Staff profile

I am an Associate Professor and member of the VIViD Group at the Department of Computer Science at Durham University. My primary research interests lie in the field of computer graphics, in particular applied visual perception to rendering and display hardware, with a strong focus on near-eye displays and virtual reality. 

Before joining Durham in 2018, I was a post-doctoral researcher at Inria, France, team GraphDeco, and visiting scholar at UC Berkeley Vision Science, USA, working on near-eye, stereo displays. 

Google Scholar Profile

Current Teaching

L3 Virtual and Augmented Reality

L4 Advanced Computer Graphics & Visualisation

L3 & L4 Final Year Project Supervision

• Computer Graphics
• Displays
• Virtual Reality
• Visual Perception

Conference Paper

• An Inverted Pyramid Acceleration Structure Guiding Foveated Sphere Tracing for Implicit Surfaces in VR
  
  Polychronakis, A., Koulieris, G. A., & Mania, K. (in press). An Inverted Pyramid Acceleration Structure Guiding Foveated Sphere Tracing for Implicit Surfaces in VR. Presented at Eurographics Symposium on Rendering.
• Large-Scale Multi-Character Interaction Synthesis
  
  Chang, Z., Wang, H., Koulieris, G. A., & Shum, H. P. (2025). Large-Scale Multi-Character Interaction Synthesis. In Proceedings of the 2025 ACM SIGGRAPH (pp. 1-10). ACM. https://doi.org/10.1145/3721238.3730750
• A Virtual Reality System for the Assessment of Patients with Lower Limb Rotational Abnormalities
  
  Sibrina, D., Bethapudi, S., & Koulieris, G. A. (2023). A Virtual Reality System for the Assessment of Patients with Lower Limb Rotational Abnormalities. Presented at 2023 IEEE Conference on Virtual Reality and 3D User Interfaces Abstracts and Workshops (VRW), Shanghai, China. https://doi.org/10.1109/vrw58643.2023.00234
• 3D Reconstruction of Sculptures from Single Images via Unsupervised Domain Adaptation on Implicit Models
  
  Chang, Z., Koulieris, G. A., & Shum, H. P. (2022, November). 3D Reconstruction of Sculptures from Single Images via Unsupervised Domain Adaptation on Implicit Models. Presented at VRST ’22: 28th ACM Symposium on Virtual Reality Software and Technology, Japan. https://doi.org/10.1145/3562939.3565632
• RHapTor: Rendering Haptic Torques for Virtual Reality
  
  Roice, K., & Koulieris, G. A. (2022, July). RHapTor: Rendering Haptic Torques for Virtual Reality. Presented at SIGGRAPH ’22: Special Interest Group on Computer Graphics and Interactive Techniques Conference, Vancouver, Canada. https://doi.org/10.1145/3532719.3543248
• Emulating Foveated Path Tracing
  
  Polychronakis, A., Koulieris, G. A., & Mania, K. (2021). Emulating Foveated Path Tracing. In R. Boulic, L. Hoyet, K. Singh, & D. Rohmer (Eds.), MIG ’21: Proceedings of the 14th ACM SIGGRAPH Conference on Motion, Interaction and Games. ACM. https://doi.org/10.1145/3487983.3488295
• Front Camera Eye Tracking For Mobile VR
  
  Drakopoulos, P., Koulieris, G. A., & Mania, K. (2020, March 22). Front Camera Eye Tracking For Mobile VR. Presented at 2020 IEEE Conference on Virtual Reality and 3D User Interfaces Abstracts and Workshops (VRW).
• DiCE: dichoptic contrast enhancement for binocular displays
  
  Zhong, F., Koulieris, G. A., Drettakis, G., Banks, M. S., Chambe, M., Durand, F., & Mantiuk, R. (2019, July 28). DiCE: dichoptic contrast enhancement for binocular displays. Presented at ACM SIGGRAPH 2019 Posters on - SIGGRAPH ’19.
• Cutting-Edge VR/AR Display Technologies (Gaze-, Accommodation-, Motion-aware and HDR-enabled)
  
  Koulieris, G., Aksit, K., Richardt, C., & Mantiuk, R. (2018). Cutting-Edge VR/AR Display Technologies (Gaze-, Accommodation-, Motion-aware and HDR-enabled). In SIGGRAPH Asia 2018 Courses.. Association for Computing Machinery (ACM). https://doi.org/10.1145/3277644.3277771
• Cutting-Edge VR/AR Display Technologies (Gaze-, Accommodation-, Motion-aware and HDR-enabled)
  
