Huygens Flat-fielded MRI images
Rene Pascal has posted online a zip file contain all non-duplicated medium resolution imager frames from DISR taken during Huygens descent in January. Each image has been flat-field, a image-processing procedure where camera and/or CCD defects are removed from an image by ratioing the image with an image that contains just the defects. Rene created that file by summing several bland MRI images together to produce an average bland file. This bland file thus contains only the defects and no contrast due to surface features. This procedure produces far cleaner and scientifically useful images than the raw images that were released.
posted by Jason Perry at 1:44 PM
3 Comments:
Indeed, Rene has done a great job processing these relatively difficult data set. With flatfielding, many of the higher altitude images can be more accurately contrast enhanced.
In terms of the post-lamp HRI images, it does indeed look like many of them are a wash out due to the back scattering of the haze. While it is an unfortunate result for surface science, given that in the last 100 meters, Huygens flew over a 5 meter tall cliff, but it definitively shows that the haze extends all the way to the surface.
Impressive processing, the site also contains the best Huygens mosaic i've seen yet. Any more info on the 5m cliff, this is the first i've heard of it.
The Sonar experiment on the SSP instrument on Huygens detected at double ech oin the last 100 meters before landing. The shape and intensity of this double peak, and its evolution from 100 meters alitude to the ground, is consistent with Huygens having flown over a 5 meter tall cliff.
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