Shifted slice of a padded matrix (the stencil building block).

Given xpad = g_pad(x, h), returns the view of x's shape offset by (dy, dx) pixels, dy/dx in [-h, h]. Rows are y, columns are x.

Usage

g_shift_slice(xpad, dy, dx, out_nrow, out_ncol, h)

Arguments

xpad

Padded matrix.

dy, dx

Integer offsets in pixels.

out_nrow, out_ncol

Dimensions of the unpadded matrix.

h

Pad width used to build xpad.

Value

An out_nrow x out_ncol matrix.