quality metric PSNR??
I am a bit confused regarding the use of PSNR... Is it absolutely a
blunder to compare an original image and its 2D DCT compressed-
decompressed version using this metric PSNR?? Can any one give me some
appropriate values for PSNR in this case? I want to know if this kind
of comparison based on PSNR value is really outdted????
waiting for ur reply,
PSNR is a standard way of measuring the quality of
compressed images. It is absolutely not outdated! Even
papers on JPEG 2000, if you have seen them, compare
baseline JPEG and JPEG 2000 on the basis of PSNR vs
bits/pixel values. (well, JPEG 2000 isnt recent
anymore, but you get the idea)
PSNR = 10*log10 (255^2/MSE)
where original image is assumed to be use 8 bits per
pixel (hence 'peak' = 255).
Usually PSNR of more than 35 dB is considered good
If you are dealing with colored images, you would work
with the Y,U,V components separately and quote either
the average PSNR in dB or the three PSNR values
separately (psnrY, psnrU, psnrV) to indicate the
quality of the compressed image.
hope this helps to some extent.
"I was born not knowing and have had only a little
time to change that here and there." - Richard Feynman --- rukmanimohan04 <rukmanimohan04@rukm...> wrote:
> I am a bit confused regarding the use of PSNR... Is
> it absolutely a
> blunder to compare an original image and its 2D DCT
> decompressed version using this metric PSNR?? Can
> any one give me some
> appropriate values for PSNR in this case? I want to
> know if this kind
> of comparison based on PSNR value is really
> waiting for ur reply,
> rukmani >
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