Image annotation is commonly used in systems that involve face recognition, computer vision, and more. It is of further two types: 2D and 3D annotation. 2D data refers to images and videos. 3D data includes point clouds and meshes. Data from cameras, ion, electron, or scanning probe microscopes also comes under the category of 3D data. https://dataannotation.co/what-you-need-to-know-about-3d-annotation/