How the Error Map works?

[Zealous]

Hi!

So problem is that I'm using objective which gives highly distorted image but i'm still having values -1 in Error Map. Why it does not give higher values than that? Or is that function working anyways...

[BruceAmmons]

My best guess on the error map is that it simply indicates the areas of the image that are calibrated.  If it is an uncalibrated area, the error is -1 which probably means undefined.  I'm not sure what the error map values are in the calibrated regions.

The NI routines only calibrate inside the grid that you define using points.  Outside the grid, the image is uncalibrated.

Bruce

[Zealous]

Oh, I see now.. I was wondering that what was purpose of "-1" but when its not calibrated it seems understable... and now when I changed error map to show decimals it seems that zeros turns to very very small numbers... now I have to find out what to do with them... maybe multibly each number with constant and represent error map as picture... or does that make any sense anyways.. :S

[BruceAmmons]

It would be interesting to know what the rest of the error map values mean.  I suspect displaying them using an intensity graph would create an interesting image.  I would suspect each value indicates the relative accuracy of the mapping of that pixel.  Pixels near edges and corners would probably rank a little lower in accuracy, depending on the amount of non-linear distortion.

Bruce

[Zealous]

I got most interesting picture when I changed my Error Map as follows: I ignored "-1" (or lets say turned those as 0 ->Black) and other numbers which were so small (like 0,00028)  I multiplied them with constant, so I was able to show them as picture. That picture what I got was amazing, when I changed my picture format as binary (where every value has unique color)  I was able to recognize my calibration target (dots) and there was also some odd area around each dot. Also every dot&area was different size...

So question is that what I see in that picture? Is it usable to represent quality of camera system?

oh, and yes, I shall add attachment of my mystery picture when I'm back to office by end of this week and try also show error map in intensity graph, thanks for the advices! 

Like to hear your thoughts 🙂

Message Edited by Zealous on 10-01-2007 11:07 PM

Message Edited by Zealous on 10-01-2007 11:23 PM

[Zealous]

Hi!

Just adding the attachment where you can see Error Map as a picture and same array in intensity craph. Now I have to find out is that usable to represent systems distortion..

Like to hear your thoughts 🙂