benefit of such a system is that it can detect essentially any input including a finger, gloved finger, stylus or pen. It is generally used in outdoor applications and point-of-sale systems which cannot rely on a conductor (such as a bare finger) to activate the touchscreen. Unlike capacitive touchscreens, infrared touchscreens do not require any patterning on the glass which increases durability and optical clarity of the overall system.
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