Sliding2D(Op, dims, dimsd, nwin, nover, tapertype='hanning', design=False)¶
2D Sliding transform operator.
Apply a transform operator
Oprepeatedly to patches of the model vector in forward mode and patches of the data vector in adjoint mode. More specifically, in forward mode the model vector is divided into patches each patch is transformed, and patches are then recombined in a sliding window fashion. Both model and data should be 2-dimensional arrays in nature as they are internally reshaped and interpreted as 2-dimensional arrays. Each patch contains in fact a portion of the array in the first dimension (and the entire second dimension).
This operator can be used to perform local, overlapping transforms (e.g.,
pylops.signalprocessing.Radon2D) of 2-dimensional arrays.
The shape of the model has to be consistent with the number of windows for this operator not to return an error. As the number of windows depends directly on the choice of
nover, it is recommended to use
design=Trueif unsure about the choice
dimsand use the number of windows printed on screen to define such input parameter.
- Op :
- dims :
Shape of 2-dimensional model. Note that
dimsshould be multiple of the model size of the transform in the first dimension
- dimsd :
Shape of 2-dimensional data
- nwin :
Number of samples of window
- nover :
Number of samples of overlapping part of window
- tapertype :
Type of taper (
- design :
Print number of sliding window (
True) or not (
- Sop :
Identified number of windows is not consistent with provided model shape (
- Op :