MSL Images & Cameras, technical discussions of images, image processing and cameras |
MSL Images & Cameras, technical discussions of images, image processing and cameras |
Aug 16 2012, 11:05 PM
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Senior Member Group: Members Posts: 2228 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116 |
I'm still trying to figure out a number of things about the new images we are trying to work with. Assuming others are likewise trying to learn, I thought I would open this thread to create a place for such discussions.
I'd like to start out with a comment about raw image contrast. There have been several postings in the main threads about whether or not the MSL raw images have been stretched like those from the MER missions. I am certainly no expert on this, but it looks to me as if the MSL images have not been stretched at all. I haven't tried to analyze all of the image types, but the hazcams and navcams have pixel brightness histograms that are very different from their MER counterparts. This attached image compares MER and MSL navcams along with their luminosity histograms. The MSL images clearly are not using the entire, available range of brightness values, whereas the MER raws do. For this reason, the MSL raw images can usually be nicely enhanced by simply stretching the distribution of brightness across the full 256 value range. -------------------- ...Tom
I'm not a Space Fan, I'm a Space Exploration Enthusiast. |
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Aug 27 2012, 08:22 PM
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Member Group: Members Posts: 122 Joined: 26-June 04 From: Austria Member No.: 89 |
A few remarks about the near focus of the mastcams:
The pictures of the sundial taken by the mastcam-100 are not in focus up to now. I suspect that the near focus of this camera is a little bit beyond - for example the cable that running left of the dial is sharp: http://mars.jpl.nasa.gov/msl-raw-images/ms...1000E1_DXXX.jpg In contrast the m34 has taken sundial pictures that are in best focus: http://mars.jpl.nasa.gov/msl-raw-images/ms...0000E1_DXXX.jpg Did anyone know the distance from the mastcams to the dial ? Robert |
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Aug 27 2012, 08:55 PM
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#3
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
Did anyone know the distance from the mastcams to the dial ? The Marsdial is roughly 7.6 cm square and one side is 296 pixels long in the 34mm image. The IFOV of the 34mm is about 218 microrads, so the distance is roughly 1.2 meters. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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