IPB
X   Site Message
(Message will auto close in 2 seconds)

Welcome Guest ( Log In | Register )

MSL Images & Cameras, technical discussions of images, image processing and cameras
CosmicRocker
post Aug 16 2012, 11:05 PM
Post #231


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.
Attached Image


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.
Go to the top of the page
 
+Quote Post

Posts in this topic
- CosmicRocker   MSL Images & Cameras   Aug 16 2012, 11:05 PM
- - jmknapp   This is what David Vaniman said at the telecon: ...   Nov 1 2012, 02:10 AM
|- - mcaplinger   QUOTE (jmknapp @ Oct 31 2012, 07:10 PM) T...   Nov 1 2012, 02:49 AM
- - jmknapp   OK, put it this way--do you think there could in p...   Nov 1 2012, 03:13 AM
|- - mcaplinger   QUOTE (jmknapp @ Oct 31 2012, 08:13 PM) d...   Nov 1 2012, 03:55 AM
- - ronald   My first though when I heard that "like in yo...   Nov 1 2012, 10:27 AM
- - jmknapp   Auto-color is not really that similar to what was ...   Nov 1 2012, 10:39 AM
- - ronald   Reminds me of a job where we should color the back...   Nov 1 2012, 11:11 AM
- - fredk   There's a series of daytime sky images from ma...   Nov 3 2012, 03:25 PM
- - Astro0   Ed, that's great. Took about 3-4 seconds on my...   Nov 4 2012, 06:34 AM
- - Zelenyikot   I noticed that the "schmutz" on the Mast...   Nov 6 2012, 10:48 PM
|- - mcaplinger   QUOTE (Zelenyikot @ Nov 6 2012, 03:48 PM)...   Nov 6 2012, 11:23 PM
- - ronald   Puzzled by Greenishs post I did compare MSL with M...   Nov 9 2012, 09:04 PM
|- - Greenish   ronald, I did initially make them as straight comp...   Nov 9 2012, 09:38 PM
- - Zelenyikot   Somebody can explain to me for what purpose photog...   Nov 17 2012, 03:05 AM
|- - mcaplinger   QUOTE (Zelenyikot @ Nov 16 2012, 08:05 PM...   Nov 17 2012, 06:24 AM
- - Zelenyikot   It seems to me this orange it is L3 L4 is red U...   Nov 18 2012, 12:32 AM
|- - mcaplinger   QUOTE (Zelenyikot @ Nov 17 2012, 05:32 PM...   Nov 18 2012, 01:14 AM
|- - Zelenyikot   Thanks for an explanation.   Nov 18 2012, 01:43 AM
|- - Airbag   Argh, so many beautiful panoramas yet still I see ...   Nov 26 2012, 08:02 PM
|- - RoverDriver   QUOTE (Airbag @ Nov 26 2012, 12:02 PM) Ar...   Nov 26 2012, 10:20 PM
- - ronald   Great Airbag - Thankyou! Its allways nice if y...   Nov 26 2012, 09:20 PM
- - ronald   How goes this and this (or this) together? This s...   Nov 29 2012, 11:56 AM
|- - mcaplinger   QUOTE (ronald @ Nov 29 2012, 04:56 AM) Th...   Nov 29 2012, 03:33 PM
- - Ant103   Come on ! This is just nothing than a differen...   Nov 29 2012, 12:46 PM
- - ronald   - I'm simply still not sure how bright the sur...   Nov 29 2012, 01:56 PM
- - ronald   Doing it the scientific way is far beyond my techn...   Nov 29 2012, 10:01 PM
|- - djellison   QUOTE (ronald @ Nov 29 2012, 02:01 PM) Th...   Nov 29 2012, 10:10 PM
|- - mcaplinger   QUOTE (ronald @ Nov 29 2012, 03:01 PM) I ...   Nov 29 2012, 10:19 PM
|- - djellison   QUOTE (mcaplinger @ Nov 29 2012, 02:19 PM...   Nov 29 2012, 10:25 PM
||- - vikingmars   QUOTE (djellison @ Nov 29 2012, 11:25 PM)...   Nov 29 2012, 10:58 PM
