Glossary
Interlaced | A method of image scanning whereby the lines in a single image are divided into two sections |
| or "fields". The signal bandwidth used for interlaced scanning is approximately half that |
| required for progressive scanning when images with the same still picture resolution are |
| broadcast. |
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Offset | The adjustment of minute changes in color that occur as result of factors such as differences |
| in the equipment used to display images. It adjusts the coloration in darker ranges separately |
| for R, G and B components. |
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Refresh Rate | The |
| extremely short time. Because of this, the image must be scanned many times per second in |
| order to refresh the light emitting element. The number of refresh operations per second is |
| called the "refresh rate", and is expressed in hertz (Hz). |
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A video signal which has the luminance component and color component separated in order | |
| to provide better image quality. |
| It refers to images which consist of two independent signals: Y (luminance signal), and C |
| (color signal). |
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SDTV | An abbreviation for Standard Definition Television. It refers to standard television systems |
| which do not satisfy the conditions for |
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sRGB | An international standard for color intervals that was formulated so that colors which are |
| reproduced by video equipment can be handled easily by computer operating systems (OS) |
| and the Internet. |
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SVGA | A type of image signal with a resolution of 800 (horizontal) x 600 (vertical) dots which is |
| used by IBM |
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SXGA | A type of image signal with a resolution of 1280 (horizontal) x 1024 (vertical) dots which is |
| used by IBM |
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Synchronization | The signals output from computers have a specific frequency. If the projector frequency does |
(Sync.) | not match this frequency, the resulting images will not be of a good quality. The process of |
| matching the phases of these signals (the relative position of the crests and troughs in the |
| signal) is called "synchronization". If the signals are not synchronized, problems such as |
| flickering, blurriness and horizontal interference can occur. |
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Tracking | The signals output from computers have a specific frequency. If the projector frequency does |
| not match this frequency, the resulting images will not be of a good quality. The process of |
| matching the frequency of these signals (the number of crests in the signal) is called |
| “tracking”. If tracking is not carried out correctly, wide vertical stripes will appear in the |
| projected images. |
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UXGA | A type of image signal with a resolution of 1600 (horizontal) x 1200 (vertical) dots which is |
| used by IBM |
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VGA | A type of image signal with a resolution of 640 (horizontal) x 480 (vertical) dots which is |
| used by IBM |
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XGA | A type of image signal with a resolution of 1,024 (horizontal) x 768 (vertical) dots which is |
| used by IBM |
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