Hussein Fadl Hassan Hassan Osman Osman

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Enforcing Connectivity of 3D Linear Structures Using Their 2D Projections

Pascal Fua, Mateusz Kozinski, Doruk Oner, Hussein Fadl Hassan Hassan Osman Osman

Many biological and medical tasks require the delineation of 3D curvilinear structures such as blood vessels and neurites from image volumes. This is typically done using neural networks trained by minimizing voxel-wise loss functions that do not capture the topological properties of these structures. As a result, the connectivity of the recovered structures is often wrong, which lessens their usefulness. In this paper, we propose to improve the 3D connectivity of our results by minimizing a sum of topology-aware losses on their 2D projections. This suffices to increase the accuracy and to reduce the annotation effort required to provide the required annotated training data.

SPRINGER INTERNATIONAL PUBLISHING AG2022

PlaceNet: A multi-scale semantic-aware model for visual loop closure detection

Hussein Fadl Hassan Hassan Osman Osman

Loop closure detection helps simultaneous localization and mapping systems reduce map and state uncertainty via recognizing previously visited places along the path of a mobile robot. However, visual loop closure detection is susceptible to scenes with dynamic objects and changes in illumination, background, and weather conditions. This paper introduces PlaceNet, a novel plug-and-play model for visual loop closure detection. PlaceNet is a multi-scale deep autoencoder network augmented with a semantic fusion layer for scene understanding. The main idea of PlaceNet is to learn where not to look in a dynamic scene full of moving objects, i.e., avoid being distracted by dynamic objects to focus on the scene landmarks instead. We train PlaceNet to identify dynamic objects in scenes via learning a grayscale semantic map indicating the position of static and moving objects in the image. PlaceNet generates semantic-aware deep features that are robust to dynamic environments and scale invariant. We evaluated our method on different challenging indoor and outdoor benchmarks. To conclude, PlaceNet demonstrated competitive results compared to the state-of-the-art methods over various datasets used in our experiments.

PERGAMON-ELSEVIER SCIENCE LTD2022