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
Post
#1
|
||
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. |
|
|
||
Sep 16 2012, 06:54 AM
Post
#2
|
|
Junior Member Group: Members Posts: 36 Joined: 14-July 06 Member No.: 972 |
When comparing the left and right Mastcams of the sun I see a couple of things that I don't understand. The first is the large artifact at the bottom of the Mastcam 100 images. Is it a lens flare? The second is the color. The Mastcam34 thumbs are grey but the Mastcam100 thumbnails show as blue. I figured that this might have to do with the neutral density (sun) filters being different wavelengths, but looking at http://www.msss.com/msl/mastcam/MastCam_description.html the Mastcam34 sun filter is 440 nm which should be blue/violet and the Mastcam100 is 880 nm which should be near infrared. Sorry if this is obvious to others, but it seemed strange to me.
|
|
|
Lo-Fi Version | Time is now: 16th May 2024 - 04:40 AM |
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |