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AJ
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 Posted: Wed Jul 16, 2008 12:29 pm Post subject: Subjective Image Quality Analysis |
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Hi All,
After some image restoration work (which some people who follow this
group may recall from a previous thread), I have now come to the point
where I need to measure the quality of some restored images. Part of
this analysis has involved using different metrics such as VIF, MSSIM,
PSNR HVSM and PSNR to measure the quality of the restored images.
Now I would also like to conduct a subjective analysis, which is where
YOU can help! :)
I have uploaded a single image containing different results, and I
would be extremely grateful if you would be able to take 30 seconds
out of your time to rate the images in order of visual quality. The
link to the images is http://i287.photobucket.com/albums/ll146/arandall85/image_poll.png
(please don>t forget to use the zoom option on your browser if it
automatically shrinks images to fit... the closer you can see the
images, the more accurate your analysis will be).
Each image is numbered (from 1-5). What I would like is for you to
reply to this thread with your opinion on the order of the images,
from best to worst (where image 1 is the best quality, and image 5 is
the worst).
For example, if I thought the best image was number 2, and the worst
was number 1, I would post something like the following:
2,4,3,5,1.
and also a quick explanation as to why you thought some were better
than others (if you have time!...the results are much more important
than an explanation).
Many thanks in advance,
AJ |
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Industrial One
Guest
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| Posted: Wed Jul 16, 2008 8:07 pm Post subject: Re: Subjective Image Quality Analysis |
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On Jul 16, 6:29 am, AJ <arandal...@gmail.com> wrote:
[quote]Hi All,
After some image restoration work (which some people who follow this
group may recall from a previous thread), I have now come to the point
where I need to measure the quality of some restored images. Part of
this analysis has involved using different metrics such as VIF, MSSIM,
PSNR HVSM and PSNR to measure the quality of the restored images.
Now I would also like to conduct a subjective analysis, which is where
YOU can help! :)
I have uploaded a single image containing different results, and I
would be extremely grateful if you would be able to take 30 seconds
out of your time to rate the images in order of visual quality. The
link to the images ishttp://i287.photobucket.com/albums/ll146/arandall85/image_poll.png
(please don>t forget to use the zoom option on your browser if it
automatically shrinks images to fit... the closer you can see the
images, the more accurate your analysis will be).
Each image is numbered (from 1-5). What I would like is for you to
reply to this thread with your opinion on the order of the images,
from best to worst (where image 1 is the best quality, and image 5 is
the worst).
For example, if I thought the best image was number 2, and the worst
was number 1, I would post something like the following:
2,4,3,5,1.
and also a quick explanation as to why you thought some were better
than others (if you have time!...the results are much more important
than an explanation).
Many thanks in advance,
AJ
[/quote]
2,3 (4,5 are interchangable so I could care less), 1
In 3 I noticed a streak across her cheek hence 2 is better. |
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erpy
Guest
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| Posted: Wed Jul 16, 2008 9:10 pm Post subject: Re: Subjective Image Quality Analysis |
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AJ ha scritto:
[quote]Hi All,
After some image restoration work (which some people who follow this
group may recall from a previous thread), I have now come to the point
where I need to measure the quality of some restored images. Part of
this analysis has involved using different metrics such as VIF, MSSIM,
PSNR HVSM and PSNR to measure the quality of the restored images.
[/quote]
2,3,5,4,1
Best,
E. |
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Thomas Richter
Guest
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| Posted: Wed Jul 16, 2008 11:47 pm Post subject: Re: Subjective Image Quality Analysis |
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AJ schrieb:
[quote]Hi All,
After some image restoration work (which some people who follow this
group may recall from a previous thread), I have now come to the point
where I need to measure the quality of some restored images. Part of
this analysis has involved using different metrics such as VIF, MSSIM,
PSNR HVSM and PSNR to measure the quality of the restored images.
