Vignetting, discussion about methods of resolution Options

[Tman]

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

[MichaelT]

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

[jaredGalen]

Hi, I haven't a much of a chance to do any coding yet.
I just want to clarify something.
MichaelT, the CONGRID command you use. I have to implement that myself but
I want to check that all I have to do is take a two-dimensional array and
subsample it down to the smaller size.

Hopefully over the weekend I'll get a chance to get something done. After the Ireland v Australia rugby match of course.

[MichaelT]

Hi, I haven't a much of a chance to do any coding yet.
I just want to clarify something.
MichaelT, the CONGRID command you use. I have to implement that myself but
I want to check that all I have to do is take a two-dimensional array and
subsample it down to the smaller size.

Yep, that's it

Hopefully over the weekend I'll get a chance to get something done. After the Ireland v Australia rugby match of course. 

Talking about Australia:
The Socceroos just made it to the World Cup in Germany next year by beating Uruguay 4-2 on penalty shoot-out.
And I used to watch rugby, too, when I lived in Hobart in 1999/2000. Unfortunately, its impossible to watch it here.

Michael