Position Location Coding Pattern for Digital Pen Error Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional encoded paper and decoding techniques are not adequately resistant to errors such as dust or stray markings, especially when using a small field of view, which affects the accuracy of position location in digital pen systems.
Innovation Solution
A two-dimensional position-location coding pattern is developed that allows identification of position even under arbitrary rotation and with errors, using a 5×5 field of view, with each region containing page, row, and column numbers, and additional error-correction information, enabling correction of detection errors and maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional encoding patterns are used with a small field of view, then the device complexity is reduced, but the reliability of position location deteriorates due to errors from dust or stray markings
Solution Approach 1:
The encoding pattern is divided into multiple independent regions, each containing position information for a specific area of the paper. This segmentation allows the system to focus on a small field of view containing one or more regions while maintaining overall reliability through the distributed nature of the encoding across the entire paper surface.
Solution Approach 2:
Error correction information is pre-encoded into each region along with the position data. This preliminary inclusion of redundancy allows the system to correct for errors caused by dust or stray markings without requiring complex additional processing, maintaining both low device complexity and high reliability.
2Reliability
If error correction information is added to each region, then the reliability of position location improves, but the manufacturing precision of the encoding pattern deteriorates
Solution Approach 1:
Each region contains error correction information specifically tailored to that local area, allowing for localized encoding and decoding operations. This local quality approach means that errors in one region do not affect other regions, and the error correction can be applied without requiring perfect manufacturing precision across the entire paper surface.
Solution Approach 2:
The encoding pattern uses variable parameters within each region, such as different patterns or symbols to represent position information and error correction data. This parameter variation allows the system to accommodate manufacturing variations while maintaining reliable position location through the error correction capabilities built into each region.
3Adaptability or versatility
If the encoding pattern is designed to work with arbitrary rotation, then the adaptability of the system improves, but the measurement precision of position location deteriorates
Solution Approach 1:
The encoding pattern is designed with universal characteristics that allow it to be recognized and decoded regardless of rotation angle. Each region contains features that can be identified in multiple orientations, enabling the system to adapt to arbitrary rotation while maintaining position location precision through consistent decoding algorithms that work across all rotations.
Solution Approach 2:
The encoding pattern incorporates asymmetric elements within each region that provide orientation information. These asymmetric features allow the system to determine the correct orientation of each region even when the overall paper is rotated, thereby maintaining measurement precision while achieving adaptability to arbitrary rotation angles.
Data Source
AI summary
Provided are codes that may be applied to a sheet of paper or other surface, as well as techniques for decoding such codes. Using such codes and decoding techniques permits identification of the position of a pen (e.g., a digital pen) on the paper or other surface, by observing only a small field of the surface. Moreover, the position often can be identified even in the presence of arbitrary rotation and certain errors (e.g., due to dust or stray markings on the paper).