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 15 2005, 02:50 AM
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#2
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Senior Member Group: Moderator Posts: 2262 Joined: 9-February 04 From: Melbourne - Oz Member No.: 16 |
How long does this program take to run for you guys?
I got it running on my Mac yesterday but it takes 4 - 5 mins on each raw pancam frame! I know it is a complicated procedure and it's running through a virtual machine so it's not going to be instantaneous but my activity monitor says it's only using about 10% of my CPU. Just wondering... James -------------------- |
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Nov 15 2005, 10:04 AM
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#3
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Member Group: Members Posts: 156 Joined: 18-March 05 From: Germany Member No.: 211 |
QUOTE (jamescanvin @ Nov 15 2005, 02:50 AM) How long does this program take to run for you guys? I got it running on my Mac yesterday but it takes 4 - 5 mins on each raw pancam frame! I know it is a complicated procedure and it's running through a virtual machine so it's not going to be instantaneous but my activity monitor says it's only using about 10% of my CPU. Just wondering... James Thats really a long time I have a 2.8 GHz Windows PC (512 MB ram) and it usually takes about 5 seconds to process one image, using the virtual machine... What about the other users? How long does it take you to get one image done? Michael |
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