Position estimation device and marker member for position estimation device

JP2026046315APending Publication Date: 2026-03-13HITACHI CHANNEL SOLUTIONS CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-09-02
Publication Date
2026-03-13

AI Technical Summary

Technical Problem

Existing position estimation technologies for mobile robots, such as inkjet robots, security robots, and transport robots, face challenges in accurately estimating their position and orientation due to decreased image resolution at larger distances, leading to position errors.

Method used

A position estimation device utilizing a marker member with retroreflective parts arranged in a predetermined relationship, a camera with a light emitter, and a calculation unit that analyzes the image to estimate position and orientation by calculating approximate straight lines through these retroreflective parts, even at large distances.

Benefits of technology

Enables accurate estimation of the camera's position and orientation, reducing errors and improving estimation accuracy even at larger distances by utilizing the brightness distribution of retroreflective parts.

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Abstract

To provide a position estimation device and a marker member that can estimate position with high accuracy. [Solution] The position estimation device 1 comprises a marker member 2 having a plurality of retroreflective parts 220 arranged in a predetermined positional relationship, a camera 330 having a light emitter 340, and a calculation unit that analyzes images of the marker member captured by the camera to estimate the position. The calculation unit calculates approximate straight lines L1 to L4 passing through each retroreflective part based on the brightness distribution of the images of each retroreflective part included in the captured image, and estimates the position and orientation of the camera using the intersection points P1 to P4 of the calculated approximate straight lines.
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Citation Information

Patent Citations

  • Camera calibration device, method, and program

    JP2022053629A