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IMAQ Extract Wavelet Bands VI

NI Vision 2019 for LabVIEW Help

Edition Date: March 2019

Part Number: 370281AG-01

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Vision Developoment Module 2019 Help
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Owning Palette: Texture
Requires: NI Vision Development Module

Extracts wavelet bands from the image.

IMAQ Extract Wavelet Bands

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Image is a reference to the source image.

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Wavelet Options specifies how the VI extracts the wavelet bands that are used to compute texture features.

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Type specifies the wavelet type to use for the discrete wavelet analysis. The default is db02.

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 biorx_x Biorthogonal wavelets usually have a linear phase property and are suitable for image feature extraction.
x indicates the order of the wavelet. A higher order indicates a smoother, more regular, wavelet.
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Wavelet Bands To Use specifies the 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 specifies the 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 (no error) describes the error status before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.

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status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.

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code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.

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source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

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

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

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

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

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

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

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error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.

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status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.

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code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.

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source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

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

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

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