US 8,015,489 B2Granted

Method for adding marks in the page rasterizing process

AssigneesPeking University Founder Group Co., Ltd., Beijing Founder Electronics Co., Ltd., Peking University

InventorsWeiping Huang, Junje Kang

Life of this patent

Estimating the term…

Loading patent…

Abstract

This invention relates to the field of computer image processing technology, particularly, to a method for adding marks in the process of page rasterizing, which in detail is the method for adding marks on the output medium when description files of pages are output in raster imaging devices. The description files of pages are generally PostScript file, i.e. PS file, and Portable Document Format (PDF) files, i.e. PDF file. The prior art has disadvantages of poor compatibility, slow speed and the like. The present recognizes adding various marks to description files of pages in the process of page rasterizing in an RIP, thereby it is possible to add marks to any of PS files and PDF files without pre-scanning the description files of pages, and obtain good flexibility and compatibility substantially without effects on speed.

Claims4

Dependent claims

A method for adding marks in a process of page rasterizing, comprising:

(1) inputting a job file in PostScript or Portable Document Format (PDF) to a Raster Image Processor (RIP);
(2) computing enlargements of a page after the marks are added to the job file and generating a description file of the marks in light of types of the marks selected by a user;
(3) switching an execution environment to execute the description file of the marks after a page of the job file is interpreted by the RIP so that the marks are added and incorporated into a content of the page;
and
(4) switching the execution environment of the RIP back after executing the description file of the marks, so as to proceed to interpret and execute the next page;
wherein adding the marks in the step (3) is conducted in a process of page rasterizing inside the RIP and the marks are positioned in light of a size of an original page,
wherein the description file of the marks in the step (2) is a PostScript file and a protective mechanism is used when a status of the RIP is switched between executing the job file and executing the PostScript description file of the marks in the steps (3) and (4), and
wherein the protective mechanism comprises steps of:
(1′) pushing a system dictionary “systemdict”, a global dictionary “globaldict” and a user dictionary “userdict” defined in a PostScript language standard into a dictionary stack of a kernel of the RIP;
(2′) executing a saving operator “save” defined in the standard;
(3′) executing an initialization graphics state operator “initgraphics” defined in the standard;
(4′) setting an origin of a current coordinate at a bottom left corner of the page of the job file to which the marks have been added, wherein a unit of 1/72.0 inch and directions of the coordinate are consistent with those of a default coordinate defined in the standard;
(5′) setting a current clipping as the page of the job file to which the marks have been added;
(6′) setting a current point as the point of the bottom left corner of the page of the job file to which the marks have been added and setting a current path as “empty”;
(7′) pushing parameters into an operand stack of the kernel of the RIP, wherein, if the job file is a composite file, the parameters include the size of the original page before adding the marks and Boolean quantity “false”, and if the job file is a color pre-separation file, the parameters include the size of the original page before adding the marks, a current processed color plate name string and the Boolean quantity “true”;
(8′) interpreting and executing the PostScript description file of the marks;
(9′) executing a restoration operator “restore” defined in the standard;
(10′) popping the user dictionary “userdict”, the global dictionary “globaldict” and the system dictionary “systemdict” out from the dictionary stack;
and
(11′) executing sequentially the next page of the job file.

17 more elements

A method of adding marks in a process of page rasterizing, comprising:

(1) inputting a job file in a format of PostScript or Portable Document Format (PDF) to a Raster Image Processor (RIP);
(2) computing a size of a mark region of a page after the marks are added to the job file and generating a description file of the marks in light of types of the marks selected by a user;
(3) switching an execution environment of the RIP to execute the description file of the marks after the page of the job file is interpreted by the RIP so that the marks are added and incorporated into a content of the page;
and
(4) switching the execution environment of the RIP to process a next page of the job file after executing the description file of the marks;
wherein the addition of the marks in operation (3) is performed in a process of page rasterizing inside the RIP, and the marks are positioned in light of a size of an original page,
wherein the description file of the marks in the operation (2) is a PostScript file,
wherein the method further comprises using a protective mechanism when a status of the RIP is switched between executing the job file and executing the PostScript description file of the marks in the operations (3) and (4), and
wherein the protective mechanism comprises:
(1′) pushing a system dictionary “systemdict,” a global dictionary “globaldict,” and a user dictionary “userdict” defined in a PostScript file language standard into a dictionary stack of a kernel of the RIP;
(2′) executing a saving operator “save” defined in the standard;
(3′) executing an initialization graphics state operator “initgraphics” defined in the standard;
(4′) setting an origin of a current coordinate at a bottom left corner of the page of the job file to which the marks have been added, wherein a unit of 1/72.0 inch and directions of the coordinate are consistent with those of a default coordinate defined in the standard;
(5′) setting a current clipping as the page of the job file to which the marks have been added;
(6′) setting a current point as the point of the bottom left corner of the page of the job file to which the marks have been added and setting a current path as “empty”;
(7′) pushing parameters into an operand stack of the kernel of the RIP, wherein, if the job file is a composite file, the parameters include the size of the original page before adding the marks and Boolean quantity “false”, and if the job file is a color pre-separation file, the parameters include the size of the original page before adding the marks, a current processed color plate name string and the Boolean quantity “true”;
(8′) interpreting and executing the PostScript file description file of the marks;
(9′) executing a restoration operator “restore” defined in the standard;
(10′) popping the user dictionary “userdict,” the global dictionary “globaldict,” and the system dictionary “systemdict” out from the dictionary stack;
and
(11′) executing sequentially the next page of the job file.

18 more elements

Dependencies are inferred from the claim text.