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MOM archival data
avisolo
post Oct 6 2016, 06:13 AM
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Here's my version:
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Sean
post Oct 6 2016, 08:24 AM
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Yes I have the same problem with Chrome... a prominent green infecting all images, other browsers are fine. My Flickr timeline looks like Mars has been successfully terraformed.

QUOTE (jccwrt @ Oct 6 2016, 12:28 AM) *
There might be something up with the color profiles - they display fine in Photoshop and Microsoft Photos, but then I get some green color banding when I view them in Chrome. Any ideas?



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ugordan
post Oct 6 2016, 04:21 PM
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QUOTE (elakdawalla @ Oct 5 2016, 03:09 AM) *
I need to do more work to match the Mars colors, I know.

Are you using the MCC_MRC 16 bit or MCC_MRD 32 bit products? The MRDs are supposed to be radiometrically calibrated products, while the MRC are only the detector readout DNs. The former *theoretically* shouldn't produce brightness variations.


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elakdawalla
post Oct 6 2016, 06:38 PM
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I haven't successfully opened the 32-bit data -- IMG2PNG doesn't open it and when I try it in Photoshop, it's all saturated. So I've been working with the 16-bit images.


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elakdawalla
post Oct 6 2016, 11:46 PM
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OK, the entire dataset is now available here. I zipped every image to save on bandwidth consumption. Blog entry about it here.

I downloaded the "level 3" data, which is demosaicked and allegedly calibrated.

I'm very curious to find out if different demosaicking methods produce sharper results. Here is one image (the global view with the Tharsis montes and Valles Marineris), in its raw format, and here is its label. Can any of you do better than the mission's version, which used bilinear interpolation for demosaicking?


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Bjorn Jonsson
post Oct 8 2016, 01:43 AM
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QUOTE (elakdawalla @ Oct 6 2016, 11:46 PM) *
Can any of you do better than the mission's version, which used bilinear interpolation for demosaicking?

Somewhat disappointingly, this comparison seems to be difficult or impossible since inspection of the images reveals that the official images (both the 16 and 32 bit versions) have also had additional processing applied to them. In particular, they have been smoothed, possibly flatfielded and I suspect the brightness may have been adjusted with a (slightly) nonlinear stretch.

Here is a crop showing a comparison between the official version (top) and a version I did using IMG2PNG to output a debayered image using adaptive smooth hue (bottom) for demosaicking.

Attached Image


Attached Image


The bottom version looks sharper but it's also a lot more noisy. This is especially clear if the images are sharpened.

I will be releasing a new version of IMG2PNG that handles these images properly tomorrow (Saturday).
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elakdawalla
post Oct 10 2016, 07:37 PM
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Given Bjorn's observations above, I thought it would be valuable to go ahead and download all of the raw (undebayered) data. I've now done this and posted all the raw images to the MCC page. I'm working on running it through the new version of IMG2PNG.


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