2.11.1.2 fft2(Pro)

Menu Information

Analysis: Signal Processing: FFT: 2D FFT

Brief Information

Compute 2D fourier transform of data in matrix

Additional Information

This feature is for OriginPro only.

Command Line Usage

1. fft2 im:=[Mbook]1!Mat(1);

2. fft2 norm:=1;

3. fft2 sc:=1;

4. fft2 norm:=1 sc:=1 ocm:=<none> opm:=<none>; // Do not calculate complex or phase output

Variables

Display
Name
Variable
Name
I/O
and
Type
Default
Value
Description
Input Matrix im

Input

MatrixObject

<active>

Specifies the input matrix.

Imaginary Matrix im2

Input

MatrixObject

<optional>

Specifies the imaginary matrix.

Normalize Amplitude Matrix norm

Input

int

0

Specifies whether or not to normalize the amplitudes to 1

DC Shift Center sc

Input

int

0

If this variable is 1, the DC component will be put in the center of the result matrix. Otherwise, the DC component will locate at four corners of the result matrix.

Complex Matrix ocm

Output

MatrixObject

[<new>]<new>!

Specifies the complex result matrix.

See the syntax here.

Amplitude Matrix oam

Output

MatrixObject

[<same>]<new>!

Specifies the amplitude matrix.

See the syntax here.

Phase Matrix opm

Output

MatrixObject

[<same>]<new>!

Specifies the phase matrix.

See the syntax here.

Power Matrix owm

Output

MatrixObject

[<same>]<new>!

Specifies the power matrix

See the syntax here.

Log Amplitude Matrix olam

Output

MatrixObject

[<same>]<new>!

Specifies the logarithm base 10 of amplitude matrix.

See the syntax here.

Log Power Matrix olwm

Output

MatrixObject

[<same>]<new>!

Specifies the logarithm base 10 of power matrix.

See the syntax here.

Examples

1. To compute the 2D FFT of active matrix, use the script command:

fft2

2. To open the fft2 dialog, use the script command:

fft2 -d

3. To perform 2D FFT to data using a pre-saved theme file, save your preferences in the fft2 dialog. Execute it by typing the following script command, using your own saved-theme title:

fft2 -t "my fft2 theme.oth"

More Information

For more information, please refer to our User Guide.


Related X-Functions

ifft2, fft1, ifft1


Keywords:amplitude, phase, power