title: Image reconstruction from spectral magnitude under a nonnegativity constraint.
abstract: It is shown that a band-limited spectrum of a nonnegative object can be represented as the autoconvolution of a spectrum whose cutoff frequency is half of the band limit. This permits spectral-magnitude-only reconstruction with a nonnegativity constraint without a support constraint. A magnitude-only reconstruction method using a conjugate-gradient procedure is developed and is investigated by computer simulations.
authors.forename: N
authors.initials: N
authors.lastname: Miura
authors.forename: N
authors.initials: N
authors.lastname: Baba