velox (version 0.2.0)

VeloxRaster_col2im: col2im

Description

Assigns values to a VeloxRaster band from a matrix of flattened image patches. Patch frames, as specified by rowframe and rowframe, are not assigned. This function is intended to be used with mat matrices constructed with the im2col function.

Arguments

mat

The matrix of flattened image patches.

wrow

Patch size in the y dimension.

wcol

Patch size in the x dimension.

band

The band to be assigned.

rowframe

A non-negative integer specifying the size of the frame around the image patches in the y dimension.

colframe

A non-negative integer specifying the size of the frame around the image patches in the x dimension.

rowstride

A positive integer denoting the stride between extracted patches in the y dimension.

colstride

A positive integer denoting the stride between extracted patches in the x dimension.

Value

Void.

Examples

# NOT RUN {
## Make VeloxRaster
mat <- matrix(1:100, 10, 10)
vx <- velox(mat, extent=c(0,1,0,1), res=c(0.1,0.1), crs="+proj=longlat +datum=WGS84 +no_defs")
## Apply im2col
patch.mat <- vx$im2col(wrow=2, wcol=2, band=1, padval=0,
                       rowframe=1, colframe=1, rowstride=2, colstride=2)
## Apply col2im
vx$col2im(mat=patch.mat, wrow=2, wcol=2, band=1, rowframe=1, colframe=1, rowstride=2, colstride=2)
isTRUE(all.equal(mat, vx$as.matrix()))

# }