Scan line compressed facsimile communication system
OwnerWilliam Joseph Kuznicki, Robert John Schwendeman +1inventors
InventorsWilliam Joseph Kuznicki, Robert John Schwendeman, Gregg Edward Rasor
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Abstract
A selective call receiver includes a receiver (103), a controller (105), and a display (113) for presenting a recovered source document. The receiver (103) provides a received paging message that was generated from the facsimile message of the original source document (208). The received paging message is interpreted and decoded by the controller (105). Using the display (113), a decoded scan line compressed document (1101) is presented in a format that substantially resembles the facsimile message of the original source document (1100).
Claims54
A method for generating a scan line compressed facsimile message of a quantized image of a source document comprising the steps of:
- analyzing the quantized image to locate at least first and second information regions;
- determining a height in scan lines of each of the at least first and second information regions;
- calculating a scan discard ratio R:1 for at least one of the at least first and second information regions, the scan discard ratio R:1 being a function of at least a vertical dimension limit Y that is a product of a vertical line density associated with the source document and a system loading factor f, and the height in scan lines corresponding with the at least one of the first and second information regions;
- and
- discarding R scan lines in the at least one of the first and second information regions.
A method for reconstructing a scan line compressed facsimile message of a quantized image of a source document comprising the steps of:
- recovering a scan discard ratio R corresponding with at least one of at least first and second information regions contained in the compressed facsimile message;
- filling at least one first region with information corresponding with at least one of at least first and second information regions contained in the compressed facsimile message, the at least one first region residing in at least a first area having vertically aligned pels between a reference scan line and an adjacent scan line;
- adding missing pels in at least one second region between the reference scan line and the adjacent scan line lacking vertically aligned pels;
- and
- repeating the filling and adding steps until all discarded scan lines in the at least one of the at least first and second information regions are reconstructed.
A communication controller that generates a scan line compressed facsimile message of a quantized image of a source document for transmission in a selective call facsimile system, comprising:
- a compression processor that assembles a scan line compressed document, the scan line compressor operating to analyze the quantized image to locate at least first and second information regions, determine a white space ratio between the at least first and second information regions, rotate the quantized image of the source document until the white space ratio between the at least first and second information regions is maximized, resulting in an optimally rotated image of the source document, save a rotation factor corresponding with an angle of rotation associated with the optimally rotated image of the source document, determine a height in scan lines of each of the at least first and second information regions in the optimally rotated image of the source document, calculate a scan discard ratio R:1 for at least one of the at least first and second information regions;
- and discard R:1 scan lines in the at least one of the first and second information regions.
A selective call receiver for receiving a scan line compressed facsimile message, comprising:
- a receiver that receives a selective call message comprising a scan line compressed document;
- and
- a scan line compressed facsimile decoder that decodes the scan line compressed document for presentation, the scan line compressed facsimile decoder operating to recover a scan discard ratio R corresponding with at least one of at least first and second information regions contained in the compressed facsimile message;
- fill at least one first region with information corresponding with at least one of at least first and second information regions contained in the compressed facsimile message, the at least one first region residing in at least a first area having vertically aligned pels between a reference scan line and an adjacent scan line;
- add missing pels in at least one second region between the reference scan line and the adjacent scan line lacking vertically aligned pels;
- and repeat the fill and add operations until discarded scan lines in the at least one of the at least first and second information regions are reconstructed.
Dependencies are inferred from the claim text.