| 摘要 |
A system for sorting mailing pieces is described in which pre-addressed labels are applied to mailing pieces and in which selected labels bearing indicia representative of a zip code group are selectively coated to identify them from labels not bearing such indicia. To distinguish coated labels from non-coated labels, each label is considered as having two or more portions, including a first coatable portion and a second reference portion. Only labels bearing zip code group indicia receive a coating on their coatable portions. Thereafter, each label is examined to detect the level of radiation, if any, emitted from its coatable and reference portions. If the level of radiation emitted from a coatable portion of a label exceeds the level of radiation emitted from its reference portion by at least a predetermined difference, such a label is identified as bearing indicia representative of a zip code group.
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