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`ptoc( `

`im` [, `nx`, `ny`, `x0`, `y0`])

Transforms image

, which must be a two-dimensional
`im``float`

or `double`

image, from polar to Cartesian
coordinates, using bicubic interpolation. The first dimension of

is interpreted as the azimuth, spanning 360 degrees, and
the second dimension as the radius, at a spacing of 1 px. If
`im`

and `nx`

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 `ny`

is used. If `im`

and `x0`

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 `y0`

is
used.
`im`

Reverse: ctop