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Alex Colburn

7 accepted papers

2025

BADGR: Bundle Adjustment Diffusion Conditioned by Gradients for Wide-Baseline Floor Plan Reconstruction

CVPR 2025highlight

Reconstructing precise camera poses and floor plan layouts from wide-baseline RGB panoramas is a difficult and unsolved problem. We introduce BADGR, a novel diffusion model that jointly performs reconstruction and bundle adjustment (BA) to refine poses and layouts from a coarse state, using 1D floor…

Cited by 0SourcePDFScholar
2023

AutoFocusFormer: Image Segmentation off the Grid

CVPR 2023poster

Real world images often have highly imbalanced content density. Some areas are very uniform, e.g., large patches of blue sky, while other areas are scattered with many small objects. Yet, the commonly used successive grid downsampling strategy in convolutional deep networks treats all areas equally.…

2023

FineRecon: Depth-aware Feed-forward Network for Detailed 3D Reconstruction

ICCV 2023poster

Recent works on 3D reconstruction from posed images have demonstrated that direct inference of scene-level 3D geometry without test-time optimization is feasible using deep neural networks, showing remarkable promise and high efficiency. However, the reconstructed geometry, typically represented as…

Cited by 27PDFcodeScholar
2023

LivePose: Online 3D Reconstruction from Monocular Video with Dynamic Camera Poses

ICCV 2023oral

Dense 3D reconstruction from RGB images traditionally assumes static camera pose estimates. This assumption has endured, even as recent works have increasingly focused on real-time methods for mobile devices. However, the assumption of a fixed pose for each image does not hold for online execution:…

Cited by 4PDFcodeScholar
2022

Generative Multiplane Images: Making a 2D GAN 3D-Aware

ECCV 2022poster

"What is really needed to make an existing 2D GAN 3Daware? To answer this question, we modify a classical GAN, i.e., StyleGANv2, as little as possible. We find that only two modifications are absolutely necessary: 1) a multiplane image style generator branch which produces a set of alpha maps condit…

2020

Equivariant Neural Rendering

ICML 2020poster

We propose a framework for learning neural scene representations directly from images, without 3D supervision. Our key insight is that 3D structure can be imposed by ensuring that the learned representation transforms like a real 3D scene. Specifically, we introduce a loss which enforces equivarianc…

Cited by 77SourcePDFScholar
2018

LayoutNet: Reconstructing the 3D Room Layout From a Single RGB Image

CVPR 2018poster

We propose an algorithm to predict room layout from a single image that generalizes across panoramas and perspective images, cuboid layouts and more general layouts (e.g. "L"-shape room). Our method operates directly on the panoramic image, rather than decomposing into perspective images as do recen…