QYSEA QY-MT — Smart Underwater Measurement Tool
FIFISH Technology · AI Measurement
QY-MT is QYSEA's AI-powered, non-destructive underwater measurement system — combining the forward Q-DVL, laser and proprietary AI vision so a FIFISH ROV can measure cracks, corrosion and structures to up to 99.7% accuracy, in real time or offline from recorded footage. No diver. No contact. No calibration rig.
Precision · Multiple Modes · Online & Offline · Data Visualization
Turn an inspection dive into measurable, documented data
QY-MT is described by QYSEA as the world's first AI-powered non-destructive underwater measurement system. It is purpose-built for underwater infrastructure, hydropower, bridge and ship-hull inspections — letting a single operator quantify defects directly from the ROV's video feed, without a diver entering the water and without any contact with the structure.
- AI adaptive measurement of cracks, voids, peeling and corrosion
- Augmented-reality virtual ruler with centimetre-level real-time precision
- AI Vision Lock stabilises against current for steady "lock and measure"
- Measure live, or re-measure recorded footage offline for reports
- Length, height, angle, curve, area and perimeter — regular or irregular shapes
From "we saw a crack" to "the crack is 14.2 cm long"
Visual-only inspection tells you something is wrong. QY-MT tells you exactly how big, so it can be tracked, reported and acted on.
📷 Visual-Only Limits
A photo of a defect is not a measurement. QY-MT adds quantified length, area and perimeter to the same footage.
⚠️ Diver Risk & Cost
Manual underwater measurement means putting a diver with a tape in current and confined spaces. QY-MT keeps people dry.
🌊 Drift & Current
Hand-measuring from a drifting ROV is unreliable. AI Vision Lock holds the target steady for a repeatable reading.
📑 Reporting Gaps
Offline re-measurement of recorded video turns any dive into a defensible, repeatable inspection record.
Q-DVL + Laser + AI Vision
QY-MT fuses three onboard systems — acoustic positioning, a laser scale reference and 4K+ AI vision — to convert pixels in the live feed into real-world dimensions.
Three systems, one measurement
The forward Q-DVL sonar measures the ROV's velocity and standoff so the platform knows where it sits relative to the target. The laser provides a precise scale reference in the frame, and QYSEA's 4K+ AI vision identifies and traces the target's shape — adapting automatically to different objects and orientations.
- Forward Q-DVL — standoff and stability reference for the measurement
- Laser ruler — known-scale reference embedded in the live view
- 4K+ AI vision — identifies voids, peeling and corrosion and traces outlines
- AI Vision Lock — stabilises against current for accurate lock-and-measure
Also works alongside the U-INS underwater positioning system, 2D imaging sonar and the compass ruler.
AI Adaptive Measurement · AR Ruler · AI Vision Lock
QY-MT brings together three measurement technologies — covering everything from a quick on-screen rule to AI-traced irregular shapes.
AI Adaptive Measurement
Leverages 4K+ AI technology to effortlessly adapt to different shapes and targets in the post-processing system. It identifies voids, peeling and corrosion, and captures the area and perimeter of irregular objects automatically.
- Auto-adapts to different shapes and targets
- Identifies voids, peeling and corrosion
- Area & perimeter of irregular objects
AR Ruler
Identifies underwater targets and adapts to various measurement ranges, offering real-time, centimetre-level precision with customisable virtual rulers laid over the live feed.
- Real-time, centimetre-level precision
- Customisable virtual rulers on the live view
- Adapts to a wide range of target sizes
AI Vision Lock
Stabilises the system against currents, enabling accurate "lock and measure" functions — so the reading stays steady even when the water does not.
- Stabilises against current
- Steady "lock and measure" operation
- Repeatable readings on the same target
Length · Height · Angle
Straight-line dimensions and angles between points on the target.
Curve & Arc
Curve and arc measurement of objects within a plane.
Rectangular · Polygonal · Irregular
Area and perimeter of rectangular, polygonal and irregular shapes.
AI Irregular Capture
The AI-powered system captures the area and perimeter of irregular objects automatically.
Actual QY-MT Measurement Screenshots
These are real QY-MT outputs — the AI traces the target outline and overlays length, area and perimeter directly on the footage. Nothing simulated.