  Koulieris, G., Akşit, K., Richardt, C., Mantiuk, R., & Mania, K. (2018, March 18). Cutting-Edge VR/AR Display Technologies (Gaze-, Accommodation-, Motion-aware and HDR-enabled). Presented at IEEE VR 2018: 25th IEEE Conference on Virtual Reality and 3D User Interfaces., Reutlingen, Germany.
• Applications of visual perception to virtual reality rendering
  
  Patney, A., Zannoli, M., Koulieris, G., Kim, J., Wetzstein, G., & Steinicke, F. (2017). Applications of visual perception to virtual reality rendering. In ACM SIGGRAPH 2017 Courses (SIGGRAPH ’17). (pp. 1-38). Association for Computing Machinery (ACM). https://doi.org/10.1145/3084873.3086551
• Focus-tunable and fixed lenses and stereoscopic 3D displays (Conference Presentation)
  
  Banks, M. S., Johnson, P., Kim, J., Koulieris, G. A., Drettakis, G., & Gordon, L. (2017). Focus-tunable and fixed lenses and stereoscopic 3D displays (Conference Presentation). In L. Chien (Ed.), Proceedings SPIE 10125, Emerging Liquid Crystal Technologies XII. SPIE. https://doi.org/10.1117/12.2257371
• Gaze Prediction using Machine Learning for Dynamic Stereo Manipulation in Games
  
  Koulieris, G., Drettakis, G., Cunningham, D., & Mania, K. (2016). Gaze Prediction using Machine Learning for Dynamic Stereo Manipulation in Games. In T. Höllerer, V. Interrante, A. Lécuyer, & E. Suma (Eds.), 2016 IEEE Virtual Reality Conference (VR) : Greenville, South Carolina, USA, 19-23 March 2016. Proceedings. (pp. 113-120). Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/vr.2016.7504694
• Binocular eye-tracking for the control of a 3D immersive multimedia user interface
  
  Sidorakis, N., Koulieris, G. A., & Mania, K. (2015). Binocular eye-tracking for the control of a 3D immersive multimedia user interface. In 2015 IEEE 1st Workshop on Everyday Virtual Reality (WEVR) : proceedings of a meeting held 23 March 2015, Arles, Camargue, Provence, France. (pp. 15-18). Institute of Electrical and Electronics Engineers. https://doi.org/10.1109/wevr.2015.7151689
• High level saliency prediction for smart game balancing
  
  Koulieris, G. A., Drettakis, G., Cunningham, D., & Mania, K. (2014). High level saliency prediction for smart game balancing. In ACM SIGGRAPH 2014 Talks (SIGGRAPH ’14).. Association for Computing Machinery (ACM). https://doi.org/10.1145/2614106.2614157
• Context-aware material selective rendering for mobile graphics
  
  Koulieris, G. A., Drettakis, G., Cunningham, D., Sidorakis, N., & Mania, K. (2014). Context-aware material selective rendering for mobile graphics. In ACM SIGGRAPH 2014 Posters (SIGGRAPH ’14).. Association for Computing Machinery (ACM). https://doi.org/10.1145/2614217.2614246
• Attention-aware rendering, mobile graphics and games
  
  McNamara, A., Mania, K., Koulieris, G. A., & Itti, L. (2014). Attention-aware rendering, mobile graphics and games. In ACM SIGGRAPH 2014 Courses (SIGGRAPH ’14).. Association for Computing Machinery (ACM). https://doi.org/10.1145/2614028.2615416
• Gender differences in spatial awareness in immersive virtual environments: a preliminary investigation
  
  Paraskeva, C., Koulieris, G. A., Coxon, M., & Mania, K. (2012). Gender differences in spatial awareness in immersive virtual environments: a preliminary investigation. In Proceedings of the 11th ACM SIGGRAPH International Conference on Virtual-Reality Continuum and its Applications in Industry - VRCAI ’12 : Nanyang Technical University, Singapore, December 02-04, 2012. (pp. 95-98). Association for Computing Machinery (ACM). https://doi.org/10.1145/2407516.2407546

Doctoral Thesis

• Context-aware Gaze Prediction applied to Game Level Design, Level-of-Detail and Stereo Manipulation
  
  Koulieris, G. A. (2015). Context-aware Gaze Prediction applied to Game Level Design, Level-of-Detail and Stereo Manipulation [Thesis]. Technical University of Crete, Department of Electronic and Computer Enginneering.

