Vignetting, discussion about methods of resolution |
Vignetting, discussion about methods of resolution |
 Aug 24 2005, 07:37 AM
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#1
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Member  Group: Members Posts: 877 Joined: 7-March 05 From: Switzerland Member No.: 186  |
Hi Nirgal and all, I would like to discuss about vignetting and methods of resolution for it. I'm mainly interested in mathematical methods that could automatically calculate and adjust the right grey value for each pixel in a single picture.
My current method works with more or less transparent layers over the original picture that so roughly are able to balance the grey values. A perfect layer have to be the exact inverted brightness difference of each picture with this shadow effects. This method is very effective if you get the correct inverted values. These shots of the Mars sky come nearly at such a perfect mask, but not always. And of course the center of the pictures lose much of theirs original brightness/luminance sadly. I have in mind a mathematical method that can adjust each grey value in a pic in order to obtain a completely balanced brightness over the entire picture. But I'm not in the position to reach that. I only know one have to start with the calculation of the grey values in the center of the picture. In the center are quasi the reference values of the whole picture, if I'm correct. Is there a possibility (mathematical method) to get (roughly) the same brightness and luminance like in the center over the whole picture from the MERs? Greetings, Peter -------------------- |
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Nov 16 2005, 08:47 AM
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Member Group: Members Posts: 156 Joined: 18-March 05 From: Germany Member No.: 211 |
I made a minor modification to the program. I don't know whether that will make any difference to the problem that you encountered James. Just try it out and tell me what the result is. Version 2.0.1 can be found here: AntiVig
Michael |
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Nov 17 2005, 03:10 AM
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#3
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 Senior Member Group: Moderator Posts: 2262 Joined: 9-February 04 From: Melbourne - Oz Member No.: 16 |
QUOTE (MichaelT @ Nov 16 2005, 07:47 PM) I made a minor modification to the program. I don't know whether that will make any difference to the problem that you encountered James. Just try it out and tell me what the result is. Version 2.0.1 can be found here: AntiVig Michael  Will do, thanks Michael, will be over the weekend however, v-busy today/tomorrow. James -------------------- |
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Tman Vignetting Aug 24 2005, 07:37 AM
Nirgal Hi Tman,
mathematically, we can describe vignetti... Aug 24 2005, 11:29 PM Tman Hi Nirgal, probably you're right and it's ... Aug 25 2005, 11:26 AM
Nirgal Thanks Micheal,
hopefully I will find the time to... Aug 25 2005, 08:46 PM Tman QUOTE (Nirgal @ Aug 25 2005, 10:46 PM)...no n... Aug 25 2005, 09:29 PM Tesheiner QUOTE (Tman @ Aug 25 2005, 11:29 PM)Guess I... Aug 26 2005, 06:42 AM MichaelT Hi Tman,
I tried it using "Fast Fourier Tran... Aug 25 2005, 12:42 PM Tman Hi Michael, best we would talk about it in German,... Aug 25 2005, 02:17 PM MichaelT QUOTE (Tman @ Aug 25 2005, 02:17 PM)Hi Michae... Aug 25 2005, 04:39 PM Nirgal QUOTE (MichaelT @ Aug 25 2005, 06:39 PM)Proba... Aug 25 2005, 05:16 PM MichaelT QUOTE (Nirgal @ Aug 25 2005, 05:16 PM)Hi Mich... Aug 25 2005, 05:59 PM Tman Yeah sounds really good so far That would be fant... Aug 25 2005, 08:38 PM MichaelT Nirgal, I finished the commenting of my program to... Aug 26 2005, 05:57 PM MichaelT I have now modified the anti-vignetting-program (u... Sep 14 2005, 05:49 PM dilo WOW!
MichaelT, I think would be really GREAT t... Sep 14 2005, 06:38 PM mhoward QUOTE (dilo @ Sep 14 2005, 06:38 PM)WOW!
... Nov 11 2005, 04:09 PM dilo QUOTE (mhoward @ Nov 11 2005, 04:09 PM)If the... Nov 13 2005, 08:02 AM Bob Shaw MichaelT:
Do you think your anti-vignetting app c... Sep 14 2005, 06:53 PM MichaelT QUOTE (Bob Shaw @ Sep 14 2005, 06:53 PM)Micha... Sep 14 2005, 07:39 PM Bob Shaw QUOTE (MichaelT @ Sep 14 2005, 08:39 PM)Bob, ... Sep 14 2005, 08:43 PM djellison I'm guessing there's no flatfield or darkf... Sep 14 2005, 07:03 PM tedstryk I usually try to make a blank image with my digita... Sep 14 2005, 07:32 PM MichaelT Hi,
I put an updated version of the anti-vignetti... Oct 24 2005, 04:30 PM Tesheiner QUOTE (MichaelT @ Oct 24 2005, 06:30 PM)Anywa... Nov 1 2005, 02:25 PM jvandriel Tman,
what I mean to say with those lines is the ... Nov 1 2005, 10:31 AM Tman You're right Jvandriel, it's for both very... Nov 1 2005, 11:59 AM djellison I dont mind it running in IDL, but I would really ... Nov 1 2005, 04:00 PM MichaelT QUOTE (djellison @ Nov 1 2005, 04:00 PM)I don... Nov 1 2005, 04:22 PM MichaelT I just put online Version 2.0, now with batch proc... Nov 1 2005, 05:45 PM Tman Hi Michael,
Tried the batch processing just with ... Nov 1 2005, 06:58 PM jvandriel Michael T,
today I used for the first time your a... Nov 3 2005, 03:20 PM Nix I'm starting to use your tool too, looks prett... Nov 3 2005, 07:12 PM MichaelT Hi Michael,
it would indeed be very nice if someo... Nov 13 2005, 06:17 PM jaredGalen I would be interested in giving it a go. I made a ... Nov 13 2005, 06:49 PM MichaelT QUOTE (jaredGalen @ Nov 13 2005, 06:49 PM)I w... Nov 14 2005, 06:12 PM jaredGalen Wow, okay.
