Apparatus for detecting marks on documents
November 21, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesOptical reading system System and method for reading marks on a document Halftone picture processing apparatus Apparatus for the automated processing of bulk mail and the like Cutoff control system Apparatus for reading a document and processing the image Error diffusion of overlapping dots Image reader for an image forming apparatus Method of detecting a processing area of a document for an image forming apparatus Apparatus and method for recording and reproducing multi-level information InventorAssigneeApplicationNo. 342897 filed on 11/21/1994US Classes:382/175, Separating document regions using preprinted guides or markings235/386, Voting machine355/45, Reflector in optical path369/176, DYNAMIC MECHANISM SUBSYSTEM382/100, APPLICATIONS382/184, With separate timing or alignment marks382/317Sensor control (e.g., OCR sheet controls copier or fax)ExaminersPrimary: Couso, Jose L.Assistant: Do, Anh Hong Attorney, Agent or FirmInternational ClassG06K 009/34AbstractAn apparatus and method is provided for detecting and sorting a document containing an address change request from a group of documents. The apparatus includes a document transport for conveying the document along a selected path of movement. An image scanner positioned along the selected path is provided for reading an image of the document or of a selected area on the document. The image scanner provides density levels corresponding to discrete areas on the document. An image processor determines a set of density levels corresponding to a test line passing through the selected area on the document. Density level transitions are detected along the selected line when two adjacent areas on the document have substantially different density levels. If a sufficient number of density level transitions are detected along the selected line, the document is sorted from the group of documents.Field of SearchIMAGE SEGMENTATIONSensor control (e.g., OCR sheet controls copier or fax) Document or print quality inspection (e.g., newspaper, photographs, etc.) Separating document regions using preprinted guides or markings With separate timing or alignment marks To distinguish intelligence from background Image portion selection NATURAL COLOR FACSIMILE Image processing Moire reduction Voting machine Reflector in optical path DYNAMIC MECHANISM SUBSYSTEM | |
