Looking for reliable high quality image annotation services? Aya Data delivers pixel-accurate image labeling for AI teams across the UK, US, Europe, the Middle East, and Africa. We provide bounding boxes, polygons, semantic segmentation, keypoints, and DICOM medical imaging with tiered quality assurance and high-quality datasets in your required format.
What is Image Annotation
Image annotation is the process of labeling objects, regions and attributes within images so machine learning models can learn to recognise them. Each annotation – a box around a vehicle, a polygon traced around a tumour, a mask covering every pixel of a road surface – becomes part of the quality of your model. The quality of that data sets a hard ceiling on model performance. A model cannot learn a distinction its training data never made correctly.
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Image Annotation Services
We deliver high-quality image annotation for bounding boxes, polygons, semantic segmentation, keypoints and DICOM medical imaging to improve the accuracy of computer vision and object detection models.Whether you need 10,000 images or several million, we scale delivery without loosening the review process that produced your pilot results.

Every pixel in the image assigned to a class. Used where the model must understand the whole scene rather than locate discrete objects−road surface versus pavement in autonomous driving, tissue types in medical imaging, land use in satellite imagery.

Clinical annotation performed on native DICOM files without conversion, preserving the metadata that determines annotation accuracy −Hounsfield units, slice thickness, pixel spacing, patient orientation. Reviewed by credentialed clinical specialists with adjudication for ambiguous findings.

3D Cuboid Annotation encapsulates objects in 3D space, providing position, orientation, and dimensions. Our team precisely places these boxes around objects, crucial for tasks like autonomous driving.

Polygon annotation Point-by-point contours traced around irregular objects. Where a bounding box around a crop leaf, a parked car at an angle or a piece of damaged infrastructure would include large amounts of background, polygon annotation captures only the object −producing cleaner training signals for detection and segmentation models.

Instance Segmentation
Instance Segmentation Pixel-level masks that also distinguish individual objects of the same class. Necessary when counting matters −individual fruit on a plant, separate cells in a pathology slide, distinct vehicles in dense traffic.

Keypoint & Landmark Annotation Specific points marked on an object to capture pose, shape or orientation. Used for human pose estimation, facial landmark detection, animal behaviour analysis, and agricultural applications such as identifying stem and fruit attachment points for robotic harvesting.

Image Classification & Tagging
Image Classification & Tagging Whole-image or multi-label classification −categorising images by content, quality, condition or attribute. Used in e-commerce catalogue structuring, content moderation and quality inspection.
How We Measure and Maintain Annotation Quality
Most providers quote a single accuracy figure. That number is almost never defined, and it hides the thing that actually determines whether your model works: whether different annotators labelled the same
Guidelines before annotation
We build the annotation guideline with your ML team before labeling starts, including an explicit edge-case taxonomy. Most quality failures are guideline failures, not annotator failures.
Specialist annotator sourcing
Annotators are recruited and trained by domain and modality −medical imaging, agricultural imagery, automotive scenes −rather than assigned from a general pool.
Tiered review with adjudication
Every batch passes a structured review. Ambiguous cases go to specialist validation. Where annotators disagree, adjudication resolves it rather than averaging it away.
Measured agreement, reported openly
We track Cohen's Kappa for categorical tasks and Dice coefficient for segmentation, reported by annotator and task type −not as a project average.
Industries We Serve
We provide high-quality data annotation services across a range of industries and use cases.
Agriculture
Autonomous Vehicles
Financial Services

Use Cases
Discover how AI-powered image annotation advances healthcare, autonomous driving, and robotics through highly accurate object detection, advanced spatial mapping, and enhanced medical insights for precise diagnostics.

Medical Imaging
Annotate CT, MRI and X-ray studies in native DICOM to train diagnostic and triage models, reviewed by credentialed clinical specialists.
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Autonomous Driving
Trains AI to identify vehicles, pedestrians, lane markings and road signs, enabling safe navigation through complex traffic scenarios.
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Urban Planning
Annotate satellite and street-level imagery to model cityscapes, analyse building density and aid infrastructure planning for urban growth.
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Precision Agriculture
Measure crop health, track plant growth, and identify terrain features for optimized farming operations.
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Environmental Monitoring
Track deforestation, measure coastal erosion and monitor wildlife habitats from satellite and aerial images for conservation efforts.
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Warehouse Automation
Trains robots to recognize packages, navigate warehouse spaces, and perform precise picking and placing tasks.
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Defense and Security
Detects people, vehicles and objects of interest in surveillance and satellite imagery for enhanced situational awareness.
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Selected Case Studies
We help businesses of all sizes effectively navigate their AI journey.
Accelerating Solar Lead Qualification with AI-Powered Geospatial Analysis
Driving Sponsorship ROI Through AI-Powered Brand Detection
Organising Fashion for the AI Era
How AI is Preserving Cemeteries and Heritage Sites
Smart Data Transforms Strawberry Harvesting
Vehicle Damage Detection Speeds Claims
Secure 3D Medical Data Annotation Solutions
Infrastructure Damage Detection Made Precise
Satellite Analysis for Environmental Protection
E-Scooter Detection for Autonomous Vehicles
Advanced Retail Security Through AI
Police Radio Transcription At Scale
Expert Medical Image Data Labeling
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The Aya Advantage
1/ Exceptional Customer ExperienceExceptional Customer Experience
Unwavering Quality
Unparalleled Subject Matter Expertise
Featured News and Insights
Enjoy featured articles and insights from our experts.
Image Annotation: Everything You Need to Know
DICOM Annotation Explained: Challenges, Workflows, and AI Training Considerations
Why Inter-Annotator Agreement Is the Most Underused Quality Signal in Medical AI
Medical Image Segmentation: Why Better Models Cannot Fix Weak Clinical Standards
Frequently Asked Questions
What are image annotation services?
How much do image annotation services cost?
Can I outsource image annotation?
What is the difference between bounding box and polygon annotation?
What is photogrammetry and LiDAR?
What is the difference between semantic and instance segmentation?
Do you handle medical image annotation?
Which image formats do you support?
How do you protect sensitive image data?
Can you annotate millions of images?
Do you offer a free trial or pilot?


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Do you need help with Data Acquisition, Data Annotation or building a custom AI model? Aya Data is ready to partner with you. Talk to us today!