Journal Article

• On the Design Fundamentals of Diffusion Models: A Survey
  
  Chang, Z., Koulieris, G. A., Chang, H. J., & Shum, H. P. H. (2026). On the Design Fundamentals of Diffusion Models: A Survey. Pattern Recognition, 169, Article 111934. https://doi.org/10.1016/j.patcog.2025.111934
• Effect of manipulating the vergence/accommodation and image size mismatches of the ±2D flipper test on the frequency and precision of accommodative facility
  
  Vera, J., Redondo, B., Martínez‐Tovar, J. M., Molina, R., Koulieris, G. A., Allen, P. M., & Jiménez, R. (2023). Effect of manipulating the vergence/accommodation and image size mismatches of the ±2D flipper test on the frequency and precision of accommodative facility. Ophthalmic and Physiological Optics, 43(4), 660-667. https://doi.org/10.1111/opo.13136
• Effect of wearing different types of face masks during dynamic and isometric resistance training on intraocular pressure
  
  Vera, J., Redondo, B., Koulieris, G., Jiménez, R., & García-Ramos, A. (2023). Effect of wearing different types of face masks during dynamic and isometric resistance training on intraocular pressure. Clinical and Experimental Optometry, 106(5), 503-508. https://doi.org/10.1080/08164622.2022.2054315
• The Statistics of Eye Movements and Binocular Disparities during VR Gaming: Implications for Headset Design
  
  Aizenman, A., Koulieris, G., Gibaldi, A., Sehgal, V., Levi, D., & Banks, M. S. (2023). The Statistics of Eye Movements and Binocular Disparities during VR Gaming: Implications for Headset Design. ACM Transactions on Graphics, 42(1), Article 7. https://doi.org/10.1145/3549529
• Dynamics of the accommodative response and facility with dual-focus soft contact lenses for myopia control
  
  Vera, J., Redondo, B., Galan, T., Machado, P., Molina, R., Koulieris, G., & Jiménez, R. (2023). Dynamics of the accommodative response and facility with dual-focus soft contact lenses for myopia control. Contact Lens and Anterior Eye, 46(1), Article 101526. https://doi.org/10.1016/j.clae.2021.101526
• OrthopedVR: clinical assessment and pre-operative planning of paediatric patients with lower limb rotational abnormalities in virtual reality
  
  Sibrina, D., Bethapudi, S., & Koulieris, G. A. (2023). OrthopedVR: clinical assessment and pre-operative planning of paediatric patients with lower limb rotational abnormalities in virtual reality. Visual Computer, 39, 3621–3633. https://doi.org/10.1007/s00371-023-02949-0
• Examining the Validity of a New Method for the Objective Assessment of Binocular Accommodative Facility (2Q-AF Test): A Comparison with ± 2.00 DS Lens Flippers
  
  Vera, J., Redondo, B., Koulieris, G., Molina, R., & Jiménez, R. (2022). Examining the Validity of a New Method for the Objective Assessment of Binocular Accommodative Facility (2Q-AF Test): A Comparison with ± 2.00 DS Lens Flippers. Current Eye Research, 47(1), 62-68. https://doi.org/10.1080/02713683.2021.1962359
• Short-term effects of caffeine intake on binocular accommodative facility: a quantitative and qualitative analysis
  
  Redondo, B., Vera, J., Koulieris, G., Molina-Romero, R., & Jiménez, R. (2022). Short-term effects of caffeine intake on binocular accommodative facility: a quantitative and qualitative analysis. Clinical and Experimental Optometry, 105(5), 534-538. https://doi.org/10.1080/08164622.2021.1935218
• Eye Tracking Interaction on Unmodified Mobile VR Headsets Using the Selfie Camera
  
  Drakopoulos, P., Koulieris, G., & Mania, K. (2021). Eye Tracking Interaction on Unmodified Mobile VR Headsets Using the Selfie Camera. ACM Transactions on Applied Perception, 18(3), Article 11. https://doi.org/10.1145/3456875
• The intraocular pressure response to lower-body and upper-body isometric exercises is affected by the breathing pattern
  
  Vera, J., Redondo, B., Perez-Castilla, A., Koulieris, G., Jiménez, R., & Garcia-Ramos, A. (2021). The intraocular pressure response to lower-body and upper-body isometric exercises is affected by the breathing pattern. European Journal of Sport Science, 21(6), 879-886. https://doi.org/10.1080/17461391.2020.1790670
• Intraocular Pressure Responses to Four Different Isometric Exercises in Men and Women
  
