IFFT_CVIP

ifft_cvip() - perform inverse fast fourier transform.

SYNTAX
DESCRIPTION
REFERENCE
EXAMPLE
CREDITS

SYNTAX

img = ifft_cvip(spect,block_size)

Input parameters include:

block_size - Should be a power of 2 or [ ].if empty,then functions finds the nearest power of 2 and zero pad the image,to that block size.Any other value smaller than image size will partiotion the image to windows of that block size and FFT will be calculated separately in each window.

Spect - The fourier transform of the input image.

Output parameters include :

img - Output image after inverse fft.

DESCRIPTION

This function computes the inverse fast fourier transform of the input image. The argument block_size should match the same value given for the forward transform. For more details look at the reference below.

REFERENCE

1.Scott E Umbaugh. DIGITAL IMAGE PROCESSING AND ANALYSIS: Applications with MATLAB and CVIPtools, 3rd Edition.

EXAMPLE

% Read Image

 I = imread('butterfly.tif');

% Calling  fft function

 spect = fft_cvip( I,[] );

%Calling inverse  fft function

 I_hat = ifft_cvip( spect,[] );

% Display input image

 figure;imshow(I);title('Input Image');

% Display output images

 figure;imshow(remap_cvip(log(1+abs(spect))));title('ffT output Image');

 figure; imshow(hist_stretch_cvip(I_hat,0,1,0,0));title(' output image after Ifft transform');

IFFT_CVIP

Contents

SYNTAX

DESCRIPTION

REFERENCE

EXAMPLE

CREDITS