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ptoc( im [, nx, ny, x0, y0])
Transforms image im, which must be a two-dimensional
float or double image, from polar to Cartesian
coordinates, using bicubic interpolation. The first dimension of
im is interpreted as the azimuth, spanning 360 degrees, and
the second dimension as the radius, at a spacing of 1 px. If
nx and ny are specified, then they indicate
the dimensions of the returned image. If they are not specified, then
two less than twice the size of the second dimension of im
is used. If x0 and y0 are specified, then
they indicate the Cartesian coordinates corresponding to the center of
the polar transformation. If they are not specified, then one and a
half less than the size of the second dimension of im is
used.
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