Search Results for author: Di Zhao

Found 13 papers, 2 papers with code

MCNet: A crowd denstity estimation network based on integrating multiscale attention module

no code implementations29 Mar 2024 Qiang Guo, Rubo Zhang, Di Zhao

Finally, this paper integrates IMA module and the lightweight crowd texture feature extraction network to construct the MCNet, and validate the feasibility of this network on image classification dataset: Cifar10 and four crowd density datasets: PETS2009, Mall, QUT and SH_METRO to validate the MCNet whether can be a suitable solution for crowd density estimation in metro video surveillance where there are image processing challenges such as high density, high occlusion, perspective distortion and limited hardware resources.

Density Estimation Image Classification

A Cyclic Small Phase Theorem

no code implementations1 Dec 2023 Chao Chen, Wei Chen, Di Zhao, Jianqi Chen, Li Qiu

This paper introduces a brand-new phase definition called the segmental phase for multi-input multi-output linear time-invariant systems.

Radiomics-Informed Deep Learning for Classification of Atrial Fibrillation Sub-Types from Left-Atrium CT Volumes

1 code implementation14 Aug 2023 Weihang Dai, Xiaomeng Li, Taihui Yu, Di Zhao, Jun Shen, Kwang-Ting Cheng

Furthermore, we ensure complementary information is learned by deep and radiomic features by designing a novel feature de-correlation loss.

feature selection

Converse negative imaginary theorems

no code implementations3 Jun 2023 Sei Zhen Khong, Di Zhao, Alexander Lanzon

We also establish a non-existence result that no stable system can robustly stabilise all marginally stable NI uncertainty, thereby showing that the uncertainty class of NI systems is too large as far as robust feedback stability is concerned, thus justifying the consideration of subclasses of NI systems with constrained static or instantaneous gains.

On the exponential convergence of input-output signals of nonlinear feedback systems

no code implementations4 Jun 2022 Sei Zhen Khong, Lanlan Su, Di Zhao

We show that the integral-constraint-based robust feedback stability theorem for certain Lurye systems exhibits the property that the endogenous input-output signals enjoy an exponential convergence rate for all initial conditions of the linear time-invariant subsystem.

When Small Gain Meets Small Phase

no code implementations16 Jan 2022 Di Zhao, Wei Chen, Li Qiu

In this paper, we investigate the feedback stability of multiple-input multiple-output linear time-invariant systems with combined gain and phase information.

LEMMA

A Frequency-Domain Approach to Nonlinear Negative Imaginary Systems Analysis

no code implementations30 Sep 2021 Di Zhao, Chao Chen, Sei Zhen Khong

In this study, we extend the theory of negative imaginary (NI) systems to a nonlinear framework using a frequency-domain approach.

The Singular Angle of Nonlinear Systems

no code implementations3 Sep 2021 Chao Chen, Wei Chen, Di Zhao, Sei Zhen Khong, Li Qiu

It is, thus, different from the recently appeared nonlinear system phase which adopts the complexification of real-valued signals using the Hilbert transform.

Phase of Nonlinear Systems

no code implementations30 Nov 2020 Chao Chen, Di Zhao, Wei Chen, Sei Zhen Khong, Li Qiu

A nonlinear small phase theorem is then established for feedback stability analysis of semi-sectorial systems.

Bidirectional RNN-based Few-shot Training for Detecting Multi-stage Attack

no code implementations9 May 2019 Di Zhao, Jiqiang Liu, Jialin Wang, Wenjia Niu, Endong Tong, Tong Chen, Gang Li

"Feint Attack" is simulated by the real attack inserted in the normal causal attack chain, and the addition of the real attack destroys the causal relationship of the original attack chain.

Attribute Clustering

End-to-End Denoising of Dark Burst Images Using Recurrent Fully Convolutional Networks

1 code implementation16 Apr 2019 Di Zhao, Lan Ma, Songnan Li, Dahai Yu

When taking photos in dim-light environments, due to the small amount of light entering, the shot images are usually extremely dark, with a great deal of noise, and the color cannot reflect real-world color.

Image Denoising

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