Search Results for author: Chau-Wai Wong

Found 15 papers, 2 papers with code

Analysis of Coding Gain Due to In-Loop Reshaping

no code implementations7 Dec 2023 Chau-Wai Wong, Chang-Hong Fu, Mengting Xu, Guan-Ming Su

Reshaping, a point operation that alters the characteristics of signals, has been shown capable of improving the compression ratio in video coding practices.

Group Testing with Side Information via Generalized Approximate Message Passing

no code implementations7 Nov 2022 Shu-Jie Cao, Ritesh Goenka, Chau-Wai Wong, Ajit Rajwade, Dror Baron

These samples are arranged into m < n pooled samples, where each pool is obtained by mixing a subset of the n individual samples.

Contact-Free Simultaneous Sensing of Human Heart Rate and Canine Breathing Rate for Animal Assisted Interactions

no code implementations7 Nov 2022 Timothy Holder, Mushfiqur Rahman, Emily Summers, David Roberts, Chau-Wai Wong, Alper Bozkurt

Animal Assisted Interventions (AAIs) involve pleasant interactions between humans and animals and can potentially benefit both types of participants.

Mismatched Estimation in the Distance Geometry Problem

no code implementations12 Jun 2022 Mahmoud Abdelkhalek, Dror Baron, Chau-Wai Wong

We investigate mismatched estimation in the context of the distance geometry problem (DGP).

Gradient Obfuscation Gives a False Sense of Security in Federated Learning

no code implementations8 Jun 2022 Kai Yue, Richeng Jin, Chau-Wai Wong, Dror Baron, Huaiyu Dai

Prior work has shown that the gradient sharing strategies in federated learning can be vulnerable to data reconstruction attacks.

Federated Learning Image Classification +3

Neural Tangent Kernel Empowered Federated Learning

no code implementations7 Oct 2021 Kai Yue, Richeng Jin, Ryan Pilgrim, Chau-Wai Wong, Dror Baron, Huaiyu Dai

The paradigm addresses the challenge of statistical heterogeneity by transmitting update data that are more expressive than those of the conventional FL paradigms.

Federated Learning Privacy Preserving

Federated Learning via Plurality Vote

1 code implementation6 Oct 2021 Kai Yue, Richeng Jin, Chau-Wai Wong, Huaiyu Dai

Federated learning allows collaborative workers to solve a machine learning problem while preserving data privacy.

Federated Learning Quantization

Communication-Efficient Federated Learning via Predictive Coding

1 code implementation2 Aug 2021 Kai Yue, Richeng Jin, Chau-Wai Wong, Huaiyu Dai

In each communication round, we select the predictor and quantizer based on the rate-distortion cost, and further reduce the redundancy with entropy coding.

Data Compression Federated Learning +1

A Multi-Channel Ratio-of-Ratios Method for Noncontact Hand Video Based SpO2 Monitoring Using Smartphone Cameras

no code implementations18 Jul 2021 Xin Tian, Chau-Wai Wong, Sushant M. Ranadive, Min Wu

Experimental results show that our proposed blood oxygen estimation method can reach a mean absolute error of 1. 26% when a pulse oximeter is used as a reference, outperforming the traditional RoR method by 25%.

Remote Blood Oxygen Estimation From Videos Using Neural Networks

no code implementations11 Jul 2021 Joshua Mathew, Xin Tian, Min Wu, Chau-Wai Wong

Blood oxygen saturation (SpO$_2$) is an essential indicator of respiratory functionality and is receiving increasing attention during the COVID-19 pandemic.

Modeling the Nonsmoothness of Modern Neural Networks

no code implementations26 Mar 2021 Runze Liu, Chau-Wai Wong, Huaiyu Dai

Modern neural networks have been successful in many regression-based tasks such as face recognition, facial landmark detection, and image generation.

Face Recognition Facial Landmark Detection +2

Toward Effective Automated Content Analysis via Crowdsourcing

no code implementations12 Jan 2021 Jiele Wu, Chau-Wai Wong, Xinyan Zhao, Xianpeng Liu

For subjective features such as semantic connotation, online workers, known for optimizing their hourly earnings, tend to deteriorate in the quality of their responses as they work longer.

On Microstructure Estimation Using Flatbed Scanners for Paper Surface Based Authentication

no code implementations29 Aug 2020 Runze Liu, Chau-Wai Wong

We analytically show that log(EER) is decreasing linearly in the edge length of a paper patch.

Adaptive Multi-Trace Carving for Robust Frequency Tracking in Forensic Applications

no code implementations14 May 2020 Qiang Zhu, Mingliang Chen, Chau-Wai Wong, Min Wu

In the field of information forensics, many emerging problems involve a critical step that estimates and tracks weak frequency components in noisy signals.

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