Produces an estimate of the multiscale variance with approximate confidence intervals using the 2D MODWT.
wave.variance.2d(x, p = 0.025)
Data frame with 3J+1 rows.
image
(one minus the) two-sided p-value for the confidence interval
B. Whitcher
The wavelet variance is basically the average of the squared wavelet coefficients across each scale and direction of an image. As shown in Mondal and Percival (2012), the wavelet variance is a scale-by-scale decomposition of the variance for a stationary spatial process, and certain non-stationary spatial processes.
Mondal, D. and D. B. Percival (2012). Wavelet variance analysis for random fields on a regular lattice. IEEE Transactions on Image Processing 21, 537–549.