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Image error calculation [message #70287]

Wed, 31 March 2010 19:10

Suguru Amakubo
Messages: 24
Registered: March 2010

Junior Member

Hi I basically have a 400x400 jpg image that I have obtained by
combining 22 similar images. I am currently trying to determine if the
new image produced is better in quality than the original image that I
used as a base.

(With my extremely limited knowledge of images) I have tried to do
this by using the statistic command and looking at the standard
deviation (hence error of image). However I do have an alarming sense
that I am running into a mistake.

Would it be possible if anyone could tell me what IDL procedures or
methods you use to determine 'image quality' quantitatively?

Thanks for your help in advance

Suguru

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Re: Image error calculation [message #70360 is a reply to message #70287]

Thu, 01 April 2010 18:28

Suguru Amakubo
Messages: 24
Registered: March 2010

Junior Member

Thank you all very much for helping me I will definitely experiment
using tiff to see what I could do.

For the time being I will use the root mean square error as
suggested.

Thank you all very much for being helpful.

Regards

Suguru

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Re: Image error calculation [message #70364 is a reply to message #70287]

Thu, 01 April 2010 13:59

Maxwell Peck
Messages: 61
Registered: February 2010

Member

You should definitely listen to the guys above and ignore my
suggestion if you indeed want to show that overall signal to improved
is increased with image stacking. I was really referring to your idea
of blurring/sharpness in the image being a metric - I'm not sure (nor
do I have a lot of knowledge) of whether showing the signal to noise
ratio has improved is enough in and of itself for this purpose.

Max

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