|- - ronald   QUOTE (mcaplinger @ Nov 29 2012, 11:19 PM...   Nov 30 2012, 10:53 AM
- - djellison   Yeah - the same words were used by Maki et.al. in ...   Nov 29 2012, 11:40 PM
- - iMPREPREX   Can someone please explain to me how to decipher t...   Jan 5 2013, 11:30 PM
|- - jamescanvin   QUOTE (iMPREPREX @ Jan 5 2013, 11:30 PM) ...   Jan 7 2013, 08:44 AM
- - Astro0   ADMIN NOTE: Apologies. I was moving two members pa...   Jan 7 2013, 11:39 AM
- - wildespace   Why aren't Mastcam images white-balanced like ...   Jan 15 2013, 05:29 PM
|- - mcaplinger   QUOTE (wildespace @ Jan 15 2013, 10:29 AM...   Jan 15 2013, 06:46 PM
||- - wildespace   QUOTE (mcaplinger @ Jan 15 2013, 06:46 PM...   Jan 15 2013, 07:37 PM
||- - mcaplinger   QUOTE (wildespace @ Jan 15 2013, 12:37 PM...   Jan 15 2013, 07:46 PM
|- - iMPREPREX   QUOTE (wildespace @ Jan 15 2013, 12:29 PM...   Jan 15 2013, 07:34 PM
- - jmknapp   For the multi-spectral sequences, does anyone know...   Feb 6 2013, 12:42 PM
|- - mcaplinger   QUOTE (jmknapp @ Feb 6 2013, 05:42 AM) Fo...   Feb 6 2013, 02:15 PM
- - elakdawalla   We're very close to the date of the first expe...   Feb 6 2013, 05:00 PM
- - CosmicRocker   That's good to hear. Can we expect to find t...   Feb 7 2013, 03:07 AM
- - Greenish   Per http://pds-geosciences.wustl.edu/missions/msl/...   Feb 7 2013, 02:43 PM
- - EdTruthan   Answered from a question in this thread... QUOTE ...   Mar 3 2013, 10:29 PM
|- - mcaplinger   QUOTE (EdTruthan @ Mar 3 2013, 03:29 PM) ...   Mar 4 2013, 01:08 AM
|- - fredk   QUOTE (EdTruthan @ Mar 3 2013, 11:29 PM) ...   Mar 4 2013, 03:55 PM
- - EdTruthan   Mike, I first noticed the three 34mm spots a few w...   Mar 4 2013, 05:22 AM
|- - mcaplinger   QUOTE (EdTruthan @ Mar 3 2013, 10:22 PM) ...   Mar 4 2013, 06:39 AM
- - Lightning   Do you about the schedule for MARDI images release...   May 10 2013, 09:50 PM
- - arko   Just a thought.. Saw this picture today http://mar...   Jun 3 2013, 06:24 PM
|- - mcaplinger   QUOTE (arko @ Jun 3 2013, 11:24 AM) JHow ...   Jun 3 2013, 06:37 PM
- - djellison   Yeah - it would take some very long exposures ( an...   Jun 3 2013, 08:17 PM
- - Astro0   It also might get a little creepy   Jun 3 2013, 11:00 PM
- - wildespace   A comparison of the Mastcam 100 and MAHLI images o...   Jun 4 2013, 09:58 AM
|- - mcaplinger   QUOTE (wildespace @ Jun 4 2013, 02:58 AM)...   Jun 4 2013, 11:47 AM
- - fredk   Those images are probably not the best comparison,...   Jun 4 2013, 05:40 PM
|- - wildespace   QUOTE (fredk @ Jun 4 2013, 06:40 PM) Thos...   Jun 4 2013, 09:11 PM
- - djellison   Almost 200 sols apart - 1/3rd of a martian year - ...   Jun 4 2013, 09:41 PM
|- - mcaplinger   QUOTE (djellison @ Jun 4 2013, 02:41 PM) ...   Jun 4 2013, 09:45 PM
- - Ant103   But at the end, of what are we arguing about ? Som...   Jun 4 2013, 10:19 PM
- - Gerald   According to this LPSC 2012 paper Mastcam is more ...   Jun 5 2013, 11:49 AM
|- - fredk   QUOTE (Gerald @ Jun 5 2013, 11:49 AM) The...   Jun 5 2013, 02:32 PM
|- - mcaplinger   QUOTE (Gerald @ Jun 5 2013, 04:49 AM) Acc...   Jun 5 2013, 02:49 PM
- - Phil Stooke   This is why I never do anything with color! P...   Jun 5 2013, 12:43 PM
