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numbers in polar grid back to rectangular with opposite of interpolation

Hello

 

I am having an image. I converted this image to 2D array. Now i do the polar conversion in this array.Suppose on a polar grid i need values along 6 angles(60,120,180,240,300,360 degrees). I am having a 2D array in Rectangular grid. So i nterpolate values in 2D array and found the required values in polar grid.  With these values i perfomed FFT and got a plot. Now i take the peak values from this FFT array and i need to go back in the reverse direction so that i may see as real picture what these peak values look like.

 

So as a first step i do the inverse FFT for these values. What would bethe next step.? How can i get those old points in 2D array from this interpolated values in polar grid?

 

Thanksss

See attachmenet to understand the rectangular polar grid system

Nghtcwrlr

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Message 1 of 4
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Hello Nghtcrwlr

 

can you explain you problem a little bit more precisely, or can you

put some code from your project as an attachment.

 

What an solution do you search for your points?

 

best regards Alex

best regards
Alexander
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Previous information can be found here, here, here, here, here, here, here, here, ...
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You can use the mathscript "griddata" function.
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