01 / WHY POLYGONS WIN
Boxes guess. Polygon annotation services know.
A bounding box around a person, vehicle or roof is mostly background. That background becomes label noise, and label noise becomes false positives. Our polygon annotation services cut that noise from about 38 percent to under 3 percent by following curves and concave corners instead of drawing rectangles.
Cheap and fast. Right for counting cartons, pallets and large rectangular objects. Wrong for anything with limbs, angles or curves.
Vertex tight labels for irregular objects. Expect 8 to 22 points higher precision on tight classes, plus masks you can render straight from the vertices.
02 / TRY BEFORE YOU BUY
Drag the vertices. That is the job.
Every dot below is a paid decision in polygon annotation services: too few and the edge cuts corners, too many and you pay for noise. Drag points around, add one on the longest edge, hit Simplify, and watch the COCO output update exactly as our polygon annotation services deliver it.
03 / COVERAGE
Polygon annotation services for every edge case
Convex polygons
Tight outlines for products, parcels, panels and parts under 12 vertices. The fastest tier of polygon annotation services, from Rs.5 per object.
Concave polygons
People, animals, vehicles, furniture and tools with inward corners and curves. Direction change rule locked per project for consistent density.
Holes and rings
Donuts, courtyards, windows and mechanical rings as outer plus inner rings. Raster checked so masks match vertices pixel for pixel.
Occlusion splits
Poles, shadows and overlaps split into visible parts with shared IDs and occluded flags. One written rule across the whole dataset.
Crowd polygons
Dense markets, shelves and parking lots with non overlapping instance polygons, crowd flags where your schema needs them, and strict ID hygiene.
Video sequence polygons
Polygons tracked across frames with persistent IDs for MOT and VIS. Keyframes plus human corrected interpolation at every turn.
04 / VERTEX PROTOCOL
Rules before vertices
Great polygon annotation services are 20 percent drawing and 80 percent rules. We freeze this protocol on your 50 image pilot, then enforce it with automated checks on every batch.
- Vertex at every direction change above 8 degrees
- Straight runs simplified with locked tolerance, never eyeballed
- Clockwise order from topmost point, holes wound opposite
- Zero self intersections, zero duplicate consecutive points
- Occlusion, crowd and truncation tags from a closed vocabulary
QUALITY GATES
Vertex level QA, not spot checks
Self intersection, winding, min edge, spike and duplicate detection on 100% of polygons.
Independent redraw audit on 20% with boundary distance scoring.
Gold sample review with 99% precision bar before any batch ships.
Overlay renders plus QA sheet with edit rate per annotator in every drop.
05 / WHERE POLYGONS PAY
Built for your domain, not generic crowds
Cars, pedestrians, cones and lane adjacent objects with occlusion splits.
Lesions, organs and cells with medically trained annotators and DICOM export.
SKUs, facings and price tags with crowd safe instance separation.
Rows, weeds, trees and plots on orthomosaics with GeoJSON tiles.
Roofs, roads, water and parcels with hole correct footprints.
Scratches, dents and missing parts with defect grade tags.
Person polygons with occlusion flags for tracking ready sets.
Curved text regions and tables as polygons, not boxes.
Convex shapes under 12 vertices. Products, parcels, panels. 24h for 5K objects.
Start free 50 pilotConcave polygons with 12 to 30 vertices. People, vehicles, animals, roofs. Most popular tier.
Start free 50 pilotHoles, occlusion splits, 30 plus vertices, crowd scenes, medical cells. Domain pods only.
Start free 50 pilotDelivery your training code can import
Polygon annotation services from DataTerminal land as COCO segmentation, YOLO-seg txt, Pascal VOC polygons, CVAT XML, LabelMe JSON and GeoJSON, with PNG masks rendered from the same vertices on request. Clockwise order from the topmost point is default. Clock positions, normalized or absolute, and custom CSV columns match your loader.
RELATED ANNOTATION SERVICES
Pair polygons with the full stack
Boxes, masks, keypoints and classification alongside polygons.
Video Annotation ServicesTracking, temporal segmentation and sequence polygons.
Bounding Box AnnotationTight boxes for rectangular classes at box pricing.
LiDAR and 3D AnnotationCuboids and 3D segmentation fused with 2D polygons.
Best Polygon Vendors 2026Ranked comparison of polygon annotation services in India.
All Data Annotation ServicesThe full hub: image, video, LiDAR, text, audio, RLHF.
What polygon annotation services actually do
Polygon annotation services convert raw images into shape true training data by placing vertices along every meaningful edge. A pedestrian gets points at shoulders, elbows, hips and shoes instead of one rectangle full of road. A rooftop gets corners, notches and inner courtyards instead of a box full of trees. Those vertices train detectors, segmenters and inspection models to fire on objects and ignore background, which is why teams switch tight classes from boxes to polygons before any architecture tuning.
DataTerminal runs polygon annotation services from Hyderabad for clients worldwide, with dedicated pods for auto, medical, retail, geospatial and industrial inspection. If you are comparing vendors, read our ranked breakdown of best polygon annotation services in India 2026, then send the same 50 images to us and one other vendor. The overlays decide in one look.
When boxes are enough
Honest guidance wins better models: if your objects are rectangular, large and well separated, stay on bounding box annotation and spend the savings on more images. Move to polygon annotation services when errors cluster on edges, when masks matter, when occlusion is constant, or when your buyer asks for COCO segmentation and YOLO-seg instead of boxes. Mixed datasets are normal: boxes for easy classes, polygons for money classes, all from one vendor and one QA sheet.
06 / ANSWERS
Polygon annotation services, answered
Send 50 images. Get perfect polygons back.
The fastest way to judge polygon annotation services is overlays, not decks. We return your pilot in COCO plus YOLO-seg within 24 hours with the frozen vertex protocol attached.
