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Fall 2023 GRASP Seminar: Fuxin Li, Oregon State University, “From Sparse to Dense, and back to Sparse again?”

October 24, 2023 @ 10:30 am - 11:30 am

*This seminar will be held in-person ONLY in Raisler Lounge. The seminar will NOT be recorded.


Computer vision architectures used to be built on a sparse sample of points in the 80s and 90s. In the 2000s, dense models started to become popular for visual recognition as heuristically defined sparse models do not cover all the important parts of an image. However, with deep learning and end-to-end training approaches, this does not have to continue and sparse models may still have significant advantages in saving unnecessary computation as well as being more flexible. In this talk, I will talk about the deep point cloud convolutional backbones that we have developed in the past few years, including the most recent work PointConvFormer that outperforms grid-based convolutional approaches. As applications of those point-based networks, I will talk about two recent works, including AutoFocusFormer, that uses point cloud backbones and decoders to work on 2D image recognition, with a novel adaptive downsampling module that enables the end-to-end learning of adaptive downsampling. This is very helpful for detecting tiny objects faraway in the scene which would have been decimated by conventional grid downsampling approaches. Finally, I will illustrate the use of point convolution backbones in generative models with a recent work in diverse point cloud completion.


Fuxin Li

Fuxin Li

Fuxin Li is currently an associate professor in the School of Electrical Engineering and Computer Science at Oregon State University. He has held research positions in Apple Inc., University of Bonn and Georgia Institute of Technology. He had obtained a Ph.D. degree in the Institute of Automation, Chinese Academy of Sciences in 2009. He has won an NSF CAREER award, an Amazon Research Award, (co-)won the PASCAL VOC semantic segmentation challenges from 2009-2012, and led a team to the 4th place finish in the DAVIS Video Segmentation challenge 2017. He has published more than 70 papers in computer vision, machine learning and natural language processing. His main research interests are point cloud deep networks, human understanding of deep learning, video object segmentation, multi-target tracking and uncertainty estimation in deep learning.


October 24, 2023
10:30 am - 11:30 am
Event Category:


Raisler Lounge, Towne 225
220 S. 33rd Street
Philadelphia, PA 19104
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