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numbers in polar grid back to rectangular with opposite of interpolation



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?



See attachmenet to understand the rectangular polar grid system


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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
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Previous information can be found here, here, here, here, here, here, here, here, ...
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Message 3 of 4
You can use the mathscript "griddata" function.
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