Python Sparse data Analysis Package external MRI plugin.

Reweighting optimisation strategies.

class mri.optimizers.utils.reweight.mReweight(weights, linear_op, thresh_factor=1)[source]¶

Ming reweighting.

This class implements the reweighting scheme described in Ming2017.

Parameters

weights: ndarray

Array of weights

linear_op: pysap.numeric.linear.Wavelet

A linear operator.

thresh_factor: float, default 1

Threshold factor: sigma threshold.

reweight(x_new)[source]¶

Updat the weights.

Parameters

x_new: ndarray

the current primal solution.

Returns

sigma_est: ndarray

the variance estimate on each scale.