Search Results for author: David Bull

Found 40 papers, 8 papers with code

MTKD: Multi-Teacher Knowledge Distillation for Image Super-Resolution

no code implementations15 Apr 2024 YuXuan Jiang, Chen Feng, Fan Zhang, David Bull

Knowledge distillation (KD) has emerged as a promising technique in deep learning, typically employed to enhance a compact student network through learning from their high-performance but more complex teacher variant.

Image Super-Resolution Knowledge Distillation

A Spatio-temporal Aligned SUNet Model for Low-light Video Enhancement

no code implementations4 Mar 2024 Ruirui Lin, Nantheera Anantrasirichai, Alexandra Malyugina, David Bull

Distortions caused by low-light conditions are not only visually unpleasant but also degrade the performance of computer vision tasks.

SSIM Video Enhancement

Feature Denoising For Low-Light Instance Segmentation Using Weighted Non-Local Blocks

no code implementations28 Feb 2024 Joanne Lin, Nantheera Anantrasirichai, David Bull

Instance segmentation for low-light imagery remains largely unexplored due to the challenges imposed by such conditions, for example shot noise due to low photon count, color distortions and reduced contrast.

Denoising Instance Segmentation +1

Rate-Quality or Energy-Quality Pareto Fronts for Adaptive Video Streaming?

no code implementations10 Feb 2024 Angeliki Katsenou, Xinyi Wang, Daniel Schien, David Bull

Adaptive video streaming is a key enabler for optimising the delivery of offline encoded video content.

BVI-Lowlight: Fully Registered Benchmark Dataset for Low-Light Video Enhancement

no code implementations3 Feb 2024 Nantheera Anantrasirichai, Ruirui Lin, Alexandra Malyugina, David Bull

Low-light videos often exhibit spatiotemporal incoherent noise, leading to poor visibility and compromised performance across various computer vision applications.

Video Enhancement

Immersive Video Compression using Implicit Neural Representations

1 code implementation2 Feb 2024 Ho Man Kwan, Fan Zhang, Andrew Gower, David Bull

In this paper we, for the first time, extend their application to immersive (multi-view) videos, by proposing MV-HiNeRV, a new INR-based immersive video codec.

Video Compression

Compressing Deep Image Super-resolution Models

no code implementations31 Dec 2023 YuXuan Jiang, Jakub Nawala, Fan Zhang, David Bull

Deep learning techniques have been applied in the context of image super-resolution (SR), achieving remarkable advances in terms of reconstruction performance.

Image Super-Resolution Knowledge Distillation

Comparative Study of Hardware and Software Power Measurements in Video Compression

no code implementations19 Dec 2023 Angeliki Katsenou, Xinyi Wang, Daniel Schien, David Bull

The environmental impact of video streaming services has been discussed as part of the strategies towards sustainable information and communication technologies.

Video Compression

Full-reference Video Quality Assessment for User Generated Content Transcoding

no code implementations19 Dec 2023 Zihao Qi, Chen Feng, Duolikun Danier, Fan Zhang, Xiaozhong Xu, Shan Liu, David Bull

In this work, we observe that existing full-/no-reference quality metrics fail to accurately predict the perceptual quality difference between transcoded UGC content and the corresponding unpristine references.

Video Quality Assessment Visual Question Answering (VQA)

RankDVQA-mini: Knowledge Distillation-Driven Deep Video Quality Assessment

no code implementations14 Dec 2023 Chen Feng, Duolikun Danier, Haoran Wang, Fan Zhang, Benoit Vallade, Alex Mackin, David Bull

Deep learning-based video quality assessment (deep VQA) has demonstrated significant potential in surpassing conventional metrics, with promising improvements in terms of correlation with human perception.

Knowledge Distillation Model Compression +2

BVI-Artefact: An Artefact Detection Benchmark Dataset for Streamed Videos

no code implementations14 Dec 2023 Chen Feng, Duolikun Danier, Fan Zhang, Alex Mackin, Andy Collins, David Bull

Professionally generated content (PGC) streamed online can contain visual artefacts that degrade the quality of user experience.

Accelerating Learnt Video Codecs with Gradient Decay and Layer-wise Distillation

no code implementations5 Dec 2023 Tianhao Peng, Ge Gao, Heming Sun, Fan Zhang, David Bull

In recent years, end-to-end learnt video codecs have demonstrated their potential to compete with conventional coding algorithms in term of compression efficiency.

