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Extract Wavelet Bands (G Dataflow)

Last Modified: June 25, 2019

Extracts wavelet bands from the image.

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image in

Reference to the source image.

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wavelet options

Input that specifies how the node extracts the wavelet bands used to compute texture features.

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type

Wavelet type to use for the discrete wavelet analysis.

The options include two types of wavelets, orthogonal and biorthogonal. The following table describes the wavelet types and provides information for selecting a wavelet type.

Type Name Abbreviation Notes
Orthogonal Wavelets Haar - Orthogonal wavelets are not redundant and are suitable for image denoising and compression.
Daubechies dbxx
Coiflets coifx
Symmlets symx
Biorthogonal Wavelets -
x indicates the order of the wavelet. A higher order indicates a smoother, more regular, wavelet.

Default: db02

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wavelet bands to use

Wavelet bands to use for feature extraction.

If no band is selected, all bands are used. The following wavelet bands are available:

  • Low Low
  • Low High
  • High Low
  • High High
  • Low Low Low
  • Low Low High
  • Low High Low
  • Low High High
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min energy level

Minimum amount of energy that should be present in the wavelet bands that are used.

If this control is set to 100, all bands are used. This control is ignored if a wavelet band is selected using wavelet bands to use.

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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lll

2D array that contains data from the Low-Low-Low wavelet band.

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llh

2D array that contains data from the Low-Low-High wavelet band.

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image out

Reference to the source image.

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ll

2D array that contains data from the Low-Low wavelet band.

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lh

2D array that contains data from the Low-High wavelet band.

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hl

2D array that contains data from the High-Low wavelet band.

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hh

2D array that contains data from the High-High wavelet band.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.
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lhl

2D array that contains data from the Low-High-Low wavelet band.

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lhh

2D array that contains data from the Low-High-High wavelet band.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application


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