University of Bristol

Comparing VVC, HEVC and AV1 using Objective and Subjective Assessments

Fan Zhang, Angeliki Katsenou, Mariana Afonso, Goce Dimitrov and David Bull ABSTRACT In this paper, the performance of three state-of-the-art video codecs: High Efficiency Video Coding (HEVC) Test Model (HM), AOMedia Video 1 (AV1) and…

Computational cameras

A novel close-to-sensor computational camera has been designed and developed at the ViLab. ROIs can be captured and processed at 1000fps; the concurrent processing enables low latency sensor control and flexible image processing. With 9DoF…

Terrain analysis for biped locomotion

Numerous scenarios exist where it is necessary or advantageous to classify surface material at a distance from a moving forward-facing camera. Examples include the use of image based sensors for assessing and predicting terrain type…

Mitigating the effects of atmospheric turbulence on surveillance imagery

Various types of atmospheric distortion can influence the visual quality of video signals during acquisition. Typical distortions include fog or haze which reduce contrast, and atmospheric turbulence due to temperature variations or aerosols. An effect…

High Frame Rate Video

As the demand for higher quality and more immersive video content increases, the need to extend the current video parameter space of spatial resolutions and display sizes, to include, among other things, a wider colour gamut, higher dynamic range…

What’s on TV: A Large-Scale Quantitative Characterisation of Modern Broadcast Video Content

What does one year of modern broadcast video look like? This project analyses the spatial and temporal diversity in contemporary video to make inferences about testing new video technologies.

Optimal presentation duration for video quality assessment

Does the length of a video sequence affect the reliability of a viewer’s quality assessment? With the aim of increasing data collection efficiency and reducing processing times, this project aims to identify how long video sequences should be in subjective video quality assessment studies.

Undecimated 2D Dual Tree Complex Wavelet Transforms

This work introduces two undecimated forms of the 2D Dual Tree Complex Wavelet Transform (DT-CWT) which combine the benefits of the Undecimated Discrete Wavelet Transform (exact translational invariance, a one-to-one relationship between all co-located coefficients at all scales) and the DT-CWT (improved directional selectivity and complex subbands).

Perceptual Quality Metrics (PVM)

Novel video quality metrics that use the dual-tree complex wavelet transform (DT-CWT) and motion analysis to characterise perceptual tolerances within spatial and temporal textures

Parametric Video Coding

A video compression scheme where an analysis/synthesis framework is employed rather than the conventional energy minimization approach.

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