Video Compression

Wavelet-based Topological Loss for Low-Light Image Denoising

no code implementations16 Sep 2023 Alexandra Malyugina, Nantheera Anantrasirichai, David Bull

Despite extensive research conducted in the field of image denoising, many algorithms still heavily depend on supervised learning and their effectiveness primarily relies on the quality and diversity of training data.

Image Denoising

UGC Quality Assessment: Exploring the Impact of Saliency in Deep Feature-Based Quality Assessment

no code implementations13 Aug 2023 Xinyi Wang, Angeliki Katsenou, David Bull

Preliminary results indicate that high correlations are achieved by using only deep features while adding saliency is not always boosting the performance.

HiNeRV: Video Compression with Hierarchical Encoding-based Neural Representation

1 code implementation NeurIPS 2023 Ho Man Kwan, Ge Gao, Fan Zhang, Andrew Gower, David Bull

Learning-based video compression is currently a popular research topic, offering the potential to compete with conventional standard video codecs.

Model Compression Quantization +1

LDMVFI: Video Frame Interpolation with Latent Diffusion Models

2 code implementations16 Mar 2023 Duolikun Danier, Fan Zhang, David Bull

Existing works on video frame interpolation (VFI) mostly employ deep neural networks that are trained by minimizing the L1, L2, or deep feature space distance (e. g. VGG loss) between their outputs and ground-truth frames.

Video Frame Interpolation

BVI-VFI: A Video Quality Database for Video Frame Interpolation

2 code implementations3 Oct 2022 Duolikun Danier, Fan Zhang, David Bull

In order to narrow this research gap, we have developed a new video quality database named BVI-VFI, which contains 540 distorted sequences generated by applying five commonly used VFI algorithms to 36 diverse source videos with various spatial resolutions and frame rates.

Video Frame Interpolation

A Topological Loss Function: Image Denoising on a Low-Light Dataset

no code implementations9 Aug 2022 Alexandra Malyugina, Nantheera Anantrasirichai, David Bull

The loss function is a combination of $\ell_1$ or $\ell_2$ losses with the new persistence-based topological loss.

Image Denoising

Enhancing HDR Video Compression through CNN-based Effective Bit Depth Adaptation

1 code implementation18 Jul 2022 Chen Feng, Zihao Qi, Duolikun Danier, Fan Zhang, Xiaozhong Xu, Shan Liu, David Bull

In this work, we modify the MFRNet network architecture to enable multiple frame processing, and the new network, multi-frame MFRNet, has been integrated into the EBDA framework using two Versatile Video Coding (VVC) host codecs: VTM 16. 2 and the Fraunhofer Versatile Video Encoder (VVenC 1. 4. 0).

Video Compression

Enhancing VVC with Deep Learning based Multi-Frame Post-Processing

no code implementations19 May 2022 Duolikun Danier, Chen Feng, Fan Zhang, David Bull

This paper describes a CNN-based multi-frame post-processing approach based on a perceptually-inspired Generative Adversarial Network architecture, CVEGAN.

Generative Adversarial Network Image Compression

Sparse InSAR Data 3D Inpainting for Ground Deformation Detection Along the Rail Corridor

no code implementations4 Mar 2022 Odysseas Pappas, Juliet Biggs, David Bull, Alin Achim, Nantheera Anantrasirichai

Monitoring of ground movement close to the rail corridor, such as that associated with landslips caused by ground subsidence and/or uplift, is of great interest for the detection and prevention of possible railway faults.

3D Inpainting

A CNN-based Post-Processor for Perceptually-Optimized Immersive Media Compression

no code implementations25 Feb 2022 Angeliki Katsenou, Fan Zhang, David Bull

In recent years, resolution adaptation based on deep neural networks has enabled significant performance gains for conventional (2D) video codecs.

RankDVQA: Deep VQA based on Ranking-inspired Hybrid Training

no code implementations17 Feb 2022 Chen Feng, Duolikun Danier, Fan Zhang, David Bull

In recent years, deep learning techniques have shown significant potential for improving video quality assessment (VQA), achieving higher correlation with subjective opinions compared to conventional approaches.

Video Quality Assessment Visual Question Answering (VQA)

A Subjective Quality Study for Video Frame Interpolation

no code implementations15 Feb 2022 Duolikun Danier, Fan Zhang, David Bull

Video frame interpolation (VFI) is one of the fundamental research areas in video processing and there has been extensive research on novel and enhanced interpolation algorithms.

