🔭 Cylinder Volume Estimator

YOLO-seg detects objects → Depth Anything V2 measures metric depth →
Pinhole geometry computes real-world Height, Diameter & Volume.

V = π × (D/2)² × H H = (H_px / fy) × Z D = (W_px / fy) × Z

Tip: For best accuracy set Focal length fy from your camera spec,
or use the VFOV slider for auto-estimation.

Input image

Focal length fy (px) — 0 = auto from VFOV

Camera focal length in pixels. 0 = auto-estimated.

Vertical FOV (°) — used when fy = 0

30 120

YOLO confidence threshold

0.2 0.9

YOLO NMS IoU threshold

0.2 0.8

YOLO inference size (px) — lower = faster

Aspect threshold (H/W upright vs on-side)

0.8 3

Mask overlay alpha

0.1 0.7

Annotated output

Measurements

Formula reference

Symbol	Meaning
`fy`	Vertical focal length in pixels
`Z`	Metric depth from Depth-Anything-V2 (metres)
`H_px`	Pixel height of the detected cylinder
`D_px`	Pixel diameter (minor axis of fitted ellipse)
`H`	Real height = `(H_px / fy) × Z`
`D`	Real diameter = `(D_px / fy) × Z`
`V`	Volume = `π × (D/2)² × H`

Upright : bbox H/W ≥ aspect threshold → long axis = cylinder height
On-side : bbox H/W < aspect threshold → long axis = cylinder length