Ji Hou (侯骥)

I am a Research Scientist at Meta Generative AI. Previously, I did my Ph.D. at TUM Visual Computing Group headed by Prof. Matthias Niessner, where I work on Computer Vision and 3D Scene Understanding. During my Ph.D., I did an internship at Facebook AI Research (FAIR) with Saining Xie and Benjamin Graham on 3D representation and data-efficient learning. Before that, I obtained my master at RWTH Computer Vision Group headed by Prof. Bastian Leibe, where I studied on Computer Vision and Machine Learning.

I am interested in research and applications on 3D Computer Vision, e.g. 3D Reconstruction, VR/AR, robotics and autonomous driving etc.

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NeRF-Det is a novel method for 3D detection with posed RGB images as input. Our method makes novel use of NeRF in an end-to-end manner to explicitly estimate 3D geometry, thereby improving 3D detection performance.

We introduce RoITr, a Rotation-Invariant Transformer to cope with the pose variations in the point cloud matching task. On the challenging 3DLoMatch benchmark, RoITr surpasses the existing methods by at least 13 and 5 percentage points in terms of the Inlier Ratio and the Registration Recall, respectively

We demonstrate the Mask3D is particularly effective in embedding 3D priors into the powerful 2D ViT backbone, enabling improved representation learning for various scene understanding tasks, such as semantic segmentation, instance segmentation and object detection.

We introduce PCR-CG: a novel 3D point cloud registration module explicitly embedding the color signals into geometry representation. With our designed 2D-3D projection module, the pixel features in a square region centered at correspondences perceived from images are effectively correlated with point cloud representations.

Recent advances in 3D perception have shown impressive progress in understanding geometric structures of 3D shapes and even scenes. Inspired by these advances in geometric understanding, we aim to imbue image-based perception with representations learned under geometric constraints.

Inspired by 2D panoptic segmentation, we propose to unify the tasks of geometric reconstruction, 3D semantic segmentation, and 3D instance segmentation into the task of panoptic 3D scene reconstruction -- from a single RGB image, predicting the complete geometric reconstruction of the scene in the camera frustum of the image, along with semantic and instance segmentations.

Our study reveals that exhaustive labelling of 3D point clouds might be unnecessary; and remarkably, on ScanNet, even using 0.1% of point labels, we still achieve 89% (instance segmentation) and 96% (semantic segmentation) of the baseline performance that uses full annotations.

In this work, we introduce RfD-Net that jointly detects and reconstructs dense object surfaces directly from raw point clouds. Instead of representing scenes with regular grids, our method leverages the sparsity of point cloud data and focuses on predicting shapes that are recognized with high objectness.

This paper introduces the task of semantic instance completion: from an incomplete, RGB-D scan of a scene, we detect the individual object instances comprising the scene and jointly infer their complete object geometry.

We introduce 3D-SIS, a novel neural network architecture for 3D semantic instance segmentation in commodity RGB-D scans. The core idea of our method is to jointly learn from both geometric and color signal, thus enabling accurate instance predictions.

Credits: Jon Barron