What is data annotation in AI?

Data annotation is the process of labeling raw data — images, text, audio, video, or 3D point clouds — so that machine learning models can learn from it. Annotated datasets are the foundation of supervised AI training. Without high-quality annotated data, AI models cannot achieve reliable accuracy.

What types of data annotation services does Data Terminal offer?

Data Terminal offers image annotation (bounding boxes, semantic segmentation, polygon, keypoints), video annotation (object tracking, activity recognition), text annotation (NER, sentiment, intent classification), audio annotation (transcription, speaker diarization, emotion tagging), LiDAR/3D point cloud annotation, document annotation (OCR correction, invoice parsing, form extraction), and RLHF (reinforcement learning from human feedback) for large language models.

What is the difference between data labeling and data annotation?

Data labeling assigns a single tag or category to a data item (e.g., 'cat' or 'dog'). Data annotation is broader — it includes labeling but also adds contextual metadata such as bounding boxes, segmentation masks, timestamps, relationships, and attributes. All labeling is annotation, but not all annotation is mere labeling.

How do you ensure quality in data annotation?

Data Terminal uses a multi-pass quality assurance process: custom annotation guidelines per project, pilot batch review, inter-annotator agreement (IAA) scoring, two-tier human review, automated consistency checks, and client feedback loops. We maintain 99.5% accuracy across projects.

What annotation output formats do you support?

We support all major annotation formats including COCO JSON, Pascal VOC XML, YOLO TXT, CVAT XML, Labelbox JSON, custom JSON/JSONL, and CSV. We can also deliver in any client-specified format.

How long does a data annotation project take?

Standard projects are delivered within 48–72 hours for small batches (up to 5,000 items). Large-scale projects (100,000+ items) are scoped with a dedicated timeline. Rush delivery is available for urgent AI training requirements.

Can Data Terminal handle large-scale data annotation projects?

Yes. Data Terminal has handled projects exceeding 50 million annotations. We scale annotation teams on demand for high-volume requirements, with dedicated project managers and continuous quality monitoring.

Why choose India for data annotation services?

India offers a large pool of English-proficient, technically trained annotators at cost-effective rates — typically 60–70% lower than US or European providers — without compromising on accuracy. Indian annotation teams are experienced in medical, legal, automotive, and NLP domains.

What industries does Data Terminal serve with data annotation?

Data Terminal serves autonomous vehicles, healthcare AI (medical imaging), e-commerce, agriculture, robotics, content moderation, satellite/geospatial imaging, legal/finance NLP, retail, and conversational AI (chatbots, virtual assistants).

What annotation tools does Data Terminal use?

We work with CVAT, Labelbox, Scale AI-compatible pipelines, Roboflow, VGG Image Annotator (VIA), and custom in-house annotation tools. We can integrate with your existing annotation platform or provide a fully managed environment.

What is image annotation?

Image annotation is the process of labeling objects, regions, and attributes in digital images so machine learning models can learn to detect, classify, and understand visual content. Common techniques include bounding boxes, semantic segmentation, polygon annotation, and keypoint labeling. Data Terminal delivers 99.5% pixel-accuracy image annotation for computer vision AI.

What types of image annotation does Data Terminal offer?

Data Terminal offers tight and loose 2D bounding boxes, semantic segmentation, instance segmentation, polygon annotation, keypoint/landmark annotation, image classification, and panoptic segmentation. All annotation types are available with 99.5% accuracy and 24-hour turnaround.

How much does image annotation cost in India?

Image annotation costs in India range from ₹2–₹15 per image depending on complexity. Simple bounding boxes start at ₹2–₹3/image. Semantic segmentation is ₹8–₹15/image. Polygon annotation is ₹5–₹10/image. Data Terminal offers volume discounts of 10–30% for projects over 1,000 images.

What is the difference between semantic and instance segmentation?

Semantic segmentation labels every pixel with a class (all cars are one color). Instance segmentation identifies each individual object separately (car 1, car 2, car 3). Instance segmentation is used for counting and tracking; semantic is used for scene understanding. Data Terminal handles both at scale.

How long does image annotation take?

Standard image annotation turnaround at Data Terminal is 24–48 hours for batches up to 10,000 images. Rush same-day delivery is available. For 100,000+ image projects, parallel annotation teams deliver 50,000+ images per day.

What output formats do you support for image annotation?

We deliver in COCO JSON, Pascal VOC XML, YOLO TXT, CVAT XML, TFRecord, CSV, and any custom format. Format conversion is included at no extra cost.

What annotation tools do you use for image annotation?

Data Terminal uses CVAT, Labelbox, Roboflow, VGG Image Annotator (VIA), SuperAnnotate, and custom in-house pipelines. We can annotate in your existing platform or provide a fully managed environment.

Why outsource image annotation to India?

India offers English-proficient, domain-trained image annotators at 60–70% lower cost than US or European providers. Data Terminal's India-based team annotates 50,000+ images per day with 99.5% accuracy across medical, automotive, agriculture, retail, and satellite imaging verticals.

