Compress a MRIaggr object

Description

Generate from an existing MRIaggr object a new one with lower spatial resolution.

Usage

## S4 method for signature 'MRIaggr'
constCompressMRIaggr(object, compression.factor, param = NULL,
         mask = NULL, threshold = 0.49, verbose = optionsMRIaggr("verbose"))

Arguments

Details

ARGUMENTS:
Information about the param argument can be found in the details section of initParameter.

FUNCTION:
The fonction uses a local mean to compress the initial parameters maps to a lower resolution.

Value

a MRIaggr object.

Examples

## load a MRIaggr object
data("MRIaggr.Pat1_red", package = "MRIaggr")
 
## compress the MRIaggr object
MRIaggr.compressed <- constCompressMRIaggr(MRIaggr.Pat1_red, compression.factor = 2,
                                           param = c("DWI_t0","T2_FLAIR_t2","MASK_T2_FLAIR_t2"),
                                           mask = "MASK_T2_FLAIR_t2") 

## display
par(mfrow = c(2,4), mar = rep(1.75,4), mgp = c(2,0.75,0))
multiplot(MRIaggr.Pat1_red, param = "DWI_t0", window = NULL, breaks = seq(0,350,1),
             midplane = TRUE, main = "before - slice ")
multiplot(MRIaggr.compressed, param = "DWI_t0", window = NULL, breaks = seq(0,350,1),
             midplane = TRUE, main = "after - slice ")

multiplot(MRIaggr.Pat1_red, param = "MASK_T2_FLAIR_t2", main = "before - slice ")
multiplot(MRIaggr.compressed, param = "MASK_T2_FLAIR_t2", main = "after - slice ")

Results

R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

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Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> library(MRIaggr)
Loading required package: Rcpp
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/MRIaggr/MRIaggr-constCompressMRIaggr.Rd_%03d_medium.png", width=480, height=480)
> ### Name: constCompressMRIaggr
> ### Title: Compress a MRIaggr object
> ### Aliases: constCompressMRIaggr constCompressMRIaggr,MRIaggr-method
> ### Keywords: methods
> 
> ### ** Examples
> 
> ## load a MRIaggr object
> data("MRIaggr.Pat1_red", package = "MRIaggr")
>  
> ## compress the MRIaggr object
> MRIaggr.compressed <- constCompressMRIaggr(MRIaggr.Pat1_red, compression.factor = 2,
+                                            param = c("DWI_t0","T2_FLAIR_t2","MASK_T2_FLAIR_t2"),
+                                            mask = "MASK_T2_FLAIR_t2") 
slice : 1 2 3 
constCompressMRIaggr[MRIaggr] : MRIaggr has been compressed from (x, y) = 78 100
                                                              to (x, y) = 39 50
> 
> ## display
> par(mfrow = c(2,4), mar = rep(1.75,4), mgp = c(2,0.75,0))
> multiplot(MRIaggr.Pat1_red, param = "DWI_t0", window = NULL, breaks = seq(0,350,1),
+              midplane = TRUE, main = "before - slice ")
> multiplot(MRIaggr.compressed, param = "DWI_t0", window = NULL, breaks = seq(0,350,1),
+              midplane = TRUE, main = "after - slice ")
> 
> multiplot(MRIaggr.Pat1_red, param = "MASK_T2_FLAIR_t2", main = "before - slice ")
> multiplot(MRIaggr.compressed, param = "MASK_T2_FLAIR_t2", main = "after - slice ")
> 
> 
> 
> 
> 
> dev.off()
null device 
          1 
>