[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...

[Phil Stooke]

tfisher - I hate to say it but I can't see any linear features at all in your image. And the fade suggested to me a less than perfect registration. So I must ask, how much confidence do you have that your line (1) actually exists, and (2) is correctly positioned? One problem to be aware of is that our eye/brain system is predisposed to see lines and patterns in complex textures - look at stucco, or even defocussed text on a page, and you will see lines. The more you look the more you see. I've been guilty of it myself.

Phil

[tfisher]

Grrr. Here's a riddle for you. I still think I see a line, but I don't think its really there.

I took volcanopele's advice from the calibration thread, and tried to build a residual flatfield image as an average of bland images, in order to correct for artifacts not removed by the current calibration routines. Here's what I get as an approximation of that residual flatfield (only 3 images averaged, with some obvious noise removed, contrast stretched so you can see):



And with more contrast stretching around the area in question:



Playing with raw Cassini Titan images is a bumpy road!