Re: Compression and PSNR

Hi,

> Even i thought of making one of those (compression or pnsr) equal for
> both cases but as it turns out that it is extremely difficult to do
> that. Getting same bpp from two very complex mechanism is not uder
> users control. I mean in mpeg, the most we can do is to change the
> factor by which we scale the quantization matrices, and beyond that,
> one cannot be assured to get any fixed value in bpp.

But what you *can* do is to measure the rate/distortion curve of
both codecs, even though the sample points are not identical. You should
be able to interpolate between the two, at least graphically:
Plot PSRN against BPP and compare the plots.

> I agree visual tests are the best but for thinsg like publication,
> saying that 1000 people tested my scheme and found its results more
> plausible than MPEG does not sound that convincing. Right?

If you really got 1000 people, and you setup the test correctly
(i.e. you haven't tried to bribe them ;-) then this sounds pretty
much convincing to me.

So long,
Thomas
.