[R-sig-Geo] Grid of raster: increase resolution

[Komine]

Hi,
When I overlay both layers (raster and its boundary),a part of my boundary
does not display. 
It is possible to resolve this problem by reducing the resolution of my
raster, 
but I don't want to do it. I want to increase the box size of my boundary.
How to increase the extent of my boundary?
I used this code:

# Open raster
>library(raster)   
>test1<-rasterFromXYZ(Image)  
>plot(test1)
>test2<- aggregate(test2,fact=15, fun=mean) 
>plot(test2,axes=FALSE,box=FALSE)                               
# Open Boundary                                           
>library (rgdal) 
>test3<-readOGR(dsn="C",layer="Boundary")
>plot(test3,add=TRUE) 

Thank you in advance

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