Document Difference Annotation via Bitmap Spatial Indexing
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Solution Overview
Problem
Current methods for comparing original and modified documents, especially those with graphical content, often misidentify differences and are inefficient, making it difficult to track and highlight changes effectively, particularly in large documents with minor modifications.
Innovation Solution
A method that involves converting both documents into bitmaps, identifying difference points based on pixel value changes, and generating annotations by superposing a spatial index and deriving polygon vertices to highlight changes without affecting the underlying content, allowing for easy tracking and visualization of modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If document comparison is performed on original graphical content, then differences can be identified, but the integrity of the underlying content is compromised
Solution Approach 1:
The patent creates a visual copy of the document by rendering it as a bitmap image. This copy serves as the basis for difference detection, allowing comparison operations to be performed on the image data without modifying the original document structure or content integrity.
Solution Approach 2:
The patent introduces annotations as an intermediary layer between the original document and the comparison process. Annotations are graphical markers placed on the rendered bitmap to indicate differences, serving as a mediator that conveys change information without directly altering the source document.
2Measurement precision
If manual review of large documents is performed, then all changes can be detected, but the process is time-consuming and inefficient
Solution Approach 1:
The patent replaces the mechanical process of manual visual inspection with an automated image processing system. By converting documents to bitmaps and using computational algorithms to compare pixel data, the system automatically detects differences without human intervention, dramatically reducing review time while maintaining detection completeness.
Solution Approach 2:
The patent creates visual copies of documents as bitmaps, enabling automated computational comparison. This copy-based approach allows machine processing of document differences, replacing slow manual review with fast automated image analysis while preserving the ability to detect all changes.
3Productivity
If current document comparison methods are used, then differences can be tracked, but misidentification of differences occurs
Solution Approach 1:
The patent replaces unreliable manual or conventional text-based comparison methods with automated bitmap image processing. By comparing rendered visual representations directly, the system achieves more reliable and accurate difference identification, eliminating the misidentification problems that occur with traditional methods.
Solution Approach 2:
The patent changes the fundamental parameter of comparison from text or structured data to bitmap image data. This parameter transformation enables direct visual comparison through pixel analysis, improving reliability by comparing the actual rendered appearance rather than relying on interpretation of document structures or text content.
Data Source
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AI summary
A method for emphasizing differences in graphical appearances between an original document and a modified document is provided in accordance with an aspect of the present invention. The method includes the step of receiving a first bitmap of the modified document, and a second bitmap of the original document. The method includes deriving a set of difference points based upon a comparison of the first bitmap and the second bitmap. The method includes a step of superposing a spatial index onto the set of difference points, and generating polygon vertices from a plurality of adjacent elements of index. Each of the elements has a predetermined density of difference points. The method concludes with generating an annotation from the polygon vertices.