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Reprocessing Historical Images, Looking for REALLY big challenges?
tedstryk
post Oct 4 2005, 01:27 AM
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The latest Cassini images of Dione over Saturn remind me of an old Voyager view I am still tinkering with. Here is the best I can do so far. The problem is that available color is O B V UV. I have used OV with a synthetic green from O and V blended with 25% from the B image. Otherwise Saturn looks red due to color shifting. It is also enlarged via super-resolution processing using all four images (which are, unfortunately, underexposed)



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4th rock from th...
post Oct 4 2005, 12:29 PM
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Very good!
The data looks new ;-)


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tedstryk
post Oct 6 2005, 04:36 PM
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QUOTE (4th rock from the sun @ Oct 4 2005, 12:29 PM)
Very good!
The data looks new ;-)
*



Thanks. I do plan to tweak the color a bit...there are a few saturation issues. But my working with Voyager at Saturn images is winding down now with the Cassini release. Here is a view of crescent Mimas with the night side in Saturnshine.



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tedstryk
post Oct 20 2005, 03:21 AM
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This took a lot of work for small returns, but I was curious what could be pulled from this data. These are images of the Uranian moons from the receding Voyager 2. The Miranda image is made from a single, nearly-blank frame, and the rest are from color filtered data (as close to OGV as possible given the horrible quality of the orange data). At any rate, these are the only views of these worlds from this perspective. They are in this order:
Miranda, Ariel, Umbriel, Titania, and Oberion. There are some strange paterns on Titania's limb - particularly the big flat area. It was apparent in all the decent frames used to compose the image.



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Phil Stooke
post Oct 24 2005, 02:46 AM
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Back to Apollo... here's a polar projection of one of the Apollo 17 panoramas at Shorty crater, site of the unexpected discovery of orange solil. The pan itself was assembled first, then its ends matched, which was complicated because the astronaut moved a few steps as it was taken, so the foregrounds did not match very well. There is some serious distortion in that overlap area, but it's reduced in severity in the polar view because the foreground is so compressed.

My Apollo pans are for mapping purposes, so I edit areas of moving astronauts, shadows etc. to maximize surface visibility. This leaves oddly truncated people, equipment and shadows. But it helps my mapping work!

Phil

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Bob Shaw
post Oct 24 2005, 02:00 PM
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Phil:

Interesting perspective - any thoughts on the fuzziness as you leave the central area of the image?

Bob Shaw


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tedstryk
post Oct 24 2005, 02:02 PM
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Great work. I am currently experiencing what are speaking of with pans with moving centers. I have, for the past few months, been trying to assemble a pan (much longer than the one usually released) from Sojourner images. It has proved tricky.


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Phil Stooke
post Oct 24 2005, 04:22 PM
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Bob - the fuzziness is caused by me using a reduced size pan to make the polar projection. I had to make it on a different computer than I usually use and its RAM was too limited to work at high res. Then the geometry of reprojection stretches it out around the centre and makes it fuzzy, while compressing the centre and leaving it sharp.

Or you could get your eyes checked!

Phil


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tedstryk
post Oct 25 2005, 03:10 AM
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Here is my "Dunes Beyond the Rock Garden" pan. It is still a work in progress.



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tedstryk
post Oct 25 2005, 10:53 PM
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Here are two more Sojourner pans. Here is one among the rocks soon after Yogi.



And here is one of the Rock Garden itself.



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tedstryk
post Oct 27 2005, 02:57 AM
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Here is my preliminary version of a color Beyond the Rock Garden pan, using Sojourner color and gapfill based on Sojourner color.



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Phil Stooke
post Oct 27 2005, 03:04 AM
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Very nice, Ted. It's good to see new landscapes in old data like this.

Phil


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paxdan
post Oct 27 2005, 07:34 AM
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i love the shadow of sojourner in the bottom right corner
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tedstryk
post Oct 27 2005, 01:18 PM
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QUOTE (paxdan @ Oct 27 2005, 07:34 AM)
i love the shadow of sojourner in the bottom right corner
*


Thanks...here is a somewhat improved image. I am really strugglign with the left end of the pan.



Here is the raw, left-most segment (well, almost raw - I did put the strips together vertically). As you can see, thanks to glare, the data is just godawful.



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tedstryk
post Oct 27 2005, 03:07 PM
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Here is a polar version of this pan.



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