Instrument commissioning phase, Beginning final approach to the comet |
Instrument commissioning phase, Beginning final approach to the comet |
Mar 26 2014, 06:23 PM
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#1
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Junior Member Group: Members Posts: 93 Joined: 21-January 13 Member No.: 6845 |
Today a member of the camera science team put up the first images of the comet on his office door. So the camera works. He said on the image is M107 and the comet could this be?
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Jul 17 2014, 05:24 PM
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#2
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Be careful. ESA posted an image that shows you the original resolution of the data. Most of the features that you've identified are barely more than one pixel across.
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Jul 17 2014, 09:16 PM
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#3
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Be careful. ESA posted an image that shows you the original resolution of the data. Most of the features that you've identified are barely more than one pixel across. I've been aware, that it's close the limit of the resolution, and first have been skeptical, too. For this I've first smoothed the image by a 1.5 pixel Gauss blur, before applying a 5 pixel hipass filter, to later enhance the image. Before identifying feature candidates I've checked, whether they occur in at least two images. The usual averaging technique to beat down noise doesn't work easy here, because the perspective changes with each image. Here the valley candidate as an example (crop of the DLR image) : (could also be an elliptical crater or two overlapping craters) Of course, there is still a risk, that some is an artifact, but it should reduce exponentially with the number of images a feature occurs. |
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