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Hand Measurement

Product requirement

The functionality described requires a Metaglove Pro series glove.

Introduction

Users requiring the flexibility and control to fine-tune their hand measurement calibration can do so in MANUS Core Dashboard. This article provides instructions on how to take accurate hand measurements and adjust the calibration profile in MANUS Core.

Overview

Accurate hand measurement is a crucial aspect of ensuring accurate finger tracking. The MANUS Core calibration process is fine-tuned for a wide range of hand sizes and shapes. However in some specific instances it can be challenging to achieve the desired level of precision. Properly measuring the hand dimensions allows for our highest level of precision and user experience when using our devices.

Measurements

The following measurements are tracked within the calibration profile.

  • Hand Length The distance from the center of the wrist to the tip of the longest finger. This value cannot be edited and is automatically calculated based on the finger length values.
  • Hand Width The distance across the widest part of the hand, typically just below the knuckles.
  • Wrist Width The distance across the wrist at its widest point.

Thumb

  • Metacarpal Length The length of the thumb metacarpal bone.
  • Proximal Length The length of the thumb proximal phalanx.
  • Distal Length The length of the thumb distal phalanx.
  • Distal Thickness The thickness of the thumb distal phalanx.
  • Tip to casing The distance from the tip of the thumb to the edge of the sensor casing.

Index/Middle/Ring/Pinky

  • Wrist to MCP Length The distance from the center of the wrist to the center of the metacarpophalangeal (MCP) joint. This value is used to calculate the metacarpal length.
  • Metacarpal Length The length of the metacarpal bone. This value cannot be edited and is automatically calculated based on the wrist to MCP length.
  • Proximal Length The length of the proximal phalanx.
  • Distal Length The length of the distal phalanx.
  • Distal Thickness The thickness of the distal phalanx.
  • Tip to casing The distance from the tip of the finger to the edge of the sensor casing.

Taking Accurate Hand Measurements

Accurate measurements are the foundation of a reliable calibration profile. To achieve consistent results, it is important to measure carefully and use a consistent method for both hands. We recommend using a flexible tape measure or caliper for maximum accuracy.

General Guidelines

  • Take measurements along the dorsal (back) side of the hand unless specified otherwise.
  • Keep the hand relaxed and flat on a surface while measuring.
  • Record values in millimeters (mm).
  • Measure both hands separately to account for any differences in size or shape.
  • Verify the individual finger segment measurements against a reference measurement of the entire finger to account for any measurement discrepancies.

Step-by-Step Process

  1. Hand Width
  • Measure across the widest part of the palm, just below the knuckles (MCP joints).
  1. Wrist Width
  • Measure across the wrist at its widest point, typically over the wrist bones.
  1. Thumb Measurements

  • Measure the length of each thumb segment:

    • Metacarpal (base of thumb to MCP joint).
    • Proximal (MCP to IP joint).
    • Distal (IP joint to fingertip).
    • Measure distal thickness at the IP joint.
    • Measure tip to casing from the fingertip to the glove’s sensor casing contact point.
  1. Index, Middle, Ring, and Pinky Fingers
  • Start with Wrist to MCP Length: from the center of the wrist crease to the corresponding MCP joint.
  • Measure each finger segment:
    • Proximal phalanx (MCP to PIP joint).
    • Intermediate phalanx (PIP to DIP joint).
    • Distal phalanx (DIP joint to fingertip).
  • Measure distal thickness at the DIP joint.
  • Measure tip to casing from fingertip to sensor casing.

Tips for Consistency

  • Repeat each measurement at least twice and use the average.
  • For best results, have another person assist with taking measurements.
  • Double-check alignment with anatomical landmarks (joints and creases).

Adjusting the Calibration Profile

To adjust the calibration profile, users can navigate to the User profile settings in the MANUS Core Dashboard. From there, they will need to have calibrated at least once before making any adjustments. The measurements section will become visible and the values can be input. To then save the changes, Apply changes must be clicked to confirm the adjustments. To revert to the last applied state, users can click on Revert. To go back to an older calibration state, users can opt to Save and then Load an earlier profile.

Fine tuning the Calibration Profile

Its possible that after calibration the solve doesn't perform as expected. In this case its possible to fine tune the calibration profile by adjusting the hand measurements.

In cases where the fingers appear to not be straigtened when fully extended, its advised to slightly decrease the proximal, intermediate and distal lengths of the affected fingers. And in cases where during flexing of the fingers the fingers remain too straight, it may be necessary to increase the lengths of these phalanges.