Da Man
join:2008-05-08
Hanover, PA | Re: Our way or the highway Because requiring 18Mbps for 1080i to qualify as HD is patentable. | |
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james
join:2001-02-26
antarctica
| Re: Our way or the highway He made a good point, you on the other hand are just being a smart ass. Perhaps 18Mbps being required for 1080i would cause a company who has been working on a superior compression technique to not support the new standard? Perhaps the new standard that is being negotiated would define MORE than how much bandwidth is to be used for a given resolution. | |
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sporkme
drop the crantini and move it, sister
Premium,MVM
join:2000-07-01
Morristown, NJ
 ·Optimum Online
| Re: Our way or the highway said by MxxCon  :The problem with such rule is there is no standard measurable unit of image "quality". There certainly good be though. Take the original, zoom in to some number of pixels. Do the same on the compressed version. Count how many pixels are different.
You can do this experiment at home. Take a high quality jpg. Save it with really crappy compression settings. Open up both. Zoom in to a complex area of the image. Count the pixels that are different. | |
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| | EPS
join:2008-02-13
Hingham, MA | Re: Our way or the highway But what is "different"? If a shade of red is slightly changed, is that equal to the shade of red getting blurred into gray? | |
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Dogfather
Premium
join:2007-12-26
Laguna Hills, CA | Re: Our way or the highway That is part of what a standard would determine...at what point are they considered different. | |
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| PDXPLT
join:2003-12-04
Banks, OR
1 edit | said by MxxCon :The problem with such rule is there is no standard measurable unit of image "quality" Not true.
There are ITU and MPEG standards for making objective measurements that correlate to perceived image quality.
And as for other "HDTV standards", there are whole volumes of ATSC and MPEG standards for modulation, coding, and transmission of HDTV signals.
The title of this article is the problem. There are plenty of HDTV standards, including those for objective quality measurement.
What there aren't any of are HDTV quality regulations. There's no law that that states what image quality providers must broadbast, other than an ambiguous one that says at least one prgram equivalent to NTSC quality must be provided.
Broadcasters, cable MSO's, and DBS providers believe most consumers don't know and don't care about pciture quality. They're probably right; how many TV's are horribly misadjusted? Most of them. The providers believe they'll be more profitable providing quantity over quality. So they pack in as many overcompressed channels as they can.
The one place you may get relief from this is Blu-Ray. There is no economic incentive to compress more than what is necessary to fit on the disk. And the folks controlling the compression are the same who produced the film, and have an interest in having its quality preserved and displayed. | |
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