MRIaggr-initFilter: Initialization of a filter

In bozenne/MRIaggr: Management, Display, and Processing of Medical Imaging Data

Description

Return a filter corresponding to the specified name.

Usage

initFilter(filter, method)

Arguments

filter	the filter to be initialized. character. REQUIRED.
method	the name of the function that called the initializer. character.

Details

ARGUMENTS :
filter refers to classical filters that will be constructed by the function:
The first two characters refer to the dimension of the filter : "2D" or "3D".
The third character must be "_".
The fourth character refers to the type of filter among : "M", "G", "S" or "I" :

• "M" : median filter (by default a weight of 1 is attributed to each site)

• "G" : gaussian filter (sites are weight with a gaussian kernel)

• "S" : sobel filter (gradient in the i, j or k direction)

• "I" : influence filter (sites with distance to the central site inferior or equal to sqrt(p) have weight 1, otherwise 0)

The last one or two characters indicates the size p of the filter except for the sobel filter where it indicates the direction of the gradient ("x", "y" or "z")

Value

A list were :

• [[filter]] : contains the filter. matrix of dimension p*p or array of dimension p*p*p.

• [[filter_split]] : contains the decomposition of the filter name. character vector.

Examples

initFilter("2D_G3", method = "calcFilter")$filter
initFilter("2D_G5", method = "calcFilter")$filter
initFilter("3D_G3", method = "calcFilter")$filter

initFilter("2D_M9", method = "calcFilter")$filter
initFilter("3D_M3", method = "calcFilter")$filter

initFilter("2D_Sx", method = "calcFilter")$filter
initFilter("2D_Sy", method = "calcFilter")$filter
initFilter("3D_Sx", method = "calcFilter")$filter
initFilter("3D_Sz", method = "calcFilter")$filter

initFilter("2D_I3", method = "calcFilter")$filter
initFilter("2D_I5", method = "calcFilter")$filter
initFilter("2D_I7", method = "calcFilter")$filter
initFilter("2D_I9", method = "calcFilter")$filter
initFilter("3D_I5", method = "calcFilter")$filter

bozenne/MRIaggr documentation built on May 13, 2019, 1:39 a.m.