Computes the multi-level inverse integer wavelet transform (IWT) and returns the reconstructed signal from the approximation coefficients and the detail coefficients. Wire data to the IWT coef input to determine the polymorphic instance to use or manually select the instance.


icon

Inputs/Outputs

  • cu16.png extension —

    extension specifies the method to use to pad data at the borders of the approximation coefficients and the detail coefficients before each iteration of the lifting scheme. The coefficient extension is essential for reconstructing the entire signal. When you select the extension method, make the transition between the input signal and the padded data as smooth as possible because a smooth transition generates fewer large detail coefficients and enhances the efficiency of the signal representation.

  • c1dcclst.png IWT coef —

    IWT coef specifies the approximation coefficients and the detail coefficients for the multi-level inverse integer wavelet transform (IWT). Each element of the array contains the 2D IWT results of one level. The ith element stores the approximation coefficients and the detail coefficients at level i+1.

  • c2di32.png low_low —

    low_low specifies the coefficients that are a low-resolution approximation of the original 2D signal.

  • c2di32.png low_high —

    low_high specifies the low_high coefficients. The high-frequency signal along the column direction influences the low_high coefficients.

  • c2di32.png high_low —

    high_low specifies the high_low coefficients. The high-frequency signal along the row direction influences the high_low coefficients.

  • c2di32.png high_high —

    high_high specifies the high_high coefficients. The high-frequency signal along the diagonal direction influences the high_high coefficients.

  • cu16.png wavelet —

    wavelet specifies the wavelet type of the integer wavelet analysis. The default is Haar. wavelet must be the same type as the wavelet type you selected in the WA Integer Wavelet Transform VI to compute IWT coef.

  • cerrcodeclst.png error in (no error) —

    error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

  • i2di32.png signal —

    signal returns the reconstructed integer signal.

  • ierrcodeclst.png error out —

    error out contains error information. This output provides standard error out functionality.

    • Examples

    Refer to the following VIs for examples of using the WA Inverse Integer Wavelet Transform VI:

    • Lossless Medical Image Compression VI: labview\examples\Wavelet Analysis\WAApplications
    • Integer Wavelet Transform on Image VI: labview\examples\Wavelet Analysis\WAGettingStarted
    • Integer Wavelet Transform on 1D Signal VI: labview\examples\Wavelet Analysis\WAGettingStarted