Forward and backward fourier transform image in java

Question

Can anyone suggest a java library to perform forward and backward Fourier transform on images? Either RGB or gray-scale or binary , that doesn't matter since I've converted the image to all these ;)

I do searched but most of the image processing libraries like marvin, JAI etc don't have Fourier transform. So I thought anyone who have done this earlier could suggest me one

Answer 1

JAI (Java Advanced Imaging API) has classes DFTDescriptor and IDFTDescriptor which seem to match.

• API docs for DFTDescriptor describe it as follows:

  ...The "DFT" operation computes the discrete Fourier transform of an image.

• for inverse transform, there is IDFTDescriptor:

  ...The "IDFT" operation computes the inverse discrete Fourier transform of an image.

Answer 2

JTransforms is probably the fastest Java FFT library around. It's a generic (not particularly "image") DFT (and DCT and DST and DHT) transformer and works on double[] arrays so you would need to implement the image -> double[] -> image transforms yourself though.