Frequency Domain
Owning Palette: Image ProcessingInstalled With: NI Vision Development ModuleUse the Frequency Domain VIs to perform frequency processing and other tasks on images. Use these VIs to convert an image from the spatial domain to the frequency domain using a two-dimensional Fast Fourier Transform (FFT) and convert an image from the frequency domain to the spatial domain using the inverse FFT. These VIs also extract the magnitude, phase, real, and imaginary planes of the complex image.
| Palette Object | Description |
|---|---|
| IMAQ FFT |
Computes the FFT of an image. The FFT creates a complex image in which high frequencies are grouped at the center, while low frequencies are located at the edges. |
| IMAQ InverseFFT |
Computes the inverse FFT of a complex image. |
| IMAQ ArrayToComplexImage |
Creates a complex image from a 2D array of complex numbers. |
| IMAQ ArrayToComplexPlane |
Replaces the real part or the imaginary part of a complex image, starting from a 2D array of floating-point values. |
| IMAQ ImageToComplexPlane |
Extracts the pixels from an 8-bit, 16-bit, 32-bit floating-point, or Complex image into the real part or imaginary part of a complex image. |
| IMAQ ComplexImageToArray |
Extracts the pixels from a complex image into a complex 2D array. |
| IMAQ ComplexPlaneToArray |
Extracts the pixels from the real part, imaginary part, magnitude, or phase of a complex image into a 2D array of floating-point numbers. |
| IMAQ ComplexPlaneToImage |
Extracts the pixels from the real part, imaginary part, magnitude, or phase of a complex image into an 8-bit, 16-bit, or 32-bit floating-point image. |
| IMAQ ComplexConjugate |
Computes the conjugate of a complex image. This VI converts the complex pixel data z = a + ib of a complex image into z = a – ib. |
| IMAQ ComplexAttenuate |
Attenuates the frequencies of a complex image. |
| IMAQ ComplexAdd |
Adds two images where the first is a complex image, or adds a complex image and a complex number. |
| IMAQ ComplexSubtract |
Subtracts two images where the first is a complex image, or subtracts a complex number from a complex image. |
| IMAQ ComplexFlipFrequency |
Transposes the frequency components of a complex image. The high and low frequency components of a complex image are inverted to produce a central symmetric representation of the spatial frequencies. |
| IMAQ ComplexTruncate |
Truncates the frequencies of a complex image. |
| IMAQ ComplexMultiply |
Multiplies two images where the first is a complex image, or multiples a complex image and a complex number. |
| IMAQ ComplexDivide |
Divides one image by another where the first is a complex image, or divides a complex image by a complex number. |