Information about Line Doubler
A line doubler is a device used to deinterlace video signals prior to display.
The main function of a line doubler is to take an interlaced video source which consists of a two-field frame and create a progressive scan (single non-interlaced frame) output. This produces a brighter, smoother high resolution picture. The additional lines provide greater light output and makes for an image that is smoother and more film like. CRT-based displays (both direct-view and projection) are capable of directly displaying both interlaced and progressive video, and therefore the line-doubling process is an optional step to enhance picture quality. Most other types of display, including LCD, plasma and DLP, generally cannot accept an interlaced signal directly, and therefore some kind of line doubler must be used. This is usually built in and transparent to the user. Progressive scan DVD players also feature a line doubler.
The most basic and literal way to double lines is to repeat each scanline, though the results of this are generally very crude. Most line doublers use digital interpolation to recreate the missing lines in an interlaced signal, and the resulting quality depends on the technique used. Generally a line doubler will only interpolate within a single field, rather than merging information from adjacent fields, to preserve the smoothness of motion. Some line doublers are capable of using the former technique in moving areas and the latter in static areas, which improves overall sharpness.
Line doublers have been replaced recently by video scalers which incorporate removal and the ability to scale the image to the various screen resolutions used on LCD, plasma display and DLP projectors and displays.
Digital Light Processing (DLP) is a technology used in projectors and video projectors. It was originally developed at Texas Instruments, in 1987 by Dr. Larry Hornbeck.
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Digital Light Processing (DLP) is a technology used in projectors and video projectors. It was originally developed at Texas Instruments, in 1987 by Dr. Larry Hornbeck.
..... Click the link for more information.
The main function of a line doubler is to take an interlaced video source which consists of a two-field frame and create a progressive scan (single non-interlaced frame) output. This produces a brighter, smoother high resolution picture. The additional lines provide greater light output and makes for an image that is smoother and more film like. CRT-based displays (both direct-view and projection) are capable of directly displaying both interlaced and progressive video, and therefore the line-doubling process is an optional step to enhance picture quality. Most other types of display, including LCD, plasma and DLP, generally cannot accept an interlaced signal directly, and therefore some kind of line doubler must be used. This is usually built in and transparent to the user. Progressive scan DVD players also feature a line doubler.
The most basic and literal way to double lines is to repeat each scanline, though the results of this are generally very crude. Most line doublers use digital interpolation to recreate the missing lines in an interlaced signal, and the resulting quality depends on the technique used. Generally a line doubler will only interpolate within a single field, rather than merging information from adjacent fields, to preserve the smoothness of motion. Some line doublers are capable of using the former technique in moving areas and the latter in static areas, which improves overall sharpness.
Line doublers have been replaced recently by video scalers which incorporate removal and the ability to scale the image to the various screen resolutions used on LCD, plasma display and DLP projectors and displays.
See also
Deinterlacing is the process of converting interlaced video, like common analog television signals, into a non-interlaced form.
Video (or film) consists of a series of images played in succession, each of these images is known as a frame.
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Video (or film) consists of a series of images played in succession, each of these images is known as a frame.
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Video (Latin for "I see", first person singular present, indicative of videre, "to see") is the technology of electronically capturing, recording, processing, storing, transmitting, and reconstructing a sequence of still images representing scenes in motion.
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Progressive or noninterlaced scanning is any method for displaying, storing or transmitting moving images in which all the lines of each frame are drawn in sequence.
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1. Electron guns 2. Electron beams 3. Focusing coils 4. Deflection coils 5. Anode connection 6. Mask for separating beams for red, green, and blue part of displayed image 7.
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liquid crystal display (commonly abbreviated LCD) is a thin, flat display device made up of any number of color or monochrome pixels arrayed in front of a light source or reflector.
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plasma display panel (PDP) is a type of flat panel display now commonly used for large TV displays (typically above 37-inch or 940 mm). Many tiny cells located between two panels of glass hold an inert mixture of noble gases (neon and xenon).
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- For , see .
Digital Light Processing (DLP) is a technology used in projectors and video projectors. It was originally developed at Texas Instruments, in 1987 by Dr. Larry Hornbeck.
..... Click the link for more information.
A video scaler is an algorithmic processing device for converting video signals between one arbitrary resolution/aspect-ratio and another resolution/aspect-ratio. In their most common application they are "upscaling" or "upconverting", taking a low resolution (Standard Definition)
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thin film transistor liquid crystal display (TFT-LCD) is a variant of liquid crystal display (LCD) which uses thin film transistor (TFT) technology to improve image quality. TFT LCD is one type of active matrix LCD, though it is usually synonymous with LCD.
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plasma display panel (PDP) is a type of flat panel display now commonly used for large TV displays (typically above 37-inch or 940 mm). Many tiny cells located between two panels of glass hold an inert mixture of noble gases (neon and xenon).
..... Click the link for more information.
..... Click the link for more information.
- For , see .
Digital Light Processing (DLP) is a technology used in projectors and video projectors. It was originally developed at Texas Instruments, in 1987 by Dr. Larry Hornbeck.
..... Click the link for more information.
Deinterlacing is the process of converting interlaced video, like common analog television signals, into a non-interlaced form.
Video (or film) consists of a series of images played in succession, each of these images is known as a frame.
..... Click the link for more information.
Video (or film) consists of a series of images played in succession, each of these images is known as a frame.
..... Click the link for more information.
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