title: Grating coding for image subtraction with uneven bar widths.
abstract: A discussion is presented of the main features of grating coding when the encoder ruling has unequal widths in clear and dark bars. It is shown that the use of such a grating does not alter difference information. Alterations occur on the addition information. The validity of this analysis for the partially coherent case is shown.
authors.forename: G
authors.initials: G
authors.lastname: Rodríguez