PDF Printing Error Recovery via Page Segmentation
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Solution Overview
Problem
Current PDF printing technologies terminate the printing process when encountering corrupted pages, failing to print non-corrupt pages and not allowing users to correct and reprint only the corrupted ones, leading to resource wastage and incomplete information retrieval.
Innovation Solution
A method that rasterizes and prints non-corrupt pages while identifying and separating corrupted pages, allowing for their correction and subsequent merging with previously printed non-corrupt pages, enabling selective reprinting of corrected pages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the printing process processes the whole document as a complete job, then the printing process is simple and continuous, but the process terminates when encountering corrupted pages, preventing non-corrupt pages from being printed
Solution Approach 1:
The patent segments the PDF document into individual pages, allowing the printing system to process each page independently. When a corrupted page is encountered, the system identifies and skips only that specific page while continuing to print subsequent non-corrupt pages. This segmentation enables partial document printing rather than complete job termination, directly resolving the contradiction between maintaining process simplicity and achieving higher printing completion rates.
2Ease of operation
If the application processes the job as a whole document before extracting specified pages, then page range selection is supported, but error termination still occurs before page extraction
Solution Approach 1:
The patent performs preliminary identification and marking of corrupted pages during the initial document analysis phase, before the actual printing execution. This preliminary action allows the system to pre-determine which pages can be printed and which should be skipped, enabling both page range selection functionality and error tolerance without requiring complete re-processing during the printing phase.
3Productivity
If direct print method is used without print application or printer driver, then the printing process is direct and efficient, but the PDL still terminates rendering due to corrupted pages
Solution Approach 1:
The patent implements a feedback mechanism where the printing system continuously monitors the rendering status of each page and receives feedback about corruption errors. When corruption is detected in a direct print scenario, the system uses this feedback to skip the problematic page and continue rendering subsequent pages, thereby maintaining high printing efficiency while improving rendering completeness through error recovery.
4Reliability
If all pages including corrupted ones are reprinted after correction, then complete document integrity is achieved, but resource wastage occurs from reprinting already-printed non-corrupt pages
Solution Approach 1:
The patent applies the discarding and recovering principle by identifying and discarding (skipping) only the corrupted pages during the printing process, while recovering and preserving the already-printed non-corrupt pages. When a corrected PDF is submitted for reprinting, the system recovers the previously successful print outputs and combines them with the newly printed corrected pages, thereby achieving complete document integrity without wasteful reprinting of intact pages.
Data Source
AI summary
A method for print portable document format (PDF) files with corrupted pages, comprising the steps of rasterizing images of non-corrupt pages but not corrupted pages of a PDF file, printing only non-corrupt pages of the PDF file, gathering and recording file and page information including which pages are non-corrupt pages and which pages are corrupted pages in the PDF file, allowing correction of the corrupted pages of the PDF file for reprint, retrieving saved file and page information for reprint of the PDF file. Based on the file and page information retrieved and print options and merge mode selected, the reprint process proceeds with rasterizing images of the corrected corrupted pages, and printing the corrected corrupted pages while merging with the already-printed non-corrupt pages to produce a complete set of print out of all non-corrupt pages and corrected corrupted pages of the PDF file in a correct sequence according to the file and page information retrieved.