extractImagePatchCoordinates: Extract 2-D or 3-D image patch coordinates.

In ANTsX/ANTsRNet: Neural Networks for Medical Image Processing

Extract 2-D or 3-D image patch coordinates.

Description

Extract 2-D or 3-D image patch coordinates.

Usage

extractImagePatchCoordinates(
  image,
  patchSize,
  maxNumberOfPatches = "all",
  strideLength = 1,
  maskImage = NULL,
  physicalCoordinates = TRUE,
  cornerCoordinates = TRUE,
  randomSeed,
  randomize = TRUE
)

Arguments

image	Input ANTs image with one or more components.
patchSize	Width, height, and depth (if 3-D) of patches.
maxNumberOfPatches	Maximum number of patches returned. If "all" is specified, then all patches in sequence (defined by the strideLength are extracted.
strideLength	Defines the sequential patch overlap for maxNumberOfPatches = "all". Can be a image-dimensional vector or a scalar.
maskImage	optional image specifying the sampling region for the patches when maximumNumberOfPatches does not equal "all". The way we constrain patch selection using a mask is by forcing each returned patch to have a masked voxel at its center.
physicalCoordinates	boolean to determine whether indices or spatial coordinates are returned.
cornerCoordinates	boolean to determine whether indices or spatial coordinates of the corner or the center are returned.
randomSeed	integer seed that allows reproducible patch extraction across runs.
randomize	boolean controlling whether we randomize indices when masking.

Value

a matrix of image patch spatial or index coordinates.

Author(s)

Tustison NJ, Avants B

Examples

library( ANTsR )

image <- antsImageRead( getANTsRData( "r16" ) )
maskImage <- getMask( image, 1, 1000 )
patchCoordsP <- extractImagePatchCoordinates( image, c( 32, 32 ), 10, c( 32, 32 ),
  maskImage, randomSeed = 0, physicalCoordinates = TRUE )
patchCoordsI <- extractImagePatchCoordinates( image, c( 32, 32 ), 10, c( 32, 32 ),
  maskImage, randomSeed = 0, physicalCoordinates = FALSE )

ANTsX/ANTsRNet documentation built on Nov. 21, 2024, 4:07 a.m.