Looks like I have my work cut out for ... Nov 14 2005, 06:33 PM slinted Michael, thank you for sharing the code to this ap... Nov 14 2005, 11:15 PM jaredGalen QUOTE (slinted @ Nov 15 2005, 12:15 AM)Jared,... Nov 15 2005, 09:05 AM jamescanvin How long does this program take to run for you guy... Nov 15 2005, 02:50 AM MichaelT QUOTE (jamescanvin @ Nov 15 2005, 02:50 AM)Ho... Nov 15 2005, 10:04 AM Tman The same to me - 5 seconds.
My PC system runs 2,4... Nov 15 2005, 10:51 AM jamescanvin Hmm, 5 seconds eh, that's a bit quicker than 5... Nov 15 2005, 01:34 PM Nix no mac, but 3 seconds, although it might well be a... Nov 15 2005, 05:28 PM jamescanvin QUOTE (NIX @ Nov 16 2005, 04:28 AM)Hope you f... Nov 15 2005, 11:13 PM jaredGalen Hi, I haven't a much of a chance to do any cod... Nov 16 2005, 01:38 PM MichaelT QUOTE (jaredGalen @ Nov 16 2005, 01:38 PM)Hi,... Nov 16 2005, 03:12 PM Nirgal Micheal,
I just like to say thank you for sharing... Nov 16 2005, 08:36 PM MichaelT QUOTE (Nirgal @ Nov 16 2005, 08:36 PM)Micheal... Nov 17 2005, 08:45 PM jamescanvin QUOTE (MichaelT @ Nov 16 2005, 07:47 PM)I mad... Nov 19 2005, 02:43 AM MichaelT QUOTE (jamescanvin @ Nov 19 2005, 02:43 AM)It... Nov 19 2005, 08:05 AM jvandriel MichaelT,
I just downloaded Anti_Vig 2.0.1, but w... Nov 18 2005, 12:41 PM MichaelT QUOTE (jvandriel @ Nov 18 2005, 12:41 PM)Mich... Nov 18 2005, 01:49 PM Tman Hi Jvandriel,
I guess you renamed it as "Ant... Nov 18 2005, 01:44 PM MichaelT QUOTE (Tman @ Nov 18 2005, 01:44 PM)Hi Jvandr... Nov 18 2005, 01:54 PM MichaelT Would you like me to include the version number in... Nov 18 2005, 02:04 PM Tman Hi Michael, just reply overlap.
Regarding version... Nov 18 2005, 02:09 PM jvandriel MichaelT and Tman,
thanks for the advice. I did i... Nov 19 2005, 02:04 PM MichaelT QUOTE (jvandriel @ Nov 19 2005, 02:04 PM)is i... Nov 24 2005, 05:40 PM MichaelT After a long, long time I am currently developing ... May 5 2006, 11:46 AM hortonheardawho Hi Michael,
I have been interested in your anti-v... Jun 9 2006, 10:16 PM hortonheardawho Doesn't look like Michael is monitoring this t... Jun 11 2006, 07:58 PM MichaelT QUOTE (hortonheardawho @ Jun 11 2006, 07... Jun 12 2006, 05:12 PM DonPMitchell Very cool work, Michael.
I know in a mathematical... Jun 12 2006, 06:07 PM Airbag QUOTE (DonPMitchell @ Jun 12 2006, 02:07 ... Jun 13 2006, 02:47 AM helvick QUOTE (Airbag @ Jun 13 2006, 03:47 AM) Th... Jun 13 2006, 12:53 PM MichaelT QUOTE (DonPMitchell @ Jun 12 2006, 06:07 ... Jun 14 2006, 05:06 PM DonPMitchell If they measured the camera response, then that is... Jun 14 2006, 05:42 PM jrdahlman Is this anti-vignetting program specifically for M... Jun 29 2006, 07:43 PM MichaelT QUOTE (jrdahlman @ Jun 29 2006, 07:43 PM)... Jul 3 2006, 06:03 PM edstrick The Voyager (mariners, viking) cameras have other ... Jul 4 2006, 09:51 AM jrdahlman Sorry for the delay. My website requires me to upl... Jul 5 2006, 04:47 PM MichaelT QUOTE (jrdahlman @ Jul 5 2006, 04:47 PM) ... Jul 6 2006, 12:37 PM ugordan QUOTE (jrdahlman @ Jul 5 2006, 05:47 PM) ... Jul 6 2006, 01:01 PM MichaelT QUOTE (jrdahlman @ Jul 5 2006, 04:47 PM) ... Jul 6 2006, 05:59 PM um3k Another problem is that Voyager images exhibit a l... Jul 6 2006, 01:49 PM um3k jrdahlman, these websites may come in handy for yo... Jul 6 2006, 08:06 PM jrdahlman Oh, I know that you can download all the images. I... Jul 6 2006, 08:59 PM um3k QUOTE (jrdahlman @ Jul 6 2006, 04:59 PM) ... Jul 7 2006, 12:57 AM edstrick Playing with Voyager 1 wide angle images, I found ... Jul 7 2006, 11:37 AM jrdahlman I would like to point out that the program um3k... Jul 10 2006, 06:19 AM edstrick Dark current images are those taken with zero expo... Jul 10 2006, 09:42 AM |
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