The Peter Pan, 360 degree colour panorama |
The Peter Pan, 360 degree colour panorama |
Jun 24 2008, 11:18 PM
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Senior Member Group: Moderator Posts: 2262 Joined: 9-February 04 From: Melbourne - Oz Member No.: 16 |
I've been struggling all evening, to manipulate the full size version on my poor old computer.
Now it's getting late, so it'll have to wait. In the meantime here is a lower resolution (about 1/4) first draft. I believe that with this done that is full mission success for SSI. Congrats Mark! James -------------------- |
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Jul 18 2008, 03:42 AM
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
From the HiRISE images it appears that the local terrain around Phoenix has been significantly darkened. I was curious how to correct the view for a "pre-landing" (read pre-retro blast) view.
I used the IRB[=RGB] images hosted on Emily's blog (permalink) to calculate the darkening effect in the local area around Phoenix. I selected two representative areas in the HiRISE images, one near the Phoenix spacecraft (inside the blast zone), the other beyond the obvious blast zone in the false color image. Both areas needed to be fairly uniform (and easy to find) in the images. They correspond to the central section of the smaller polygons. Next, I used the selected zone Histogram function in Photoshop to find the average brightness values (on a 0-256 unit scale) of the pixels inside the representative zones for each channel image. Note that the differences in the I[R] and B[BG] channels are within the standard deviation of the values. Figuring the difference as a function of the measured brightness, I *think* this is how to correct the view of the Phoenix mosaic to the pre-landing colors These numbers are in reference to the HiRISE instrument detector response in the IRB channels, not to the Phoenix imaging camera! To correct the Phoenix surface mosaic to pre-landing colors:
-Mike -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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