Book Image

Hands-On Computer Vision with Detectron2

By : Van Vung Pham
5 (4)
Book Image

Hands-On Computer Vision with Detectron2

5 (4)
By: Van Vung Pham

Overview of this book

Computer vision is a crucial component of many modern businesses, including automobiles, robotics, and manufacturing, and its market is growing rapidly. This book helps you explore Detectron2, Facebook's next-gen library providing cutting-edge detection and segmentation algorithms. It’s used in research and practical projects at Facebook to support computer vision tasks, and its models can be exported to TorchScript or ONNX for deployment. The book provides you with step-by-step guidance on using existing models in Detectron2 for computer vision tasks (object detection, instance segmentation, key-point detection, semantic detection, and panoptic segmentation). You’ll get to grips with the theories and visualizations of Detectron2’s architecture and learn how each module in Detectron2 works. As you advance, you’ll build your practical skills by working on two real-life projects (preparing data, training models, fine-tuning models, and deployments) for object detection and instance segmentation tasks using Detectron2. Finally, you’ll deploy Detectron2 models into production and develop Detectron2 applications for mobile devices. By the end of this deep learning book, you’ll have gained sound theoretical knowledge and useful hands-on skills to help you solve advanced computer vision tasks using Detectron2.
Table of Contents (20 chapters)
Part 1: Introduction to Detectron2
Part 2: Developing Custom Object Detection Models
Part 3: Developing a Custom Detectron2 Model for Instance Segmentation Tasks
Part 4: Deploying Detectron2 Models into Production

Annotation format conversions

Detectron2 has its data description built based on the COCO annotation format. In other words, it supports registering datasets using the COCO data annotation format. However, other data annotation formats are abundant, and you may download a dataset or use a labeling tool that supports another data format different from COCO. Therefore, this section covers the code snippets used to convert data from the popular Pascal VOC and YOLO formats to COCO style.

Important note

A statement that starts with an exclamation mark (!) means it is a Bash command to be executed in a Jupyter notebook (Google Colab) code cell. If you want to run it in a terminal, you can safely remove this exclamation mark and execute this statement.

By understanding the different data formats as described, it is relatively easy to write code to convert data from one format to another. However, this section uses the pylabel package to perform this conversion to speed up the development...