X-Ray to CT Rigid Registration Using Scene Coordinate Regression

1 code implementation • 25 Nov 2023 • Pragyan Shrestha, Chun Xie, Hidehiko Shishido, Yuichi Yoshii, Itary Kitahara

The scene coordinates are defined as the intersection of the back-projected rays from a pixel toward the 3D model.

Computed Tomography (CT) regression

OmniVoxel: A Fast and Precise Reconstruction Method of Omnidirectional Neural Radiance Field

no code implementations • 12 Aug 2022 • Qiaoge Li, Itsuki Ueda, Chun Xie, Hidehiko Shishido, Itaru Kitahara

Instead of using a fully implicit representation of rays for radiance field reconstruction, we adopt feature voxels that contain density and color features in tensors.

Neural Density-Distance Fields

1 code implementation • 29 Jul 2022 • Itsuki Ueda, Yoshihiro Fukuhara, Hirokatsu Kataoka, Hiroaki Aizawa, Hidehiko Shishido, Itaru Kitahara

However, it is difficult to achieve high localization performance by only density fields-based methods such as Neural Radiance Field (NeRF) since they do not provide density gradient in most empty regions.

Novel View Synthesis Visual Localization