| 摘要 |
A combination xerographic/flying spot scanning apparatus wherein xerographic images produced by the xerographic section are scanned following development by the scanning beam of the scanning section to produce image signals or pixels representative of the image scanned. To accommodate changes in the apparatus due to use and wear on the components, a test image is produced in the interdocument area, and following development, scanned by the scanning beam. The signals produced from the test image are utilized to update the threshold level at which image signals produced by the apparatus scanning section are processed.
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