VOI Compression

This compression algorithm is useful for 2D NMR datasets in order to get a denoised spectra:

The VOI Compression widget has the following options:

•Threshold (Noise Factor): it is a decimal value between [0.1, 10.0] that represents the factor that multiplies the noise value of the spectrum (calculated internally by the program). The automatic value is set to 3.0.

•Minimum VOI (Variable of Interest): it is an integer between [1, 100] that represents the minimum number of connected points (surrounding) to considered a point as a valid peak. The automatic value is calculated as the median of the peaks' half width.

•Interactive: if this check box is activated, then the VOI compression in applied any time that the Threshold (and/or Minimum VOI) changes in the widget

The feature is available in the 'Processing/Layout Template' and also from the PCA data preparation.

For further information about this compression algorithm, please check this paper (DOI: 10.1039/C7CC09891J)