SageMaker Ground Truth helps you build highly accurate training datasets quickly. The service offers easy access to your own and third-party human labelers and provides them with built-in workflows and interfaces for labeling tasks. SageMaker Ground Truth offers a built-in labeling workflow and interface for semantic segmentation, which is a computer vision ML technique that involves assigning class labels to individual pixels in an image.
With this new feature, you can work up to ten times faster on semantic segmentation tasks. Instead of drawing a tightly fitting polygon or using the brush tool to capture an object in an image, you draw four points: one at the top-most, bottom-most, left-most, and right-most points of the object. Ground Truth takes these four points as input and uses the Deep Extreme Cut (DEXTR) algorithm to produce a tightly fitting mask around the object.