[opendtv] De-interlacing with HQV high quality video processing (was: 1080i vrs 720P)
- From: Jeroen Stessen <jeroen.stessen@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Wed, 5 Oct 2005 10:45:53 +0200
Hello,=20
Craig wrote:=20
> The problem comes when you add the additional complexity required to=20
> deal with interlaced formats. This requires not on image scaling=20
> capabilities, but sophisticated de-interlacing capabilities. Even=20
> standards converters that cost more than six figures cannot do a good=20
> job with de-interlacing, as it is impossible to properly predict the=20
> information that was not sampled in the first place. It's even worse=20
> when you have to rely on a $10-20 chip in the decoder/display to do=20
> the de-interlacing.
Here's an expert opinion that seems to differ from yours:=20
http://www.videsignline.com/showArticle.jhtml?articleID=3D171201964
and this is an excellent article to explain a lot of the basics !=20
<quote>
Silicon Optix HQV Approach (Pixel-Based Motion Adaptive):
HQV processing represents the most advanced de-interlacing technique=20
available: a true pixel-based motion-adaptive approach. With HQV=20
processing,=20
motion is identified at the pixel level rather than the frame level. While =
it is mathematically impossible to avoid discarding pixels in motion=20
during=20
de-interlacing, HQV processing is careful to discard only the pixels that=20
would cause combing artifacts. Everything else is displayed with full=20
resolution. Only the pixels that would cause combing are removed.=20
Pixel-based motion-adaptive de-interlacing avoids artifacts in moving=20
objects and preserves full resolution of non-moving portions of the screen =
even if neighboring pixels are in motion.
?Second Stage? Diagonal Interpolation
To recover some of the detail lost in the areas in motion, HQV processing=20
implements a multi-direction diagonal filter that reconstructs some of the =
lost data at the edges of moving objects, filtering out any ?jaggies.?=20
This=20
operation is called ?second-stage? diagonal interpolation because it?s=20
performed after the deinterlacing, which is the first stage of processing. =
Since diagonal interpolation is independent of the de-interlacing process, =
competitors have used similar algorithms with their frame-based de-
interlacing approaches.=20
<unquote>
Maybe if you'd first start spending those $20 on a decent chip... ! ;-)=20
Best regards,=20
-- Jeroen
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