o # i`@s\ddlmZddlZddlmZddlmZmZddlm Z m Z ddddZ ddddZ dS)) annotationsN)NdarrayOrTensor)fftn_centered_tifftn_centered_t)convert_data_typeconvert_to_dst_typeTkspr spatial_dimsint is_complexboolreturncC2t|tj^}}t|||d}t||d^}}|S)a Pytorch-based ifft for spatial_dims-dim signals. "centered" means this function automatically takes care of the required ifft and fft shifts. This function calls monai.networks.blocks.fft_utils_t.ifftn_centered_t. This is equivalent to do fft in numpy based on numpy.fft.ifftn, numpy.fft.fftshift, and numpy.fft.ifftshift Args: ksp: k-space data that can be 1) real-valued: the shape is (C,H,W) for 2D spatial inputs and (C,H,W,D) for 3D, or 2) complex-valued: the shape is (C,H,W,2) for 2D spatial data and (C,H,W,D,2) for 3D. C is the number of channels. spatial_dims: number of spatial dimensions (e.g., is 2 for an image, and is 3 for a volume) is_complex: if True, then the last dimension of the input ksp is expected to be 2 (representing real and imaginary channels) Returns: "out" which is the output image (inverse fourier of ksp) Example: .. code-block:: python import torch ksp = torch.ones(1,3,3,2) # the last dim belongs to real/imaginary parts # output1 and output2 will be identical output1 = torch.fft.ifftn(torch.view_as_complex(torch.fft.ifftshift(ksp,dim=(-3,-2))), dim=(-2,-1), norm="ortho") output1 = torch.fft.fftshift( torch.view_as_real(output1), dim=(-3,-2) ) output2 = ifftn_centered(ksp, spatial_dims=2, is_complex=True) r r srcdst)rtorchTensorrr)rr r Zksp_t_out_toutrV/home/dell461/cl/sdc2/last_ska_mid/HISourceFinder-master-l/src/monai/data/fft_utils.pyifftn_centeredrimcCr)as Pytorch-based fft for spatial_dims-dim signals. "centered" means this function automatically takes care of the required ifft and fft shifts. This function calls monai.networks.blocks.fft_utils_t.fftn_centered_t. This is equivalent to do ifft in numpy based on numpy.fft.fftn, numpy.fft.fftshift, and numpy.fft.ifftshift Args: im: image that can be 1) real-valued: the shape is (C,H,W) for 2D spatial inputs and (C,H,W,D) for 3D, or 2) complex-valued: the shape is (C,H,W,2) for 2D spatial data and (C,H,W,D,2) for 3D. C is the number of channels. spatial_dims: number of spatial dimensions (e.g., is 2 for an image, and is 3 for a volume) is_complex: if True, then the last dimension of the input im is expected to be 2 (representing real and imaginary channels) Returns: "out" which is the output kspace (fourier of im) Example: .. code-block:: python import torch im = torch.ones(1,3,3,2) # the last dim belongs to real/imaginary parts # output1 and output2 will be identical output1 = torch.fft.fftn(torch.view_as_complex(torch.fft.ifftshift(im,dim=(-3,-2))), dim=(-2,-1), norm="ortho") output1 = torch.fft.fftshift( torch.view_as_real(output1), dim=(-3,-2) ) output2 = fftn_centered(im, spatial_dims=2, is_complex=True) rr)rrrrr)rr r Zim_trrrrrr fftn_centered<rr)T)rrr r r r r r)rrr r r r r r) __future__rrmonai.config.type_definitionsr!monai.networks.blocks.fft_utils_trrmonai.utils.type_conversionrrrrrrrrs   '