Practical articles on region-of-interest annotation, annotation formats, computer vision zone workflows, and image labelling tools.
Learn how to define regions of interest (ROIs) for computer vision systems — detection zones, exclusion areas, tripwires, and coverage boundaries — and export precise polygon coordinates to your pipeline.
Read articleA clear explanation of the COCO JSON annotation format — its structure, when to use it, and how to generate valid COCO exports using RegionKit without writing a single line of code.
Read articleStep-by-step guide to annotating images for YOLO object detection training using RegionKit — a free, browser-based tool. Draw bounding boxes, export YOLO TXT, and plug coordinates directly into your training pipeline.
Read articleAn honest comparison of the best free image annotation tools available in 2025 — covering CVAT, Label Studio, Roboflow, and RegionKit. Which tool fits your workflow depends on what you're actually trying to do.
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