Work Machine Calibration System Coordinate Conversion
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Solution Overview
Problem
Existing calibration systems for work machines fail to convert the position information detected by position detectors into different coordinate systems, limiting their ability to determine object positions on a globe accurately.
Innovation Solution
A calibration system and method that utilize a processing unit to obtain conversion information by combining position information from multiple detectors, allowing the conversion of detected positions from one coordinate system to another, using a first position information item and a second position information item obtained in different postures of the work machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a position detector is used to detect object position in work machine coordinate system, then position detection capability is provided, but the ability to determine object position on globe is limited due to inability to convert between coordinate systems
Solution Approach 1:
The patent introduces a calibration system that acts as an intermediary between the position detector and the coordinate conversion function. The calibration system captures images of a calibration object with known geometry and uses these images to compute transformation parameters that enable conversion between the position detector's coordinate system and the globe coordinate system, thereby bridging the capability gap without modifying the position detector itself
Solution Approach 2:
The patent performs calibration as a preliminary action before actual position detection operations. By pre-establishing the coordinate transformation relationship through calibration object imaging and parameter computation, the system prepares the necessary conversion information in advance, allowing subsequent position detections to be accurately converted to globe coordinates without real-time computational overhead
2Measurement precision
If calibration is performed using image capturing device only, then position detection is enabled, but conversion to different coordinate systems is not achieved
Solution Approach 1:
The patent segments the calibration process into distinct functional components: image capturing of the calibration object, extraction of position information from images, computation of transformation parameters, and storage of conversion information. This segmentation allows each component to be optimized independently and ensures that coordinate system conversion information is explicitly generated and preserved as a separate output
3Ease of operation
If position information is detected in single posture, then detection simplicity is maintained, but conversion accuracy to different coordinate systems deteriorates
Solution Approach 1:
The patent employs periodic action by capturing images of the calibration object from multiple different postures or positions. This periodic variation in imaging conditions provides diverse geometric constraints that enable more accurate computation of transformation parameters, improving coordinate conversion accuracy while maintaining a systematic and repeatable calibration procedure
Data Source
AI summary
A calibration method includes: detecting a predetermined position of a work machine according to first and second methods in a different posture of the work machine; and obtaining a conversion information item used to convert a position detected by the first method from a coordinate system in the first method into a coordinate system different from that of the first method or obtaining a conversion information item used to convert a position detected by the second method from a coordinate system of the second method into a coordinate system different from that of the second method by using a first position information item as information for the predetermined position detected by the first method and a second position information item as information for the predetermined position detected by the second method in a posture of the work machine when the predetermined position is detected by the first method.