[opendtv] Re: [oldvtrs] So Much for HDTV]



Craig Birkmaier wrote:
> I never see blocking artifacts in h.264 video from Apple, and the bit
> rates are typically much lower than what is available for OTA. But most
> of this stuff is 24P and low motion.

That may be just because the in-loop filters and deblocking are built into H264 so you get more softness instead of blocks during bit starvation.

Though that is probably preferable.

- Tom

At 9:21 PM -0400 8/21/08, John Shutt wrote:
----- Original Message ----- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>

That's been done already, at least in a first generation product, by
Algolith. And certainly, this sort of solution makes a lot of sense
*given that* we have MPEG-2 deployed now, all over the DTV world.

Algolith makes Broadcast gear, not consumer decoders, and I cannot find any documentation that their "BAR" Block Artifact Reducer technology is used in any consumer gear. Their noise reduction cards that include BAR operate in the SD-SDI and HD-SDI domains, post MPEG decoding.

What I am referring to should be easily implementable into every consumer MPEG-2 decoder chipset used in STBs, DVD players, and Digital Televisions. Fading to Macroblocks should be a thing of the past.


let's not get cazrried away here. Deblocking is a small bandaid that only marginally improves the picture if you use simple techniques like blending the edges. Think of it like looking through a mosaic shower door; instead of sharp edges on the blocks you get a quilted appearance because all of the real detail in the image is gone. You need some motion compensated prediction to add back detail to significantly improve the picture.

The answer is not band aids. The answer is stop the bit starving!

I never see blocking artifacts in h.264 video from Apple, and the bit rates are typically much lower than what is available for OTA. But most of this stuff is 24P and low motion.

Regards
Craig


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Tom Barry                  trbarry@xxxxxxxxxxx  



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