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Outputs (54)

Reevaluating Reconstruction Filters for Path-Searching Tasks in 3D (2016)
Journal Article
Roberts, D., & Ivrissimtzis, I. (2017). Reevaluating Reconstruction Filters for Path-Searching Tasks in 3D. Computer Graphics Forum, 36(6), 291-302. https://doi.org/10.1111/cgf.12939

In this paper, we present an experiment on stereoscopic direct volume rendering, aiming at understanding the relationship between the choice of reconstruction filter and participant performance on tasks requiring spatial understanding such as 3D path... Read More about Reevaluating Reconstruction Filters for Path-Searching Tasks in 3D.

Resilience of Luminance based Liveness Tests under Attacks with Processed Imposter Images (2016)
Presentation / Conference Contribution
Omar, L., & Ivrissimtzis, I. (2023, May). Resilience of Luminance based Liveness Tests under Attacks with Processed Imposter Images. Presented at 24th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision 2016 (WSCG 2016)., Plzen, Czech Republic

Liveness tests are techniques employed by face recognition authentication systems, aiming at verifying that a live face rather than a photo is standing in front of the system camera. In this paper, we study the resilience of a standard liveness test... Read More about Resilience of Luminance based Liveness Tests under Attacks with Processed Imposter Images.

A 3D Steganalytic Algorithm and Steganalysis-Resistant Watermarking (2016)
Journal Article
Yang, Y., Pintus, R., Rushmeier, H., & Ivrissimtzis, I. (2017). A 3D Steganalytic Algorithm and Steganalysis-Resistant Watermarking. IEEE Transactions on Visualization and Computer Graphics, 23(2), 1002-2626. https://doi.org/10.1109/tvcg.2016.2525771

We propose a simple yet efficient steganalytic algorithm for watermarks embedded by two state-of-the-art 3D watermarking algorithms by Cho et al. The main observation is that while in a clean model the means/variances of Cho et al.’s normalized histo... Read More about A 3D Steganalytic Algorithm and Steganalysis-Resistant Watermarking.

Quality measures of reconstruction filters for stereoscopic volume rendering (2016)
Journal Article
Roberts, D. A., & Ivrissimtzis, I. (2016). Quality measures of reconstruction filters for stereoscopic volume rendering. Computational Visual Media, 2(1), 19-30. https://doi.org/10.1007/s41095-016-0035-7

In direct volume rendering (DVR), the choice of reconstruction filter can have a significant effect on the visual appearance of the images produced and thus, on the perceived quality of a DVR rendered scene. This paper presents the results of a subje... Read More about Quality measures of reconstruction filters for stereoscopic volume rendering.

Evaluating the Resilience of Face Recognition Systems Against Malicious Attacks (2015)
Presentation / Conference Contribution
Omar, L., & Ivrissimtzis, I. (2015, September). Evaluating the Resilience of Face Recognition Systems Against Malicious Attacks. Presented at 7th UK Computer Vision Student Workshop (BMVW), Swansea, UK

This paper presents an experiment designed to test the resilience of several user verification systems based on face recognition technology against simple identity spoofing methods, such as trying to gain access to the system by using mobile camera s... Read More about Evaluating the Resilience of Face Recognition Systems Against Malicious Attacks.

Mesh Alignment using Grid based PCA (2015)
Presentation / Conference Contribution
Kaye, D., & Ivrissimtzis, I. (2015, March). Mesh Alignment using Grid based PCA. Presented at 10th International Conference on Computer Graphics Theory and Applications (VISIGRAPP 2015), Berlin, Germany

We present an algorithm for mesh alignment by performing Principal Components Analysis (PCA) on a set of nodes of a regular 3D grid. The use of a 3D lattice external to both inputs increases the robustness of PCA, particularly when dealing with meshe... Read More about Mesh Alignment using Grid based PCA.

A steganalytic algorithm for 3D polygonal meshes (2014)
Presentation / Conference Contribution
Yang, Y., Pintus, R., Rushmeier, H., & Ivrissimtzis, I. (2014, October). A steganalytic algorithm for 3D polygonal meshes. Presented at 2014 IEEE International Conference on Image Processing (ICIP), Paris, France

We propose a steganalytic algorithm for watermarks embedded by Cho et al.'s mean-based algorithm [1]. The main observation is that while in a clean model the means of Cho et al.'s normalized histogram bins are expected to follow a Gaussian distributi... Read More about A steganalytic algorithm for 3D polygonal meshes.

An evaluation of reconstruction filters for a path-searching task in 3D (2014)
Presentation / Conference Contribution
Roberts, D., Ivrissimtzis, I., & Holliman, N. (2014, September). An evaluation of reconstruction filters for a path-searching task in 3D. Presented at 2014 Sixth International Workshop on Quality of Multimedia Experience (QoMEX), Singapore, Singapore

The choice of reconstruction filter used to interpolate between sample points when generating images from volumetric data sets can have an impact on image quality. There are a range of reconstruction filters as well as methods to determine the qualit... Read More about An evaluation of reconstruction filters for a path-searching task in 3D.

Mesh Discriminative Features for 3D Steganalysis (2014)
Journal Article
Yang, Y., & Ivrissimtzis, I. (2014). Mesh Discriminative Features for 3D Steganalysis. ACM Transactions on Multimedia Computing, Communications and Applications, 10(3), Article 27. https://doi.org/10.1145/2535555

We propose a steganalytic algorithm for triangle meshes, based on the supervised training of a classifier by discriminative feature vectors. After a normalization step, the triangle mesh is calibrated by one step of Laplacian smoothing and then a fea... Read More about Mesh Discriminative Features for 3D Steganalysis.