[X] My Assistant

[tfisher]

I've been playing with the released raw ISS images (thanks to Bjorn for the img2png program!) trying to produce a better image near Huygen's descent location.

Here's what I've come up with. I started with images from two different imaging sequences, applied a Fourier bandpass filter, and stacked the images from the same pass. Because of different lighting conditions, or atmospheric conditions, or something, the images are significantly different, so I combined them as red and blue layers instead of just stacking further. Green is produced by the product of red and blue chanels, and a further contrast adjustment is also made.


I believe Huygens descent location is in the upper left corner. The correspondence with one of Rene's beautiful mosiacs is given here:


Unfortunately the geometry is different enough I can't really overlay the mosaic with the ISS image...

[tfisher]

I've been working on improving my Titan processing methods. I've now got reasonable residual flatfielding and map projection based on the PDS data index information, and thanks to ImageJ's nice macro abilities the process of flattening, sharpening, and map projecting an image is pretty well automated. (which maybe means I should have bitten the bullet and used ISIS, but ah well...)

The "lines" turn out to be fully the result of residual flatfield artifacts, which unfortunately are quite persistant. The "sunrise effect" was a combination of residual flatfield and poor alignment.

I'll share with you the in-progress version of an improved super-resolution stack at the Huygen's landing site (at the moment using the same 5 images from Ta and Tb passes previously mentioned):



A question for volcanopele, if you're reading this: do you know how large the errors in the PDS latitude/longitude info can be? I've been trying to improve slightly on the registration by a small additional translation, but have been hoping error in size or rotation will be negligable.

[elakdawalla]

I've been working on improving my Titan processing methods.  I've now got reasonable residual flatfielding and map projection based on the PDS data index information, and thanks to ImageJ's nice macro abilities the process of flattening, sharpening, and map projecting an image is pretty well automated.  (which maybe means I should have bitten the bullet and used ISIS, but ah well...) 

You are actually using ImageJ for map projection? How??

--Emily