WebAnnoCV: A Lightweight OpenCV-Based Annotation Tool for Interactive Web Applications

Abstract

Conference Title: 2025 International Conference on Emerging Technologies in Engineering Applications (ICETEA)

Conference Start Date: 2025 June 5

Conference End Date: 2025 June 6

Conference Location: Puducherry, India

Image annotation is a crucial process in building computer vision models for various tasks such as object detection, segmentation and classification. Current annotation solutions are rarely cloud-based or require local software installations, which can lead to issues in latencies, privacy, and dedicated hardware. WebAnnoCV is a very thin annotation tool based on OpenCV that runs in the browser. js (ML-based Object Detection JavaScript Library), HTML (Hypertext Markup Language), JavaScript. This enables speedy image labeling in real time in your web browser with no extra installations or server processing required. The platform supports bounding boxes, polygon segmentation, key points and a slew of other annotation modes. AI-assisted capabilities like edge identification, contour recognition, and object tracking make the application reduce the manual workload significantly and lead a rapid image labeling. The web-based application was designed as a tool where all the processes would be available on the client-side, ensuring the protection of data privacy and eliminating the need for external servers, thereby making it suitable for sensitive domains such as healthcare, finance and education. Annotations are created in standard formats like JSON (JavaScript Object Notation), COCO (Common Objects in Context) and Pascal VOC (Visual Object Classes), so that it erupts directly into popular machine learning frameworks as TensorFlow, PyTorch and OpenCV. WebAnnoCV reduces the time for annotation by up to 30%, with similar accuracy to other forms of annotation. With a user-friendly interface, it is easy to use on PC, tablets, and mobile, making up for its comprehensive functions that are easy for both rookies and professionals to handle. WebAnnoCV offers a secure, scalable and efficient approach for performing annotation tasks in realtime across these diverse application domains, such as autonomous driving, medical imaging and environmental monitoring.