Murph
Optional homeDraftUsableSkinPhotoagingMeasurement Method

Measurement method page

Home Standardized Photo ROI Analysis

An optional home image-analysis method for fixed facial or periocular photo regions of interest, combining wrinkle-line, calibrated-color, and texture-index outputs from the same locked photo workflow.

Short name

Home Photo ROI Analysis

Modality

Standardized Photo, Calibrated Photo, and Image Analysis

Commons revision

5459ea256a

Procedure
Use the same standardized photo set as the default workflow, then analyze locked regions of interest with one pre-written image-analysis recipe for the whole run.

Materials

  • same camera or phone
  • fixed lighting and distance reference
  • saved ROI crop or template
  • ImageJ/Fiji or similar free image-analysis tool
  • optional gray card or inexpensive color card

Steps

  1. Choose each ROI before starting, such as right crow's-feet, left crow's-feet, glabellar lines, or one cheek texture area.
  2. Use the same camera, distance, lighting, expression, crop, file export, and makeup or sunscreen rule at baseline, week 4, and week 6.
  3. For wrinkle analysis, apply the same crop, grayscale or contrast step, threshold or edge rule, and line-length, line-area, or percent-ROI calculation every time.
  4. For calibrated color analysis, place a gray card or color card in the same plane as the face, lock exposure and white balance when possible, and keep the formula fixed.
  5. For texture analysis, use one formula such as local contrast standard deviation, edge density, or thresholded roughness-like area percentage.
  6. Report within-person normalized or baseline-indexed values, not cross-person comparisons.
  7. Keep original face photos private and local by default; use ROI crops or derived measurements for analysis or sharing unless identifiable photos are intentionally shared.

Schedule

  • Use at baseline, week 4, and week 6 only when the add-on path is selected before the run.
Outputs
What this method produces and how to interpret it.
Wrinkle line length or areaNumbernormalized line length, area, or percent ROI

Maps to Periocular Wrinkle Score.

Companion proxy for the pre-specified periocular or wrinkle region; do not compare raw pixels across cameras, crops, or threshold settings.

Calibrated color / pigment deltaNumbercalibrated color delta or baseline-indexed proxy

Safety/context proxy for pigment, redness, or brightness drift; intentionally has no mapsToBiomarkerKey until a pigment or erythema outcome exists. Use this output to flag possible pigment worsening, irritation, sun-exposure confounding, or lighting/calibration drift before interpreting efficacy.

Texture indexIndexnormalized texture index

Maps to Skin Texture / Roughness Score.

Companion proxy for texture or roughness; focus, lighting angle, hydration, camera sharpening, and threshold settings can dominate small changes.

Fidelity
  • ROI templates, lighting, camera, crop, file export, calibration, and analysis formulas must be locked before the baseline-to-follow-up comparison.
  • The color output needs a visible gray card or color card if it is interpreted as calibrated rather than descriptive context.
  • Use a gray card or color card for color outputs; do not switch card placement, white-balance handling, or color formula mid-run.
  • Save the ImageJ/Fiji workflow and ROI template so the analysis can be rerun or blinded later.
  • Repeatability risk: expression or squinting.
  • Repeatability risk: camera distance.
  • Repeatability risk: lighting angle or spectrum.
  • Repeatability risk: focus drift.
  • Repeatability risk: auto white balance.
  • Repeatability risk: crop or ROI drift.
  • Repeatability risk: threshold settings.
  • Repeatability risk: image compression.
  • Repeatability risk: makeup or sunscreen.
  • Repeatability risk: skin hydration.
  • Repeatability risk: recent procedures.
Privacy
  • Local-only storage is recommended.
  • This method can include identifiable images.
  • Original face photos are identifiable health-adjacent media. Keep them private and strip metadata where practical.
  • Prefer ROI crops or derived values for review and sharing.
Burden
  • User burden: Moderate.
  • Cost tier: Low Cost.
Confounders
  • expression or squinting
  • camera distance
  • lighting angle
  • auto white balance
  • focus drift
  • crop or ROI drift
  • threshold settings
  • image compression
  • makeup or sunscreen
  • skin hydration
  • sun exposure
  • retinoids or acids
  • recent procedures
Related outcomes
  • Periocular Wrinkle Score
  • Skin Texture / Roughness Score
Interpretation
  • Compare the same ROI within the same person using one locked workflow, then interpret only alongside the default photo scores, adherence, confounders, and tolerability symptoms.
  • This method is more quantifiable than a visual score but remains a personal photo proxy, not a validated clinical endpoint.