In image processing, “artifact” refers to any predictable flaw in the image that results from shortcuts or shortcomings in the processing technology. In HDTV, most artifacts result from compromises that have to be made when the picture changes too rapidly and requires more than the allowed bandwidth (data rate). Sometimes the choice is to delete frames, while other times the choice is to randomly delete 16x16 macro-blocks. There are a number of common artifacts that result from converting 24 frames/sec films to 30 frames/sec TV. Your particular TV model might introduce some more artifacts.
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mark Alford (Login markalford) Magazine Subscribers
to Ken
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August 4 2003, 2:36 PM
Ken,
Your post gives me an opportunity to ask a question that has been on my mind....Is there any information available that lists the various digital artifacts and perhaps even show an example of them.
Mark
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Having been in the TV business I am familiar with some common artifacts, but it seems to me that this sort of information would be both useful and educational to both serious hobbyists as well as some TV viewers.
Mark
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An artifact is anything that is removed or added to the original image.
All TV's have artifacts. If you are videophile then it is recommended you work with an ISF calibrator/dealer for product selection service. We are here to make it easy and as accurate as possible for your budget.
Richard F. Fisher
Mastertech Repair Corporation, Lawrenceville, GA
770-513-3987 E-Mail - help@mastertechtv.com
Have you been calibrated? ISF and HAA Trained
Factory Authorized
Mitsubishi, Hitachi, Toshiba, Harman Kardon, Infinity, JBL, NAD
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I think “artifact” is an example of presently evolving language. I never hear the term used to describe flaws caused by noise. I constantly hear it used to describe flaw categories where noise is pointedly excluded. I can find no dictionary that supports this distinction, yet I believe it is significant. I see no need for another word for flaw. Flaw is a perfectly good word.
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>> I never hear the term used to describe flaws caused by noise.
Nor do I hear it applied to low light output or narrow viewing angles. These are flaws/limitations to me, but since, as Richard noted, they are not “…removed or added to the original image…”, they are not artifacts. They’re just characteristics (or design related compromises) of some kinds of displays.
Re: Diction
Calibrators must walk a thin line. If you do repair, you’re often an agent of the manufacturers, so it’s difficult to say, as a repair shop/calibrator, that the product is flawed. “Reduced artifacts” sounds a lot less confrontational than “corrected flaws.”
a
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>> Is there any information available that lists the
>> various digital artifacts and perhaps even show an
>> example of them.
With all of the experts here and all of the opinions about "artifacts" expressed, I'd hoped there would be more specific examples cited. For all those who criticize image quality, please jump in with descriptions/examples here; it;s a great opportunity to help many learn.
a
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I would love nothing more than to do a complete course in artifacts. The real question is who would pay money for such an education. Putting this together would be VERY demanding requiring some sort of financial compensation.
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I’ll throw in a link: http://dvd.ign.com/articles/355/355062p1.html
This site, again, DVD oriented, provides examples of Compression Artifacts (aliasing, blotching and pixilation) and Edge Enhancement.
ToddK
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