Now I would also like to conduct a subjective analysis, which is where
YOU can help! :)
I have uploaded a single image containing different results, and I
would be extremely grateful if you would be able to take 30 seconds
out of your time to rate the images in order of visual quality. The
link to the images is http://i287.photobucket.com/albums/ll146/arandall85/image_poll.png
(please don>t forget to use the zoom option on your browser if it
automatically shrinks images to fit... the closer you can see the
images, the more accurate your analysis will be).
[/quote]
Without reproducible viewing conditions, it is hard to come to a
valuable result, I afraid. Depending on your monitor and lightning
conditions, personal preference etc, your milage may vary a lot...
So long,
Thomas |
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Sachin Garg
Guest
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| Posted: Thu Jul 17, 2008 12:03 am Post subject: Re: Subjective Image Quality Analysis |
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"erpy" <info@forwardgames.com> wrote in message
news:487e1d70$0$1089$4fafbaef@reader1.news.tin.it...
[quote]AJ ha scritto:
Hi All,
After some image restoration work (which some people who follow this
group may recall from a previous thread), I have now come to the point
where I need to measure the quality of some restored images. Part of
this analysis has involved using different metrics such as VIF, MSSIM,
PSNR HVSM and PSNR to measure the quality of the restored images.
2,3,5,4,1
[/quote]
2,3,4,5,1
I almost picked 3 as first choice but then noticed an (almost) horizontal
dark streak starting from left of the nose in 3, that made me pick 2.
Without that visible artificat, 3 would have won. 4 and 5 look same, too
blury, no added noise/grain.
Sachin Garg [India]
www.sachingarg.com | www.imagecompression.info |
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Marco Al
Guest
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| Posted: Thu Jul 17, 2008 3:25 am Post subject: Re: Subjective Image Quality Analysis |
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AJ wrote:
[quote]and also a quick explanation as to why you thought some were better
than others (if you have time!...the results are much more important
than an explanation).
[/quote]
2,3,4,5,1
Besides what>s already been said, 2 has better deblocking on the eyes.
Marco |
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Industrial One
Guest
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| Posted: Thu Jul 17, 2008 8:43 am Post subject: Re: Subjective Image Quality Analysis |
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On Jul 16, 4:25 pm, Marco Al <m.f...@student.utwente.nl> wrote:
[quote]AJ wrote:
and also a quick explanation as to why you thought some were better
than others (if you have time!...the results are much more important
than an explanation).
2,3,4,5,1
Besides what>s already been said, 2 has better deblocking on the eyes.
Marco
[/quote]
The eyes are the same, dimwad. The focus is her nose+part of the
cheek, all other regions of the pic are the same. |
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Stefano Brocchi
Guest
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| Posted: Thu Jul 17, 2008 9:10 am Post subject: Re: Subjective Image Quality Analysis |
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On Jul 16, 2:29 pm, AJ <arandal...@gmail.com> wrote:
[quote]Hi All,
After some image restoration work (which some people who follow this
group may recall from a previous thread), I have now come to the point
where I need to measure the quality of some restored images. Part of
this analysis has involved using different metrics such as VIF, MSSIM,
PSNR HVSM and PSNR to measure the quality of the restored images.
Now I would also like to conduct a subjective analysis, which is where
YOU can help! :)
I have uploaded a single image containing different results, and I
would be extremely grateful if you would be able to take 30 seconds
out of your time to rate the images in order of visual quality. The
link to the images ishttp://i287.photobucket.com/albums/ll146/arandall85/image_poll.png
(please don>t forget to use the zoom option on your browser if it
automatically shrinks images to fit... the closer you can see the
images, the more accurate your analysis will be).
Each image is numbered (from 1-5). What I would like is for you to
reply to this thread with your opinion on the order of the images,
from best to worst (where image 1 is the best quality, and image 5 is
the worst).
For example, if I thought the best image was number 2, and the worst
was number 1, I would post something like the following:
2,4,3,5,1.
and also a quick explanation as to why you thought some were better
than others (if you have time!...the results are much more important
than an explanation).
Many thanks in advance,
AJ
[/quote]
Hi,
2,3,4,5,1
4 and 5 seem to be visually equal to me. I also see very little
quality difference between 2 and 3
So long,
Stefano |
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