Image Annotation · India · 2026

Image Annotation Services in India

99.5% Accuracy · ₹2–₹15 per image · 24-hour turnaround · 50,000+ images/day

India's most accurate image annotation service. Expert-annotated bounding boxes, segmentation masks, keypoints and classification labels delivered in COCO JSON, YOLO, Pascal VOC, or any custom format.

Get Free 50-Image Sample Get a Quote

📞 +91-9014387222 · contact@dataterminal.co

annotation-tool · image.dataterminal.co

CAR 0.97

PERSON 0.94

TRUCK 0.99

BICYCLE 0.91

99.5%IoU Accuracy

24hTurnaround

₹2–₹15Per Image

50K+Images Per Day

5+Years Experience

What We Annotate

Every Image Annotation Type. One Team.

Bounding box, segmentation, polygon, keypoint — expert-annotated with 99.5% accuracy, delivered in your format.

Bounding Box

From ₹2/image

Tight and loose rectangular boxes for object detection. Most common annotation type for YOLO, Faster R-CNN, SSD models.

Object Detection

Semantic Segmentation

From ₹8/image

Pixel-level class labeling for scene understanding. Every pixel assigned to a class — ideal for self-driving and satellite imagery.

Scene Understanding

Instance Segmentation

From ₹10/image

Each individual object instance labeled separately. Enables counting, tracking, and part-level analysis at pixel accuracy.

Object Tracking

Polygon Annotation

From ₹5/image

Precise polygonal outlines for irregular shapes. More accurate than bounding boxes for non-rectangular objects.

Precision Shapes

Keypoint / Landmark

From ₹4/image

Dot-based skeletal annotation for pose estimation, facial landmarks, and body joint detection models.

Pose Estimation

Image Classification

From ₹1/image

Whole-image class labels for recognition models. Fastest annotation type — 99.5% inter-annotator agreement.

Image Recognition

Quality Methodology

How We Hit 99.5% Accuracy

99.5%

Average Accuracy Score

Industry Average85%

Data Terminal99.5%

Step 01

Primary Annotation

Expert annotators assigned by vertical — AV, medical, retail, satellite. Domain knowledge applied from image 1.

Step 02

Peer Review

Second annotator reviews every label. Any box or mask with accuracy below threshold is flagged immediately for re-annotation.

Step 03

Gold Standard Validation

5% random sample tested against pre-labeled gold images. Batch fails if any label drifts from baseline.

Step 04

Automated Accuracy Check

Script validates every completed batch. No annotation ships below the minimum threshold — ever.

99.5%

IoU / Pixel Accuracy

99.1%

Inter-Annotator Agreement

Zero

Missed Objects Post-QC

Our Process

Upload to Delivery — 24 Hours

Upload

Share images via secure portal, Google Drive, S3, or FTP. JPG, PNG, TIFF, DICOM, BMP — any format accepted. NDA signed on request.

Annotate

Expert annotators work in CVAT, Labelbox, or your preferred tool. Domain specialists assigned per vertical.

QC Review

Every image through 3-layer quality control. Any label below threshold re-annotated before delivery.

Deliver

Receive in COCO JSON, YOLO, Pascal VOC, or any custom format. Full accuracy report included.

Industries Served

Built for Every Vertical

Dedicated annotation teams per industry — not generalists.

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Autonomous Vehicles

Pedestrian, vehicle, sign and lane detection. Pixel-perfect segmentation + tracking IDs. 50K+ frames/day.

Segmentation + Tracking

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Medical Imaging

Tumour localisation, cell detection, surgical instrument tracking. Precision-critical annotation by trained specialists.

Precision Annotation

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Agriculture

Crop disease detection, pest identification, yield estimation from aerial imagery. Polygon + OBB specialist.

Aerial Imagery

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Retail & E-commerce

Product detection, shelf monitoring, cashierless checkout. Multi-class annotation at scale.

Multi-class

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Satellite Imagery

Land use classification, building detection, road extraction from high-resolution satellite data.

Geospatial

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Security & Surveillance

Person, vehicle, and object detection. Instance segmentation for crowd analytics and intrusion detection.

Real-time Detection

Formats & Tools

Works With Your Pipeline

Export Formats

COCO JSONYOLO TXTPascal VOC XMLTFRecordCSVCustom

Annotation Tools

CVATLabelboxRoboflowSuperAnnotateV7 DarwinCustom API

If your pipeline requires a specific schema or tool integration, we build the connector at no extra cost.

Free Sample Offer

Try Before You Commit

Send us 50 images. We'll annotate them free in 24 hours — your annotation type, your format, with an accuracy report. No payment. No commitment.

50 images annotatedAny annotation typeYour output formatAccuracy report included24h delivery

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FAQ

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Free sample on your first project. Response in under 2 hours. Transparent pricing with no hidden costs.

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Phone+91-9014387222

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Emailcontact@dataterminal.co

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LocationHITEC City, Hyderabad, India

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