30th Anniversary of the Voyager 1 Flyby of Jupiter |
30th Anniversary of the Voyager 1 Flyby of Jupiter |
Mar 5 2009, 08:20 PM
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Senior Member Group: Moderator Posts: 3242 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Today marks the 30th anniversary of Voyager 1's flyby of Jupiter. On March 5, 1979, Voyager 1 flew through the Jupiter system providing a wealth of information of Jupiter, its magnetic field, and moons. Thanks to Voyager 1, the Galilean satellites became worlds with real geology and amazing vistas. Voyager 1 also revealed Jupiter's ring system and Io's volcanism for the first time.
I've written up a longer post about the encounter with Io on my blog, which also has an animation of the flyby: http://gishbar.blogspot.com/2009/03/30th-a...1-flyby-of.html -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Mar 22 2010, 10:13 AM
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Thanks!
Tasp: If my memory is right, so different pixels size because of brightness isn't such problem. But vidicon cameras have always bigger geometrical distorsion than CCD cameras. Especially in corners. But CCD cameras also have faults, for example bleeding. And yes, what you said about difficulties with color processing, all is true. Same problem is with Cassini or Galileo images, but in this case, images are taken more quickly and in lower flyby velocities, so changes aren't so prominent. I overcome these problems in different ways. Actually most easy way (and case of this Callisto image) is using wide angle images. Then color information has much lower resolution (in this case 8×). It's no problem with detail preservation. In some graphics programs you can combine two images in such way, that you have full details from BW image and color information from color image (ImageJ, PaintShop Pro). Or you can use narrow angle images taken with different filters, but these were taken only at beginning of flybys. Color information in these images has higher resolution, but it's difficult to remove differences between them. Then you can remapping all images on sphere or apply warping techniques. Another way is using color maps from another missions or different part of the same mission (for example Jupiter's combined LORRI + HST images). Last resort is color from photometry. This is badly usefull in some cases (Io, Jupiter, Earth), but usable in others (Uranus moons, asteroids etc.). Last question: Actually I don't know about scientific framing cameras with this processing. But monitoring camera on Mars Express is actually color camera with multicolor CCD (with Bayer pattern). And we have multicolor push-broom imagers with linear CCD's like HRSC, HiRISE or MVIC (functioning in same way as PC scanner). -------------------- |
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