COCO Synth provides tools for creating synthetic COCO datasets.
This code repo is a companion to a Udemy course for developers who'd like a step by step walk-through of how to create a synthetic COCO dataset from scratch. When you enroll, you'll get a full walkthrough of how all of the code in this repo works. When you finish, you'll have a COCO dataset with your own custom categories and a trained Mask R-CNN.
Learn more at https://www.immersivelimit.com/course/creating-coco-datasets
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Check out the Getting Started guide. It will walk you through the scripts with a sample dataset.