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Dr Chathura Galkandage


Research Fellow
+44 (0)1483 684708
09 BB 01

My publications

Publications

Udora Carl C., Mir Junaid, Galkandage Chatura, Fernando Anil (2019) QoE Modelling of High Dynamic Range Video, Proceedings of the 2019 IEEE International Conference on Consumer Electronics (ICCE) pp. 1-2 Institute of Electrical and Electronics Engineers (IEEE)
The level of user satisfaction has no standard way of measuring for HDR video content due to the proven difficulty of building HDR quality assessment metrics. To overcome this limitation, Quality of Experience (QoE) modelling of HDR video has been proposed to find a robust and accurate HDR video QoE metric. The proposed model is the first attempt towards assessing and devising a non-reference quality metric for HDR video. It is based on finding the correlation between the HDR video features and the subjective test results. The proposed model achieves a significant correlation score of 0.724 with the subjective results.
Galkandage Chathura Vindana Perera, Calic Janko, Dogan Safak, Guillemaut Jean-Yves (2020) Full-Reference Stereoscopic Video Quality Assessment Using a Motion Sensitive HVS Model, IEEE Transactions on Circuits and Systems for Video Technology Institute of Electrical and Electronics Engineers
Stereoscopic video quality assessment has become
a major research topic in recent years. Existing stereoscopic video quality metrics are predominantly based on stereoscopic image quality metrics extended to the time domain via for example temporal pooling. These approaches do not explicitly consider the motion sensitivity of the Human Visual System (HVS). To address this limitation, this paper introduces a novel HVS model inspired by physiological findings characterising the
motion sensitive response of complex cells in the primary visual cortex (V1 area). The proposed HVS model generalises previous HVS models, which characterised the behaviour of simple and complex cells but ignored motion sensitivity, by estimating optical flow to measure scene velocity at different scales and orientations.
The local motion characteristics (direction and amplitude) are used to modulate the output of complex cells. The model is applied to develop a new type of full-reference stereoscopic video quality metrics which uniquely combine non-motion sensitive and motion sensitive energy terms to mimic the response of the HVS. A tailored two-stage multi-variate stepwise regression algorithm is introduced to determine the optimal contribution of
each energy term. The two proposed stereoscopic video quality metrics are evaluated on three stereoscopic video datasets. Results indicate that they achieve average correlations with subjective
scores of 0.9257 (PLCC), 0.9338 and 0.9120 (SRCC), 0.8622
and 0.8306 (KRCC), and outperform previous stereoscopic video
quality metrics including other recent HVS-based metrics.