Measurements drawn straight onto the inspection feed
QY-MT outlines the defect and prints its dimensions on the image, so an inspection clip becomes a self-documenting record. A typical bridge-crack reading captures length, height, perimeter and area together.
- Example bridge crack — length 14.20 cm · height 3.74 cm · perimeter 32.38 cm · area 40.26 cm²
- Outlines and dimensions burned onto the footage for the report
- Re-measure the same recording later, offline, with no internet
99.7% in the Lab — Under 2% Error in Practice
QYSEA quotes a laboratory accuracy of up to 99.7%; in practical field applications, maximum error stays below 2% across the working range.
Numbers from QYSEA's own testing
- Control test — Object ① measured 15.04 cm vs 15 cm actual (0.3% error)
- Control test — Object ② measured 46.18 cm vs 46 cm actual (0.4% error)
- Works on objects from 5 cm to 120 cm, at a distance of 30 cm to 200 cm
- Easy to use after just 1–2 hours of practice
Available on These FIFISH Models
QY-MT runs across the FIFISH lineup — QYSEA lists FIFISH W6, E-GO (with laser ruler), E-MASTER, V6 Plus, and more.
Flagship industrial AI ROV — QY-MT ships as one of its four onboard AI modules, paired with the forward Q-DVL.
View E-MASTER →Professional navigation-class ROV with Q-DVL station-holding — a natural platform for steady, locked measurement.
View W6 →Compact, portable inspection ROV. Supports QY-MT with the laser ruler accessory fitted.
View E-GO →Versatile professional ROV with an AR-ruler workflow — listed by QYSEA among the QY-MT compatible models.
View V6 Plus →QY-MT post-processing currently runs on PC only — Windows 10 or later, 64-bit. It is not supported on mobile devices. Offline measurement mode is available for environments without internet access.
Measurement-Driven Inspection
QY-MT was built for the inspections where a number — not just an image — is what the report needs.
Bridge & Structural Inspection
Quantify crack length, width, area and perimeter on piers and submerged structures — example reading: a 14.20 cm crack, 40.26 cm² area.
Underwater Infrastructure
Measure voids, peeling and corrosion on quays, intakes and submerged civil works for maintenance planning.
Hydropower & Dams
Document defects on dam faces, gates and intakes without dewatering or sending in a diver.
Ship Hull Inspection
Size hull damage, corrosion patches and coating defects directly from the ROV feed for class and repair scoping.
Pipeline & Tank Inspection
Confined-space measurement inside water tanks and pipelines, with AI Vision Lock holding the reading steady.
Inspection Reporting
Offline re-measurement of recorded footage turns any dive into a repeatable, defensible inspection record.
QY-MT Specifications
Measurement Performance ▾
| Accuracy (laboratory) | Up to 99.7% |
| Max Error (practical) | Less than 2% (30–200 cm range) |
| Object Size Range | 5 cm to 120 cm |
| Measuring Distance | 30 cm to 200 cm |
| Real-Time Precision | Centimetre-level (AR ruler) |
Capabilities & Modes ▾
| Measurement Types | Length · height · angle · curve · arc · area · perimeter |
| Shapes | Rectangular · polygonal · irregular |
| AI Adaptive Measurement | 4K+ AI — voids, peeling, corrosion (post-processing) |
| AR Ruler | Real-time, customisable virtual rulers |
| AI Vision Lock | Current stabilisation · lock and measure |
| Operating Modes | Online (real-time) & offline (post-processing) |
Compatibility & Platform ▾
| Compatible ROVs | FIFISH W6 · E-GO (with laser ruler) · E-MASTER · V6 Plus · and more |
| Works With | Q-DVL · laser · U-INS positioning · 2D imaging sonar · compass ruler |
| Platform | PC only — Windows 10+ (64-bit) |
| Mobile Devices | Not supported |
| Offline Mode | Supported (no internet required) |
| Learning Curve | Usable after 1–2 hours of practice |
Request QY-MT Pricing
Tell us which FIFISH ROV you run and what you need to measure, and we will prepare a complete EUR quote — including any laser ruler or sensor accessory needed to enable QY-MT.
Request a Quote — QY-MT Measurement Tool
Describe your inspection requirements and we will confirm QY-MT compatibility with your ROV and recommend the right configuration.