Marker Visibility Occlusion Evaluation for Position Detection
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Solution Overview
Problem
Existing technologies face challenges in accurately obtaining positional information of a target object using markers, as recognition accuracy is affected by changes in the marker's image due to factors other than the target object's movement, leading to instability and increased design and manufacturing costs.
Innovation Solution
An information processing device and method that extract images of markers from a photographed image, determine valid position coordinates by evaluating visibility occlusion, and calculate the target object's position using valid coordinates, integrating data from an IMU sensor to stabilize accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a marker of known shape is used for recognition, then distinction from other objects and processing efficiency are improved, but recognition accuracy is greatly affected when the marker image changes due to factors other than target object movement
Solution Approach 1:
The patent applies dynamics by making the marker spherical, which maintains a consistent circular image profile regardless of orientation. This dynamic adaptability to rotation while maintaining shape consistency resolves the contradiction by allowing efficient recognition without accuracy degradation from orientation changes
Solution Approach 2:
The patent changes the marker shape parameter to a sphere, which has the unique property that its projection remains a circle from any angle. This parameter change enables the marker to maintain recognition accuracy while allowing free rotation, thus improving processing efficiency without sacrificing precision
2Measurement precision
If the marker is made spherical or multiple dot-shaped markers are provided to stabilize accuracy, then recognition accuracy is stabilized, but design freedom and manufacturing cost increase
Solution Approach 1:
By making the marker spherical, the system achieves orientation-independent recognition without requiring multiple markers. This single dynamic solution maintains accuracy while simplifying manufacturing compared to multiple static markers
Solution Approach 2:
The patent merges multiple potential marker functions into a single spherical marker that provides both orientation independence and sufficient recognition capability, eliminating the need for multiple separate markers and reducing manufacturing complexity
3Device complexity
If all marker position coordinates are used for target object position calculation, then processing is simplified, but accuracy is affected by occluded or invalid markers
Solution Approach 1:
The patent extracts and removes invalid marker data from the calculation set by evaluating visibility and occlusion. This selective extraction ensures that only valid, unoccluded markers contribute to position calculation, maintaining accuracy without requiring complex validation systems
Solution Approach 2:
The patent implements feedback by continuously evaluating marker visibility and occlusion status, then adjusting which markers are used for calculation. This feedback loop maintains position detection accuracy by adapting to changing occlusion conditions while keeping processing relatively simple
Data Source
AI summary
An information processing device disposes an object model of a target object in a virtual space, and projects a polygon of a marker onto an imaging plane. Visibility indicating a degree of occlusion of the marker is calculated from an area of an image of the marker on a model thereby obtained and an area of a corresponding image of the marker in a photographed image. When the visibility is equal to or higher than a threshold value, positional information of the marker which positional information is derived from the photographed image is determined to be valid, and is output to be used in calculation of position coordinates of the target object after a weight coefficient is determined. When the visibility is lower than the threshold value, the positional information of the marker is determined to be invalid, and is not output.