Search Results for author: Li-Heng Chen

Found 9 papers, 2 papers with code

Estimating the Resize Parameter in End-to-end Learned Image Compression

no code implementations26 Apr 2022 Li-Heng Chen, Christos G. Bampis, Zhi Li, Lukáš Krasula, Alan C. Bovik

By conducting extensive experimental tests on existing deep image compression models, we show results that our new resizing parameter estimation framework can provide Bj{\o}ntegaard-Delta rate (BD-rate) improvement of about 10% against leading perceptual quality engines.

Image Compression

Convolutional Block Design for Learned Fractional Downsampling

no code implementations20 May 2021 Li-Heng Chen, Christos G. Bampis, Zhi Li, Chao Chen, Alan C. Bovik

The layers of convolutional neural networks (CNNs) can be used to alter the resolution of their inputs, but the scaling factors are limited to integer values.

SSIM Video Compression

Regression or Classification? New Methods to Evaluate No-Reference Picture and Video Quality Models

no code implementations30 Jan 2021 Zhengzhong Tu, Chia-Ju Chen, Li-Heng Chen, Yilin Wang, Neil Birkbeck, Balu Adsumilli, Alan C. Bovik

Video and image quality assessment has long been projected as a regression problem, which requires predicting a continuous quality score given an input stimulus.

General Classification Image Quality Assessment +2

Perceptually Optimizing Deep Image Compression

no code implementations3 Jul 2020 Li-Heng Chen, Christos G. Bampis, Zhi Li, Andrey Norkin, Alan C. Bovik

Mean squared error (MSE) and $\ell_p$ norms have largely dominated the measurement of loss in neural networks due to their simplicity and analytical properties.

Image Compression

Multi-Agent Determinantal Q-Learning

1 code implementation ICML 2020 Yaodong Yang, Ying Wen, Li-Heng Chen, Jun Wang, Kun Shao, David Mguni, Wei-Nan Zhang

Though practical, current methods rely on restrictive assumptions to decompose the centralized value function across agents for execution.

Q-Learning

Facial Emotion Recognition Using Deep Learning

no code implementations19 Oct 2019 Ching-Da Wu, Li-Heng Chen

We aim to construct a system that captures real-world facial images through the front camera on a laptop.

Facial Emotion Recognition

ProxIQA: A Proxy Approach to Perceptual Optimization of Learned Image Compression

1 code implementation19 Oct 2019 Li-Heng Chen, Christos G. Bampis, Zhi Li, Andrey Norkin, Alan C. Bovik

By building on top of an existing deep image compression model, we are able to demonstrate a bitrate reduction of as much as $31\%$ over MSE optimization, given a specified perceptual quality (VMAF) level.

Image Compression

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