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Perceptually lossless (talking head) video compression at 22kbit/s

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Re: Perceptually lossless (talking head) video compression at 22kbit/s

#71
post #59

This is very impressive, but “perceptually lossless” isn’t a thing and doesn’t make sense. It means “lossy”.

Can you propose a better term for the concept then? Perceiving something as lossless is a real world metric that has a proper use case. "Perceptually lossless" does not try to imply that it is not lossy.

The term for this is "transparency." A codec is "transparent" if people can't tell the difference between the original and the compressed version.

Re: Perceptually lossless (talking head) video compression at 22kbit/s

#73

This is very impressive, but “perceptually lossless” isn’t a thing and doesn’t make sense. It means “lossy”.

As there are several patents, published studies, IEEE papers and thousands of google results for the term, I think it's safe to say that many people do not agree with your interpretation of the term.

"As a rule, strong feelings about issues do not emerge from deep understanding." -Sloman and Fernbach

Re: Perceptually lossless (talking head) video compression at 22kbit/s

#75
post #59

Earlier quoted context omitted.

Can you propose a better term for the concept then? Perceiving something as lossless is a real world metric that has a proper use case. "Perceptually lossless" does not try to imply that it is not lossy.

The term for this is "transparency." A codec is "transparent" if people can't tell the difference between the original and the compressed version.

"Transparency" is a fairly annoying term for this in image/video because of the obvious polysemy.

Re: Perceptually lossless (talking head) video compression at 22kbit/s

#77

This is very impressive, but “perceptually lossless” isn’t a thing and doesn’t make sense. It means “lossy”.

It means what it already says for itself, and does not need correcting into incorrectness.

"no perceived loss" is a perfectly internally consistent and sensible concept and is actually orthogonal to whether it's actually lossless or lossy.

For instance an actually lossless block of data could be perceptually lossy if displayed the wrong way.

In fact, even actual lossless data is always actually lossy, and only ever "perceptually lossless", and there is no such thing as actually lossless, because anything digital is always only a lossy approximation of anything analog. There is loss both at the ADC and at the DAC stage.

If you want to criticize a term for being nonsense misleading dishonest bullshit, then I guess "lossless" is that term, since it never existed and never can exist.

Re: Perceptually lossless (talking head) video compression at 22kbit/s

#78

“Perceptually lossless” is an oxymoron.

As there are several patents, published studies, IEEE papers and thousands of google results for the term, I think it's safe to say that many people do not agree with your interpretation of the term.

Re: Perceptually lossless (talking head) video compression at 22kbit/s

#79
post #64

Earlier quoted context omitted.

And also it was a deep fake. BTW This is the best sci-fi book ever.

Might be better if you like space opera style really soft science fiction. I really didn’t enjoy it.

The softness is deceptive. Hard concepts about communication and different types of brains are essential to the plot.

Re: Perceptually lossless (talking head) video compression at 22kbit/s

#80
post #64

Earlier quoted context omitted.

Might be better if you like space opera style really soft science fiction. I really didn’t enjoy it.

Fascinating. Vinge is about the furthest from “soft” sci-fi I can think of. We must have very different definitions of what makes something soft. It’s certainly true that Vinge doesn’t spend much time on the engineering details, but I find him unusually clear on “imagine if we had this kind of impossible-now technology, but the rest of what we know about physics remained, how would people behave?” He was, after all,…

>He was, after all, a physics professor.

Actually, he was a mathematics and computer science teacher at San Diego State University.

https://en.wikipedia.org/wiki/Vernor_Vinge

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