Search Results for author: Xuaner Zhang

Found 17 papers, 4 papers with code

LEDiff: Latent Exposure Diffusion for HDR Generation

no code implementations19 Dec 2024 Chao Wang, Zhihao Xia, Thomas Leimkuehler, Karol Myszkowski, Xuaner Zhang

While consumer displays increasingly support more than 10 stops of dynamic range, most image assets such as internet photographs and generative AI content remain limited to 8-bit low dynamic range (LDR), constraining their utility across high dynamic range (HDR) applications.

Image Generation

Instruction-based Image Manipulation by Watching How Things Move

no code implementations16 Dec 2024 Mingdeng Cao, Xuaner Zhang, Yinqiang Zheng, Zhihao Xia

This paper introduces a novel dataset construction pipeline that samples pairs of frames from videos and uses multimodal large language models (MLLMs) to generate editing instructions for training instruction-based image manipulation models.

Image Manipulation

Generative Portrait Shadow Removal

no code implementations7 Oct 2024 Jae Shin Yoon, Zhixin Shu, Mengwei Ren, Xuaner Zhang, Yannick Hold-Geoffroy, Krishna Kumar Singh, He Zhang

For robust and natural shadow removal, we propose to train the diffusion model with a compositional repurposing framework: a pre-trained text-guided image generation model is first fine-tuned to harmonize the lighting and color of the foreground with a background scene by using a background harmonization dataset; and then the model is further fine-tuned to generate a shadow-free portrait image via a shadow-paired dataset.

Image Generation Shadow Removal

COMPOSE: Comprehensive Portrait Shadow Editing

no code implementations25 Aug 2024 Andrew Hou, Zhixin Shu, Xuaner Zhang, He Zhang, Yannick Hold-Geoffroy, Jae Shin Yoon, Xiaoming Liu

Existing portrait relighting methods struggle with precise control over facial shadows, particularly when faced with challenges such as handling hard shadows from directional light sources or adjusting shadows while remaining in harmony with existing lighting conditions.

Disentanglement

Explorative Inbetweening of Time and Space

no code implementations21 Mar 2024 Haiwen Feng, Zheng Ding, Zhihao Xia, Simon Niklaus, Victoria Abrevaya, Michael J. Black, Xuaner Zhang

We introduce bounded generation as a generalized task to control video generation to synthesize arbitrary camera and subject motion based only on a given start and end frame.

Denoising Video Generation

Magic Fixup: Streamlining Photo Editing by Watching Dynamic Videos

no code implementations19 Mar 2024 Hadi AlZayer, Zhihao Xia, Xuaner Zhang, Eli Shechtman, Jia-Bin Huang, Michael Gharbi

We show that by using simple segmentations and coarse 2D manipulations, we can synthesize a photorealistic edit faithful to the user's input while addressing second-order effects like harmonizing the lighting and physical interactions between edited objects.

Dr. Bokeh: DiffeRentiable Occlusion-aware Bokeh Rendering

no code implementations CVPR 2024 Yichen Sheng, Zixun Yu, Lu Ling, Zhiwen Cao, Xuaner Zhang, Xin Lu, Ke Xian, Haiting Lin, Bedrich Benes

Dr. Bokeh then takes the layered representation and user-defined lens parameters to render photo-realistic lens blur based on the novel occlusion-aware bokeh rendering method.

Restoration by Generation with Constrained Priors

no code implementations CVPR 2024 Zheng Ding, Xuaner Zhang, Zhuowen Tu, Zhihao Xia

We propose a method to adapt a pretrained diffusion model for image restoration by simply adding noise to the input image to be restored and then denoise.

Denoising Image Restoration

DiffusionRig: Learning Personalized Priors for Facial Appearance Editing

1 code implementation CVPR 2023 Zheng Ding, Xuaner Zhang, Zhihao Xia, Lars Jebe, Zhuowen Tu, Xiuming Zhang

On a high level, DiffusionRig learns to map simplistic renderings of 3D face models to realistic photos of a given person.

LightPainter: Interactive Portrait Relighting with Freehand Scribble

no code implementations CVPR 2023 Yiqun Mei, He Zhang, Xuaner Zhang, Jianming Zhang, Zhixin Shu, Yilin Wang, Zijun Wei, Shi Yan, HyunJoon Jung, Vishal M. Patel

Recent portrait relighting methods have achieved realistic results of portrait lighting effects given a desired lighting representation such as an environment map.

SunStage: Portrait Reconstruction and Relighting using the Sun as a Light Stage

no code implementations CVPR 2023 Yifan Wang, Aleksander Holynski, Xiuming Zhang, Xuaner Zhang

Our method only requires the user to capture a selfie video outdoors, rotating in place, and uses the varying angles between the sun and the face as guidance in joint reconstruction of facial geometry, reflectance, camera pose, and lighting parameters.

Novel View Synthesis

Time-Travel Rephotography

1 code implementation22 Dec 2020 Xuan Luo, Xuaner Zhang, Paul Yoo, Ricardo Martin-Brualla, Jason Lawrence, Steven M. Seitz

Many historical people were only ever captured by old, faded, black and white photos, that are distorted due to the limitations of early cameras and the passage of time.

Colorization Denoising +1

Zoom to Learn, Learn to Zoom

no code implementations CVPR 2019 Xuaner Zhang, Qifeng Chen, Ren Ng, Vladlen Koltun

We show how to obtain such ground-truth data via optical zoom and contribute a dataset, SR-RAW, for real-world computational zoom.

Super-Resolution

Synthetic Defocus and Look-Ahead Autofocus for Casual Videography

no code implementations15 May 2019 Xuaner Zhang, Kevin Matzen, Vivien Nguyen, Dillon Yao, You Zhang, Ren Ng

We present a system that synthetically renders refocusable video from a deep DOF video shot with a smartphone, and analyzes future video frames to deliver context-aware autofocus for the current frame.

BIG-bench Machine Learning Saliency Detection

Single Image Reflection Separation with Perceptual Losses

3 code implementations CVPR 2018 Xuaner Zhang, Ren Ng, Qifeng Chen

Our loss function includes two perceptual losses: a feature loss from a visual perception network, and an adversarial loss that encodes characteristics of images in the transmission layers.

Image Enhancement Reflection Removal +1

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