  Vera, J., Redondo, B., Koulieris, G., Torrejon, A., Jiménez, R., & Garcia-Ramos, A. (2020). Intraocular Pressure Responses to Four Different Isometric Exercises in Men and Women. Optometry and Vision Science, 97(8), 648-653. https://doi.org/10.1097/opx.0000000000001545
• Validation of an Objective Method for the Qualitative and Quantitative Assessment of Binocular Accommodative Facility
  
  Vera, J., Redondo, B., Molina, R., Koulieris, G., & Jiménez, R. (2020). Validation of an Objective Method for the Qualitative and Quantitative Assessment of Binocular Accommodative Facility. Current Eye Research, 45(5), 636-644. https://doi.org/10.1080/02713683.2019.1688837
• DiCE: Dichoptic Contrast Enhancement for VR and Stereo Displays
  
  Zhong, F., Koulieris, G., Drettakis, G., Banks, M. S., Chambe, M., Durand, F., & Mantiuk, R. (2019). DiCE: Dichoptic Contrast Enhancement for VR and Stereo Displays. ACM Transactions on Graphics, 38(6), Article 211. https://doi.org/10.1145/3355089.3356552
• Acute intraocular pressure changes during isometric exercise and recovery: The influence of exercise type and intensity, and participant´s sex
  
  Vera, J., Raimundo, J., García-Durán, B., Pérez-Castilla, A., Redondo, B., Delgado, G., Koulieris, G., & García-Ramos, A. (2019). Acute intraocular pressure changes during isometric exercise and recovery: The influence of exercise type and intensity, and participant´s sex. Journal of Sports Sciences, 37(19), 2213-2219. https://doi.org/10.1080/02640414.2019.1626072
• Near‐Eye Display and Tracking Technologies for Virtual and Augmented Reality
  
  Koulieris, G., Aksit, K., Stengel, M., Mantiuk, R., Mania, K., & Richardt, C. (2019). Near‐Eye Display and Tracking Technologies for Virtual and Augmented Reality. Computer Graphics Forum, 38(2), 493-519. https://doi.org/10.1111/cgf.13654
• Investigating the Immediate and Cumulative Effects of Isometric Squat Exercise for Different Weight Loads on Intraocular Pressure: A Pilot Study
  
  Vera, J., Jiménez, R., Redondo, B., Torrejón, A., Koulieris, G. A., Gustavo de Moraes, C., & García-Ramos, A. (2019). Investigating the Immediate and Cumulative Effects of Isometric Squat Exercise for Different Weight Loads on Intraocular Pressure: A Pilot Study. Sports Health, 11(3), 247-253. https://doi.org/10.1177/1941738119834985
• Accommodation and comfort in head-mounted displays
  
  Koulieris, G., Bui, B., Banks, M. S., & Drettakis, G. (2017). Accommodation and comfort in head-mounted displays. ACM Transactions on Graphics, 36(4), Article 87. https://doi.org/10.1145/3072959.3073622
• An Automated High-Level Saliency Predictor for Smart Game Balancing
  
  Koulieris, G. A., Drettakis, G., Cunningham, D., & Mania, K. (2015). An Automated High-Level Saliency Predictor for Smart Game Balancing. ACM Transactions on Applied Perception, 11(4), Article 17. https://doi.org/10.1145/2637479
• C-LOD: Context-aware Material Level-of-Detail applied to Mobile Graphics
  
  Koulieris, G. A., Drettakis, G., Cunningham, D., & Mania, K. (2014). C-LOD: Context-aware Material Level-of-Detail applied to Mobile Graphics. Computer Graphics Forum, 33(4), 41-49. https://doi.org/10.1111/cgf.12411

Presentation

• Fitting Room: Lung Transplantation Donor-Recipient Size-matching in Virtual Reality
  
  Sibrina, D., Novysedlak, R., Kolarik, J., Lischke, R., & Koulieris, G. A. (2024, July 25). Fitting Room: Lung Transplantation Donor-Recipient Size-matching in Virtual Reality [Poster]. Presented at SIGGRAPH ’24: Special Interest Group on Computer Graphics and Interactive Techniques Conference, Denver CO USA. https://doi.org/10.1145/3641234.3671048