numbers in polar grid back to rectangular with opposite of interpolation

[Nghtcrwlr]

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

[Duffy2007]

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

[smercurio_fc]

Previous information can be found here, here, here, here, here, here, here, here, ...

[altenbach]

You can use the mathscript "griddata" function.