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An attempt to super resolution imaging
Ant103
post Oct 17 2006, 08:52 AM
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Hi,

Here is a try to super resolution imaging, by using Iris, a software made for astronomical imagery processing.

I took the Sol 984 images and stack and align them to have a better resolution.

Before, I resised all the frames at 200%.

One of the 15 originals raw images :
Attached Image


And the final picture :


The result is a little visible, but, to have better resolution, I need more than 15 pictures (in astronomical processing, we need a thousand pictures extract from an avi film).


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djellison
post Oct 17 2006, 09:00 AM
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Realistically, you need to be using the uncompressed data - not raw JPG's complete with compression artifacts.

The analogy with planetary imaging with a webcam doesn't hold too well. The reason one takes hundreds of images is because within those hundreds there will be perhaps a dozen frames of near perfect 'seing' where just for a moment the column mass of air was not screwing the image quite so much.

With surface-to-surface imaging such as these super-res sequences, that's not the case - every frame you aquire is a 'good' one so you don't need hundreds of images.

What might be interesting is to compare one of these sequences ( given that the early Olympia outcrop super reses from the early 700's is on the PDS now ) - and try it with the JPG's - the RAD's and then compare to the Pancam teams efforts - http://pancam.astro.cornell.edu/pancam_ins...t/superres.html

Doug
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Ant103
post Oct 17 2006, 10:28 AM
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Yes, I know this fact and know the difference between jpl-exploratorium pics and the original calibrated raws.

Here is my try on the Sol 899 images :
Attached Image


You can now compare it to the Cornell SuperRes Project wink.gif. There is a difference isnt'it biggrin.gif ?


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tedstryk
post Oct 17 2006, 10:39 AM
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I have played around with the JPEGs, and yes, super resolution processing does little. But I have worked with some early mission raws, and there is a lot to be gained.


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ugordan
post Oct 17 2006, 10:46 AM
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QUOTE (Ant103 @ Oct 17 2006, 11:28 AM) *
You can now compare it to the Cornell SuperRes Project wink.gif. There is a difference isnt'it biggrin.gif ?

Are you applying any sharpening to the result? These images look pretty sharpened -- maybe an artifact of Iris' processing?


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Ant103
post Oct 17 2006, 10:52 AM
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Yes, I apply a sharpenning to the result and some artefacts appears. These are due to Iris process.


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antoniseb
post Oct 17 2006, 11:41 AM
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With most astronomical images, there is very little change from frame to frame, but in this case you need to be dealing with the changes in the shadows too. That must make a strange distortion on your end product.
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MarkL
post Oct 17 2006, 05:25 PM
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QUOTE (Ant103 @ Oct 17 2006, 08:52 AM) *
Hi,

Here is a try to super resolution imaging,

There's noticeable sharpening in the stacked image Ant. What this type of stacking does is improve signal to noise and seems to have done that in Ant's version.
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