FFT on Image

[Haitham_khairy]

I have an application that uses FFT to  analyze thermal image 
How can I represnt the output of FFT Function Mathematically

Attached Screenshot ,vision assistant file and image file for demonstration 

[tolltroll]

Hi Haitham_khairy,

The mathematical breakdown of FFT operations in NI Vision software can be found in the Vision Concepts manual, in pages 7-3 to 7-12.

Nick

Applications Engineer

National Instruments

[Haitham_khairy]

Thanks Nick for your reply ,

I use IMAQ FFT VI to computes the FFT of an image which creates a complex image .

what i need is how to extract FFT data ( Frequency vs amplitude )

Can you suggest me how to get get the amplitude and frequency data from real and imaginary array Or Convert the image to a usable form in imaq So that we can use normal image processing.

[tolltroll]

Hi Haitham_khairy,

I was able to find the following documentation on the available frequency-domain functions in IMAQ:

Frequency Domain

From here, I thought the ComplexImageToArray or ComplexPlaneToArray functions might be appropriate.

If you need more information, I'll have to do some research on my end. Any more information you could provide would be helpful!

Nick

Applications Engineer

National Instruments