2d Gaussian Fit Problem.

[altenbach]

Sorry, I don't have IMAQ. Could you replace your image with a diagram constant of a 2D array?

Also, since your data is arranged in a grid, all you need is reshape to a 1D array (the picture array and the function output inside the model), you don't need this advanced coding that also works for scattered xyz data.

[altenbach]

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@altenbach wrote:

Also, since your data is arranged in a grid, all you need is reshape to a 1D array (the picture array and the function output inside the model), you don't need this advanced coding that also works for scattered xyz data.

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Here is an old example for this. (read the entire thread to fit for an elliptic peak of arbitrary rotation, see image below)

[xgatc]

Dear altenbach

I replaced the same image with static 2d array. thanks for your time

cheers

 xg

[altenbach]

As I said, you should use code that is optmized for gridded data. There is no reason to do the xyz dance.

Here's a quick rewrite of my older code.

(simply read your PNG file, wat a few seconds, and it will fit it just fine. For faster fitting, you should take a reasonably sized subset around the peak)

[altenbach]

And here's how it would look taking a reasonable subset. Much faster! (same model VI as above)

[xgatc]

Dear  altenbach

Many thanks for your quick reply and help. I thought of using the subset too.

I will need a newer version to read your code. ( my one is 2012 ).

very appreciated your time.

xg

[altenbach]

Here's the LabVIEW 2012 version.

(EDIT: rezipped and uploaded new version)

[xgatc]

Many thanks altenbach.   I tested it. it is great.  

the resaon I  wanted to try this is that some of our spot (which is the light reflect from a ball) are disrupted by  dust on the surface of the ball ( the  part of edge of the spot be eaten away ) which affacts the centroiding  calculation.

again, thanks for your help.

xg  

[Kirk]

I am having trouble extracting your zip file.  It seems corrupt.  Could you please re-upload a new version?

[altenbach]

This thread contains 6 zip files. can you tell which one is giving you problems?