📝 Publications

Guardians of the Hair: Rescuing Soft Boundaries in Depth, Stereo, and Novel Views

Xiang Zhang, Yang Zhang, Lukas Mehl, Markus Gross^†, Christopher Schroers^†

[arXiv]

• We present HairGuard to capture, model, and reconstruct fine-grained soft boundary details in 3D vision tasks, achieving state-of-the-art performance on monocular depth estimation, stereo conversion, and novel view synthesis.
• We leverage image matting datasets for training, enabling HairGuard to automatically identify and fix soft boundaries without relying on manually crafted cues like trimaps. A plug-and-play depth fixer is proposed for precise refinement, alongside a color fuser for high-quality view synthesis.

High-Fidelity Novel View Synthesis via Splatting-Guided Diffusion

Xiang Zhang, Yang Zhang, Lukas Mehl, Markus Gross^†, Christopher Schroers^†

[Website] [Paper] [arXiv] [Supp] [Video]

• We introduce SplatDiff, a pixel-splatting-guided video diffusion model for synthesizing novel views with consistent geometry and high-fidelity texture from a single image.
• SplatDiff excels in single-view novel view synthesis, sparse-view novel view synthesis, and stereo video conversion, demonstrating remarkable crossdomain and cross-task performance.

BetterDepth: Plug-and-Play Diffusion Refiner for Zero-Shot Monocular Depth Estimation

Xiang Zhang, Bingxin Ke, Hayko Riemenschneider, Nando Metzger, Anton Obukhov, Markus Gross^†, Konrad Schindler, Christopher Schroers^†

[Website] [arXiv] [Poster]

• We propose BetterDepth to boost zero-shot MDE methods with plug-and-play diffusion refiners, achieving robust affine-invariant MDE performance with fine-grained details.
• We design global pre-alignment and local patch masking strategies to enable learning detail refinement from small-scale synthetic datasets while preserving rich prior knowledge from pre-trained MDE models for zero-shot transfer.

HiT-SR: Hierarchical Transformer for Efficient Image Super-Resolution

Xiang Zhang, Yulun Zhang, Fisher Yu

[Code] [Supp] [Video]

• We propose a simple yet effective strategy (HiT-SR) to convert popular transformer-based SR methods to our hierarchical transformers, boosting SR performance by exploiting multi-scale features and long-range dependencies.
• We design a spatial-channel correlation method to efficiently leverage spatial and channel features with linear computational complexity to window sizes, enabling utilization of large hierarchical windows, e.g., $64\times64$ windows.

Generalizing Event-Based Motion Deblurring in Real-World Scenarios

Xiang Zhang, Lei Yu^†, Wen Yang, Jianzhuang Liu, Gui-Song Xia

[Code] [Dataset] [Youtube]

• A scale-aware network is designed to allow flexible setups of input spatial resolutions and enable learning from different temporal scales of motion blur.
• A self-supervised learning framework is proposed for model training with real-world data and performance generalization in spatial and temporal domains.
• A multi-scale real-world blurry dataset (MS-RBD) is constructed to facilitate the evaluation of deblurring performance in real-world scenarios.

Learning to See Through with Events

Lei Yu^†, Xiang Zhang, Wei Liao, Wen Yang, Gui-Song Xia

[Code] [Dataset] [Bilibili]

• We provide more analysis of the E-SAI framework, including more details on the components of triggered events and the corresponding epipolar geometry.
• We design a spatial transformer network to automatically refocus the events collected by a moving event camera with fronto-parallel uniform motion, relaxing the dependence on prior information such as camera velocity and target depth.

Unifying Motion Deblurring and Frame Interpolation with Events

Xiang Zhang, Lei Yu^†

[Code] [Youtube]

• We present a unified framework for event-based video deblurring and interpolation (EVDI) that generates arbitrarily high frame-rate sharp videos from blurry inputs.
• By utilizing the constraints between cross-modal frames and events, a fully self-supervised learning method is proposed to enable network training with real-world data without requiring ground-truth images.

Spiking Sparse Recovery with Non-convex Penalties

Xiang Zhang, Lei Yu^†, Gang Zheng, Yonina C. Eldar

[Paper]

• We present an adaptive sparse spiking recovery (A-SSR) algorithm to solve a class of non-convex regularized SR problems with spiking neural networks.
• When implemented on the neuromorphic Loihi chip, our A-SSR can solve sparse recovery problems with approximately 1% of the power consumption of fast iterative shrinkage-thresholding algorithm.

Event-based Synthetic Aperture Imaging with a Hybrid Network

Xiang Zhang^*, Wei Liao^*, Lei Yu^†, Wen Yang, Gui-Song Xia

[Code] [Dataset] [Youtube]

• An event-based synthetic aperture imaging (E-SAI) algorithm is proposed to see through dense occlusions even under extreme lighting conditions.
• A hybrid network composed of an spiking encoder and a convolutional decoder is designed to mitigate the disturbances from occlusions and guarantee the overall reconstruction performance.