Description
Convert a supplied plaque-image distance by a physical reference scale.
Dental records depend on surface notation, assessed and excluded denominators, missing versus observed zero, reporting quanta and recorded equipment dates. Calendar-day counts can be elapsed or inclusive, and nominal expiry comparisons do not establish sterility. Local surface fractions and source labels are not automatically validated clinical indices.
Convert a supplied plaque-image distance by a physical reference scale.
When to use this tool
Use Plaque Disclosure Image Scale Ratio when you already have imageDistancePixels, referencePixels, referenceLength and need to convert a supplied plaque-image distance by a physical reference scale.
How to use the tool and how it works
- Enter imageDistancePixels, referencePixels, referenceLength. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read physicalDistance. Use the output convention below.
Require imageDistancePixels>=0, referencePixels positive/finite and referenceLength>=0; return pixels/referencePixels*referenceLength.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| imageDistancePixels | Image Distance Pixels | Required. Finite number; minimum 0. |
| referencePixels | Reference Pixels | Required. Finite number; strictly above 0. |
| referenceLength | Reference Length | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| physicalDistance | Physical Distance | Required. Finite number. |
{
"input": {
"imageDistancePixels": 120,
"referencePixels": 60,
"referenceLength": 5
},
"output": {
"physicalDistance": 10
}
}Limitations and assumptions
- A zero physical reference gives zero. Linear calibration is assumed; no image analysis, lens correction, plaque amount or clinical finding is established.
- 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.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use original chart, observation and reprocessing records with the complete scoring or controlled workflow. Keep denominator, missingness and date conventions explicit; local arithmetic does not determine oral-health status, appropriate recall intervals or readiness for care.
References
Similar or alternative tools
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Scale supplied skin-image pixels using a physical scale bar.
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Scale a supplied body-image length by a reference length.