Hdmi Upscaling
Hdmi Upscaling
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Comapring DVD upscaling to Blu-ray
With the arrival and popularity of high definition TV sets over the recent decade, there have been many developments made to players trying to fit and utilize the high resolution which HDTV offers. One of these developments was the 'upscaling' capabilities of the standard DVD player, which allowed the DVD player to perform much better with HDTV and produce a superior quality picture.
But now that Blu-ray players are on the scene, how efficient are these 'upscaling' DVD players? Some may get confused as to what to purchase and which device is best? What is the difference between the upscaling of standard DVD and Blu-ray?
The answer all comes down to resolution output.
The everyday, standard DVD player that you can find in most homes has an output video resolution at 480i(720x480), this is without upscaling of course. A progressive scan DVD player can produce an output video resolution of 480p (720x480).
Most HDTV have the capability to display video resolution up to 720p (1280x720) - 1080p (1920x1080). (Remember 1080p is the highest video resolution.) So you can clearly see that just using a standard DVD player you will not get the full benefit of your High Definition TV. What the upscaling DVD feature does is mathematically formats the pixel count of the output to the DVD signal to the pixel count on a High Definition TV. The resulting effects produces a superior picture display better suited to your HDTV.
But while the upscaling method does a very good job upscaling the pixel output of a DVD so that it corresponds to the pixel display resolution of the HDTV, it can not convert a standard DVD pictures into real High Definition pictures. What DVD upscaling mostly accomplishes is smoothing out the edges of the images, but it does not add extra details to them.
Some points to remember:
* 480i: 720 pixels per line which has 480 horizontal lines displayed alternately. In other words Interlaced Scanning where all the odd lines are displayed, then followed by all the even lines.
* 480p: 720 pixels per line which has 480 horizontal lines which uses Progressive Scanning each line displayed following another. Progressive scanning is the better because it produces a smoother video which has a clearer image, especially with fast-moving scenes.
* 720p: 1,280 pixels per line which has 720 horizontal lines – displayed thru Progressive Scanning – each line displayed following another. (720 High Definition TV)
* 1080i: 1,920 pixels per line which has 1,080 horizontal lines – displayed alternately. Interlaced Scanning – all the odd lines are displayed, then followed by all the even lines. (1080i High Definition TV)
* 1080p: 1,920 pixels per line which has 1,080 horizontal lines – displayed progressively. Progressive Scanning – each line displayed following another. (1080p High Definition TV/ Blu-ray Disc)
In conclusion, you can only get high definition images through the use of a Blu-ray player and blu-ray disc. An upscaled DVD will look slightly blandish and balmy compared to a Blu-ray player. When dealing with colors such as reds and blues, the difference is very noticeable. DVD upscaling tend to eliminate details, while in a blu-ray player these details are very sharp and clear. DVD upscaling produces a very good similarity to the High Definition experience, but to truly get the best high definition experience you need to have a Blu-ray player (with a Blu-ray disc) connected to your HDTV via an HDMI cable.
About the Author
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For more information on Blu-ray and Blu-ray Players try this handy comparison guide: Bluray Players Or view our Videos and Blu-ray Player Reviews here: Blu-ray Player Reviews Copyright 2010. This article may be freely distributed if this resource box stays attached.
what is HDMI upscaling?
First, HDMI (See first link) is "High-Definition Multimedia Interface" -- a jack and socket format (See picture at second link) which allows digital transmission of both high definition video and audio over a single cable.
Upscaling is the conversion of a lower resolution video image (e.g. 720x480p) to a higher resolution (e.g. 1280x720p).
All digital displays (vs an analogue CRT) such as a DLP, LCD or LCOS flat panel display or projector have a native resolution (e.g. 1280x720) but, because input can be in a whole host of aspect ratios (ratio of width to height) and resolutions the display (e.g. HDTV, projector) has to be able to convert the input resolution to the native resolution to fill the display screen. This is scaling, and is done by the scaling circuits in the display device (unless done by some form of external device, e.g. an upscaling DVD player, dedicated video scaler) which can feed the display the required native resolution signal. BTW, scaling can be either lower to higher (upscaling) or higher to lower (downscaling), and strictly speaking it must also accomodate frame rate conversion (e,g, 24 fps or 30 fps to 60 fps) ... but let's not go there.
Since displays have to be able to handle both analogue and digital signals (the latter is generally "better" since it eliminates the generation of artifacts from analogue to digital and digital to analogue conversion) both conversion and scaling to fit the input signal to the output required by the display must be done (as appropriate) via composite, S-video, component, DVI or HDMI (and SCART in Europe) connectors.
OK, so finally "HDMI upscaling" is upscaling of a digital input video signal over an HDMI connection. It is arguably the optimum (short of a dedicated -- and expensive -- outboard video scaler) way to process an input signal for a high quality picture.
Hope this help clarify ...