SSIM Video Frame Interpolation

Enhancing Deformable Convolution based Video Frame Interpolation with Coarse-to-fine 3D CNN

no code implementations15 Feb 2022 Duolikun Danier, Fan Zhang, David Bull

This paper presents a new deformable convolution-based video frame interpolation (VFI) method, using a coarse to fine 3D CNN to enhance the multi-flow prediction.

Video Frame Interpolation

ST-MFNet: A Spatio-Temporal Multi-Flow Network for Frame Interpolation

3 code implementations CVPR 2022 Duolikun Danier, Fan Zhang, David Bull

Video frame interpolation (VFI) is currently a very active research topic, with applications spanning computer vision, post production and video encoding.

Texture Synthesis Video Frame Interpolation

Analysis of Vision-based Abnormal Red Blood Cell Classification

no code implementations1 Jun 2021 Annika Wong, Nantheera Anantrasirichai, Thanarat H. Chalidabhongse, Duangdao Palasuwan, Attakorn Palasuwan, David Bull

This paper presents an automated process utilising the advantages of machine learning to increase capacity and standardisation of cell abnormality detection, and its performance is analysed.

Anomaly Detection BIG-bench Machine Learning +5

A Subjective Study on Videos at Various Bit Depths

no code implementations18 Mar 2021 Alex Mackin, Di Ma, Fan Zhang, David Bull

Bit depth adaptation, where the bit depth of a video sequence is reduced before transmission and up-sampled during display, can potentially reduce data rates with limited impact on perceptual quality.

Enhancing VMAF through New Feature Integration and Model Combination

no code implementations10 Mar 2021 Fan Zhang, Angeliki Katsenou, Christos Bampis, Lukas Krasula, Zhi Li, David Bull

VMAF is a machine learning based video quality assessment method, originally designed for streaming applications, which combines multiple quality metrics and video features through SVM regression.

regression Video Quality Assessment

Texture-aware Video Frame Interpolation

no code implementations26 Feb 2021 Duolikun Danier, David Bull

Our study shows that video texture has significant impact on the performance of frame interpolation models and it is beneficial to have separate models specifically adapted to these texture classes, instead of training a single model that tries to learn generic motion.

Texture Classification Video Compression +1

Contextual colorization and denoising for low-light ultra high resolution sequences

no code implementations5 Jan 2021 N. Anantrasirichai, David Bull

Experimental results show that our method outperforms existing approaches in terms of subjective quality and that it is robust to variations in brightness levels and noise.

Colorization Denoising +1

A simulation environment for drone cinematography

no code implementations3 Oct 2020 Fan Zhang, David Hall, Tao Xu, Stephen Boyle, David Bull

Methods for environmental image capture, 3D reconstruction (photogrammetry) and the creation of foreground assets are presented along with a flexible and user-friendly simulation interface.

3D Reconstruction

Artificial Intelligence in the Creative Industries: A Review

no code implementations24 Jul 2020 Nantheera Anantrasirichai, David Bull

We therefore conclude that, in the context of creative industries, maximum benefit from AI will be derived where its focus is human centric -- where it is designed to augment, rather than replace, human creativity.

BIG-bench Machine Learning Data Compression

Atmospheric turbulence removal using convolutional neural network

no code implementations22 Dec 2019 Jing Gao, N. Anantrasirichai, David Bull

This paper describes a novel deep learning-based method for mitigating the effects of atmospheric distortion.

A deep learning approach to detecting volcano deformation from satellite imagery using synthetic datasets

1 code implementation17 May 2019 Nantheera Anantrasirichai, Juliet Biggs, Fabien Albino, David Bull

As only a small proportion of volcanoes are deforming and atmospheric noise is ubiquitous, the use of machine learning for detecting volcanic unrest is more challenging.

BIG-bench Machine Learning

DefectNET: multi-class fault detection on highly-imbalanced datasets

1 code implementation1 Apr 2019 N. Anantrasirichai, David Bull

As a data-driven method, the performance of deep convolutional neural networks (CNN) relies heavily on training data.

Defect Detection Fault Detection +1

Atmospheric turbulence mitigation for sequences with moving objects using recursive image fusion

no code implementations10 Aug 2018 N. Anantrasirichai, Alin Achim, David Bull

This paper describes a new method for mitigating the effects of atmospheric distortion on observed sequences that include large moving objects.

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