Facsimile and static presentation processing – Static presentation processing – Communication
Reexamination Certificate
1997-12-19
2001-07-17
Mancuso, Joseph (Department: 2624)
Facsimile and static presentation processing
Static presentation processing
Communication
C358S001140, C358S001160
Reexamination Certificate
active
06262806
ABSTRACT:
BACKGROUND
The invention relates to converting one page description representation of a document into another page description representation. More specifically, a method and device to convert a page sequential representation into a page independent representation is described.
Digitally stored documents are often represented in an output-device independent language known as a page description language (PDL). Well known PDLs include the POSTSCRIPT language and the PORTABLE DOCUMENT FORMAT (PDF) language. Both POSTSCRIPT and PORTABLE DOCUMENT FORMAT are trademarks of Adobe Systems Incorporated, San Jose, Calif. In a PDL representation, a document may be described as lists of instructions and resources. Instructions, for example, include commands to draw a line between two points or to fill a region with a specified color. Resources, for example, include images (raster representations of displayable objects), color spaces, and font specifications.
Page sequential PDL representations are characterized by the fact that a resource used on page N may have been specified/defined on a prior page. In these situations, only a reference to the earlier specification is made on page N. This characteristic makes the document representation relatively compact because resources are not duplicated at every point in the file they are used. It also means that, in general, page N cannot be output (e.g., printed or displayed on a display screen) without first processing all (N−1) prior pages. POSTSCRIPT is a page sequential representation.
In a page independent PDL representation, every page that uses a resource has sufficient information to locate the resource in the file without processing preceding pages of the file. This allows any page in a document represented in a page independent PDL to be printed independently of any other page in the document. PDF is a page independent representation. It is the page independent characteristic of the PDF representation that is exploited in high-speed print environments.
SUMMARY
Generally, the invention provides apparatus and methods to convert a page sequential representation of a document to a page independent representation using sidelining. Sidelining is the process of storing an object, represented in the page sequential representation, in an external file, represented in the page independent representation, while continuing to process the page sequential file. The use of sideling can speed output generation and conserve memory usage when converting a page sequential representation of a document to a page independent representation.
REFERENCES:
patent: 5634091 (1997-05-01), Sands et al.
patent: 5781714 (1998-07-01), Collins et al.
patent: 5881212 (1999-03-01), Morita
PostScript Language Reference Manual, second ed.,Addison-Wesley Publishing Company, 1990. (Table of Contents Only).
Portable Document Format Reference Manual, version 1.2,Adobe Systems Incorporated, 1996. (Table of Contents Only).
Adobe Systems Incorporated
Fish & Richardson P.C.
Mancuso Joseph
Tran Douglas
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