- - wildespace   Sorry if I upset or aggravated anyone here. My mai...   Jun 5 2013, 05:07 PM
|- - mcaplinger   QUOTE (wildespace @ Jun 5 2013, 10:07 AM)...   Jun 5 2013, 05:30 PM
|- - fredk   QUOTE (mcaplinger @ Jun 5 2013, 05:30 PM)...   Jun 5 2013, 06:16 PM
|- - mcaplinger   QUOTE (fredk @ Jun 5 2013, 11:16 AM) Once...   Jun 5 2013, 06:29 PM
- - fredk   One way to account for our eyes adjusting for the ...   Jun 5 2013, 05:24 PM
- - arko   Night time shot!!! http://mars.jpl.na...   Jun 10 2013, 02:56 AM
- - nprev   Oh, man...that night-time shot is SO cool!...   Jun 10 2013, 11:06 AM
- - EdTruthan   JPL/NASA releases an 850 frame 1 Billion Pixel, 36...   Jun 19 2013, 06:00 PM
- - stevesliva   Kudos for the two versions of color... but did the...   Jun 19 2013, 06:56 PM
- - djellison   I think they stitched them outside, then uploaded ...   Jun 19 2013, 08:34 PM
|- - wildespace   QUOTE (djellison @ Jun 19 2013, 09:34 PM)...   Jul 6 2013, 07:12 AM
- - iMPREPREX   Hey all. I thought I would share these with the co...   Aug 2 2013, 09:52 AM
- - iMPREPREX   I thought I would share a quick video of how I mad...   Aug 6 2013, 05:41 AM
- - Gerald   I've been asked for an explanation of how I do...   Sep 3 2013, 01:06 PM
|- - dilo   Thanks Gerald for this intriguing explaination, no...   Sep 3 2013, 02:10 PM
|- - fredk   QUOTE (Gerald @ Sep 3 2013, 01:06 PM) pix...   Sep 3 2013, 06:09 PM
- - Gerald   You are correct with each item.   Sep 3 2013, 02:16 PM
- - Gerald   Point noise or blur filters are of the first ideas...   Sep 3 2013, 11:38 PM
- - Gerald   Trap pixel in Sol 395 Mastcam Right image? Edit: ...   Sep 18 2013, 08:23 PM
- - Greenish   I was wondering - for the folks that use Hugin or ...   Nov 1 2013, 04:25 PM
- - vikingmars   Self-explanatory... Color charts of MSl Sol 475...   Dec 10 2013, 10:26 AM
|- - ugordan   Automatic white balance via raw contrast stretch w...   Dec 10 2013, 02:18 PM
||- - vikingmars   QUOTE (ugordan @ Dec 10 2013, 03:18 PM) A...   Dec 10 2013, 08:18 PM
|- - djellison   QUOTE (vikingmars @ Dec 10 2013, 02:26 AM...   Dec 10 2013, 02:45 PM
|- - mcaplinger   QUOTE (djellison @ Dec 10 2013, 07:45 AM)...   Dec 10 2013, 03:17 PM
|- - vikingmars   QUOTE (djellison @ Dec 10 2013, 03:45 PM)...   Dec 10 2013, 03:40 PM
|- - mcaplinger   QUOTE (vikingmars @ Dec 10 2013, 08:40 AM...   Dec 10 2013, 04:44 PM
||- - Gerald   QUOTE (mcaplinger @ Dec 10 2013, 05:44 PM...   Dec 10 2013, 10:17 PM
|- - djellison   QUOTE (vikingmars @ Dec 10 2013, 07:40 AM...   Dec 10 2013, 05:01 PM
- - centsworth_II   Thank you for the belated explanation.   Dec 10 2013, 04:15 PM
- - serpens   Yes, not really what I would call self explanatory...   Dec 10 2013, 10:01 PM
6 Pages V  « < 2 3 4 5 6 >

« Next Oldest · MSL · Next Newest »
 

Reply to this topicStart new topic

 

Display Mode: Switch to: Standard · Switch to: Linear+ · Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

RSS Lo-Fi Version Time is now: 14th December 2024 - 12:37 AM
Powered By IP.Board © 2024  IPS, Inc.
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and 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.