Exploring Gediz Vallis and its ridge, Sols 3871-xxxx, 1 Jul 2023- |
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Exploring Gediz Vallis and its ridge, Sols 3871-xxxx, 1 Jul 2023- |
 Jun 1 2024, 12:43 PM
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#556
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Senior Member  Group: Members Posts: 2837 Joined: 22-April 05 From: Ridderkerk, Netherlands Member No.: 353  |
The Navcam R view on Sol 4200.
Jan van Driel
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Jun 1 2024, 04:59 PM
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#557
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 Senior Member Group: Members Posts: 1643 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
Animation between Sols 4193 and 4197 using official mosaics. Charting a new course to the west and moving further into the channel.
Longer steppable drive animation with a combination of official and Jan's mosaics from Sol 3435 up to the present. -------------------- Steve [ my home page and planetary maps page ]
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Today, 12:42 AM
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#558
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 Senior Member Group: Members Posts: 4250 Joined: 17-January 05 Member No.: 152 |
The accuracy of the colours here isn't very certain, but I don't recall anything showing up this vivid a shade of green with these cameras before:
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Today, 01:33 AM
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#559
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Member Group: Members Posts: 911 Joined: 4-September 06 From: Boston Member No.: 1102 |
Did a wheel go over this? Any one want to speculate as to what mineral would have this appearance?
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Today, 02:00 AM
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#560
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Senior Member Group: Members Posts: 4250 Joined: 17-January 05 Member No.: 152 |
Yes, they drove over it and cracked it open. You can see it on the left of this navcam frame:
https://mars.nasa.gov/msl-raw-images/proj/m...NCAM00200M_.JPG |
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Today, 07:13 PM
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#561
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 Member Group: Members Posts: 811 Joined: 3-June 04 From: Brittany, France Member No.: 79 |
QUOTE (fredk @ Jun 3 2024, 01:42 AM)  The accuracy of the colours here isn't very certain, but I don't recall anything showing up this vivid a shade of green with these cameras before: I think part of the green tint is due to debayering artifacts. Here is what I obtain after removing them.  Here is also the MC100 context mosaic of the workspace.  -------------------- |
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Today, 08:30 PM
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#562
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Senior Member Group: Members Posts: 4250 Joined: 17-January 05 Member No.: 152 |
QUOTE (neo56 @ Jun 3 2024, 08:13 PM) I think part of the green tint is due to debayering artifacts. Here is what I obtain after removing them. It's common to see green blocks when doing a simple deBayering. But they appear on smooth areas, where the jpeg compression algorithm is tricked into compressing too much. I don't recall green artifacts on irregular areas before. Also the green deBayering artifacts follow the 8x8 pixel DCT jpeg block pattern, which these greenish areas don't. How do you remove the green blocks - is it possible you've removed too much green? The overall colour balance may be off somewhat in my image. And there certainly might be something about the rock here that causes some new type of artifact - we may have to wait to see colour images from the original data to know for sure. |
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Today, 09:56 PM
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#563
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Senior Member Group: Members Posts: 1045 Joined: 17-February 09 Member No.: 4605 |
Being Mars, the automatic reaction is that it's calcium sulphate.
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