Visual Reference Tags Using Colored Hexagons
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Solution Overview
Problem
Existing visual identification systems, such as barcodes and 2D matrix codes, face challenges in reliably reading and decoding information from moving objects under varying illumination conditions and at a distance, especially when multiple tags are present in a camera's field of view, and require specialized infrastructure and equipment.
Innovation Solution
The development of visual reference tags using a central hexagonal cell surrounded by colored hexagons, employing graph coloring strategies and hue histogram matching for robust target acquisition, allowing identification through low-resolution digital cameras without additional infrastructure, and enabling error correction and aesthetic design for efficient decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If barcodes or 2D matrix codes are used for identification, then information can be encoded and stored, but they become difficult to read at a distance and require proper orientation
Solution Approach 1:
The patent uses colored hexagons instead of traditional black-and-white patterns. Each hexagon's color encodes information, allowing the tag to be read from greater distances and at various orientations without requiring precise alignment, thus resolving the contradiction between information storage and reading difficulty
Solution Approach 2:
The invention transitions from 1D barcodes to 2D matrix codes with colored hexagons arranged in a honeycomb pattern. This dimensional expansion increases information capacity while the color dimension provides additional encoding capability, enabling reliable detection at distance without requiring strict orientation
2Measurement precision
If 2D matrix codes with anchors are used for registration, then tag location can be determined, but they fail under changing illumination conditions and when targets are distant
Solution Approach 1:
The patent changes the physical parameters of the tag by using colored hexagons with distinct chromatic properties. The hue histogram of these colors remains stable under varying illumination conditions, providing reliable feature extraction for tag location and identification even when targets are distant or lighting changes, thus resolving the contradiction between measurement precision and reliability
3Length of stationary object
If visual reference tags are made larger to be captured from distance, then detection range increases, but storage capacity is restricted
Solution Approach 1:
The patent employs colored hexagons where each color carries encoded information. This color-based encoding dramatically increases the information density per unit area, allowing the tag to maintain a compact size while still providing sufficient storage capacity for distant detection applications, thus resolving the contradiction between tag size and storage capacity
Solution Approach 2:
The invention combines multiple hexagons of different colors in a structured honeycomb pattern. This composite structure allows information to be distributed across multiple colored units, increasing overall storage capacity without proportionally increasing the physical tag size, thereby resolving the contradiction between detection range requirements and information storage
4Loss of information
If RFID tags are used for identification, then information storage and access control are improved, but additional expensive infrastructure and equipment are required
Solution Approach 1:
The patent creates a visual copy of information that can be captured by standard digital cameras. Instead of requiring specialized RFID readers and infrastructure, the system uses widely available camera devices to read the colored hexagon tags, eliminating the need for expensive dedicated infrastructure while maintaining information storage and retrieval capabilities, thus resolving the contradiction between information storage and device complexity
Solution Approach 2:
The invention makes the identification system universal by using standard digital cameras that most people already possess. The colored hexagon tags can be read by any device with a color camera, eliminating the need for proprietary RFID infrastructure and making the system accessible and cost-effective, thereby resolving the contradiction between information storage capabilities and infrastructure requirements
Data Source
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AI summary
A visual Reference tag is formed from an array of cells, wherein each cell is visually distinct from all other cells in a given neighborhood and each of said cells contains a single visual cue, for example a unique color, selected from a finite number of visual cues.