Deep Impact camera data, Messing about with images from the PDS |
Deep Impact camera data, Messing about with images from the PDS |
Dec 28 2009, 07:06 PM
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#1
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
I'm wondering if anybody here has spent any time working on the Tempel 1 images from Deep Impact. The data are available at the Small Bodies Node (see e.g. http://pdssbn.astro.umd.edu/holdings/dif-c...0/dataset.html), and Version 2 of the PDS archive (which appears to have been published 3 years ago) includes versions of the data that have been calibrated, cleaned of instrument artifacts, and converted to units of radiance and also I/F. The HRI data have not been deconvolved to remove the blur: a bit of playing shows that without deconvolution, HRI images look pretty similar to MRI images. Attached is a color composite I made of the highest-resolution full-globe shots of Tempel 1 captured by the MRI before the impact. The image isn't big but there's more variety in color than I expected. This is made from the I/F images and is an RGB composite of red, green, and violet continuum filter images, overlaid over a clear image that I sharpened slightly. It's very red, but I think that's real.
Has anybody else worked with these? -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Dec 29 2009, 12:04 AM
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#2
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
"per partes". First rough match of the color and BW image is done (color image is resampled and rotated), than misfitting parts are removed and replaced by more suitable resampled version of the color image (mostly same image).
This is simplest and quickest way, when images are similar. More sophisticated is warping, but I don't know, if this feature is in the Photoshop. But It is in ImageJ. -------------------- |
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Dec 29 2009, 04:11 PM
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#3
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
This is simplest and quickest way, when images are similar. I do that sometimes as well. Warping the images in Photoshop (or any geometric operation for that matter) lowers image sharpness so I tend to avoid it where I can. More sophisticated is warping, but I don't know, if this feature is in the Photoshop. It's available in Photoshop, but (at least in CS2) you don't get many control points so the feature is of limited use when you want tight control like in the example above. -------------------- |
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Dec 29 2009, 05:19 PM
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#4
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
I will often work with images at 5x...that significantly reduces the impact of warping.
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