Foot Scan Reference Gap Tool

Description

Compare already registered research scan points; no registration algorithm or clinical fit assessment.

Foot and footwear research uses geometric dimensions, contact cells, forces, and measurement records. A length margin, normalized difference, or contact share has a specific measurement basis and can omit important three-dimensional or sensor effects. Arithmetic on supplied observations is separate from a validated clinical assessment.

Compare already registered research scan points; no registration algorithm or clinical fit assessment.

When to use this tool

Use Foot Scan Reference Gap when you have supplied foot, footwear, bench, or recording data and need this measurement or record-support calculation.

How to use the tool and how it works

Enter pointCoordinates, referenceCoordinates. Keep parallel arrays aligned. Use the units and conventions below.
Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
Read distances, meanDistance, maximumDistance, defined. Inspect defined before interpreting the associated values.

Require equally sized pointCoordinates and referenceCoordinates lists with three coordinates per point. Return Euclidean distances for paired points, their meanDistance and maximumDistance, and defined=true if nonempty; empty pairs return zero summaries and defined=false.^[1]

Input field	Meaning and units	Accepted input
pointCoordinates	Point Coordinates	Required. Array of array of finite number; maximum items 128; maximum items 128.
referenceCoordinates	Reference Coordinates	Required. Array of array of finite number; maximum items 128; maximum items 128.

Output field	Interpretation	Returned shape
distances	Distances	Required. Array of finite number; maximum items 256.
meanDistance	Mean Distance	Required. Finite number.
maximumDistance	Maximum Distance	Required. Finite number.
defined	Whether at least one paired point exists; zero summaries otherwise are placeholders.	Required. Boolean.

json

{
  "input": {
    "pointCoordinates": [
      [
        0,
        0,
        0
      ],
      [
        1,
        2,
        3
      ]
    ],
    "referenceCoordinates": [
      [
        0,
        0,
        0
      ],
      [
        1,
        2,
        5
      ]
    ]
  },
  "output": {
    "distances": [
      0,
      2
    ],
    "meanDistance": 1,
    "maximumDistance": 2,
    "defined": true
  }
}

Limitations and assumptions

Coordinates need one length unit and prealigned frames with known correspondences. This is not registration, surface fitting, or a diagnostic scan comparison; empty summary values are placeholders.
Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.

Alternative or Complementary methods

Use a documented measurement protocol with calibrated equipment and appropriate geometric or contact models. Broader interpretation requires assessment of the underlying observations beyond one length, ratio, or support flag.

References

Calculation and input contract: podiatry/foot-scan-reference-gap — tool.io

Similar or alternative tools

Foot Scan Pixel Axis Sign
Convert supplied pixel displacements using explicit axis scales and signs.
Podiatry Research Left Right Length Gap
Compare supplied research foot lengths with independent bounded measurement errors.