Image Measurement Apparatus Movement Correction

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Solution Overview

Problem

Existing image measurement apparatuses face challenges in maintaining high measurement accuracy due to vibrations and positional deviations during the movement of the image capturing unit, which affect the precision of shape measurement.

Innovation Solution

An image measurement apparatus that calculates a correction value from static and moving image capture groups, allowing for accurate measurement by compensating for distortions caused by movement, using a combination of image capturing, movement mechanisms, and calculation parts to adjust image capturing positions and correct measurement results.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the image capturing unit is moved to measure multiple objects or different regions, then productivity and measurement efficiency are improved, but measurement precision deteriorates due to vibrations and positional deviations during movement

Engineering Contradiction:

Improvemeasurement efficiencyVSAvoidmeasurement accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The system performs preliminary calibration by capturing images at multiple positions with the image capturing unit held stationary, then calculates correction values for each position based on these static measurements. These correction values are stored and applied during subsequent dynamic measurements, allowing the system to compensate for positional deviations and vibrations that occur during movement.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system establishes a feedback mechanism where correction values derived from static position calibration are continuously applied during dynamic operation. The measurement results are corrected in real-time using pre-calculated compensation data, creating a closed-loop system that maintains measurement accuracy despite movement-induced disturbances.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If the image capturing unit is held static at each position to ensure measurement accuracy, then measurement precision is improved, but measurement time increases due to the need to stop and capture images at each position

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidmeasurement time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The system performs a one-time preliminary calibration phase where the image capturing unit is held static at each measurement position to capture reference images and calculate correction values. After this initial setup, the system transitions to dynamic measurement mode where images are captured during movement without stopping, significantly reducing measurement time while maintaining accuracy through the application of pre-calculated correction values.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system applies correction values to all measurement positions, including those where the image capturing unit was held static during calibration. This partial application of correction (focusing on dynamic measurement positions) allows the system to maintain high precision without requiring static holding at every single measurement point during normal operation.

Inventive Principle:

Principle #16Partial or excessive action

3Measurement precision

If correction values are calculated and applied to compensate for movement effects, then measurement precision during movement is improved, but device complexity increases due to the need for additional calculation and correction mechanisms

Engineering Contradiction:

Improvemeasurement accuracy during movementVSAvoidsystem complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system introduces correction values as an intermediary element that mediates between the raw dynamic measurements and the final accurate results. These correction values, calculated from static calibration data, serve as a bridge that compensates for movement effects without requiring complex hardware modifications or real-time vibration sensing systems.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system creates a virtual model of positional deviations by capturing reference images at static positions and calculating correction values that represent the ideal positional relationships. This virtual correction model is then applied to dynamic measurements, allowing the system to compensate for physical movement effects through computational rather than mechanical means.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS10001368B2Image measurement apparatus, image measurement method, information processing apparatus, information processing method, and program

Publication Date: 2018.06.19 MITUTOYO CORP

AI summary

Provided is an object image measurement apparatus including an image capturing part that image-captures an object; a movement mechanism that changes an image capturing position of the image capturing part to the object; and a calculation part that calculates a correction value from a first captured image group acquired by placing the image capturing part static at each of a plurality of image capturing positions and a second captured image group acquired by relatively moving the image capturing part so as to pass each of a plurality of the image capturing positions. The first captured image group and the second captured image group are captured image groups of images captured at a plurality of the predetermined image capturing positions by the image capturing part.