Inverse FFT

This option evaluates the inverse fast Fourier transform of a buffer or data contained in the internal memory array. The calculation is performed on an image containing wave number domain data with 256 pixels in the horizontal direction and 128 in the vertical. When operating on a buffer, the resolution is first reduced to this and the image copied to the internal memory array.

Calculate inverse FFT on which buffer (-1 for memory) ?

If positive, this entry specifies the buffer containing the image to be inverse transformed. The selected buffer is made the current output buffer, the resolution reduced to 256x128 pixels, the contents transferred to the internal memory aray and the inverse transformation computed. If an entry of -1 is specified, then it is assumed the data to be inverse transformed is already contained in the internal memory array.

Transform in Horizontal, Vertical or Both ?

The answer to this question determines whether the image is to be inverse transformed in the horizontal direction only (<H>), the vertical direction only (<V>), or both the horizontal and vertical directions (<B>).

Calculating inverse FFT...

Parent menu

Main Menu

DigImage User Documentation

Stuart Dalziel, last page update: 19 February 1996