Inside Markerless Wound Imaging: How Phone-Camera Measurement Actually Works
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A deep dive into markerless wound measurement — no rulers, no ArUco stickers, just a phone camera and a calibrated depth model.
Every wound care platform claims 'accurate measurement.' Most still require a sticker, ruler, or reference marker in the frame. Here's how markerless imaging works and why it matters at the bedside.
The problem with marker-based imaging
Stickers fall off. Rulers contaminate. Reference cards get lost in a mobile bag. Every marker in the frame is another step between the clinician and the next patient — and another failure mode when the marker is missed or placed incorrectly.
What markerless actually means
AI-powered wound imaging uses the phone's camera intrinsics and depth signals to compute a metric scale without any physical reference in the frame. The clinician points, captures, and moves on.
The measurement pipeline
- Capture — a single phone photo, no marker, no special hardware.
- Segmentation — the wound bed, periwound, and tissue types are outlined.
- Scaling — depth and camera geometry compute real-world millimeters per pixel.
- Planimetry — length, width, area, and tissue composition are calculated.
- Attachment — the measured image is attached to the chart as an auditable source.
Why it matters for reimbursement and trials
Calibrated, reproducible measurements support medical necessity, healing trajectory claims, and skin substitute coverage. Serial images feed the Healing dashboard so stalled wounds surface before week four.
Where it fits in the visit
Imaging runs in parallel with the ambient scribe. By the time you finish the assessment, measurements are already populated in the note. Review, sign, done.