• Anchored kernel hashing for cancelable template protection for cross-spectral periocular data 

      Bylappa Raja, Kiran; Ramachandra, Raghavendra; Busch, Christoph (Journal article; Peer reviewed, 2019)
      Periocular characteristics is gaining prominence in biometric systems and surveillance systems that operate either in NIR spectrum or visible spectrum. While the ocular information can be well utilized, there exists a ...
    • Automated Authentication of Audiovisual Contents: A Biometric Approach 

      Khodabakhsh, Ali (Doctoral theses at NTNU;2021:213, Doctoral thesis, 2021)
      Following the introduction of image manipulation tools such as Adobe Photoshop in the early 2000s, the public trust in image authenticity dropped and the need for the development and deployment of image authentication ...
    • Benchmarking Binarisation Schemes for Deep Face Templates 

      Drozdowski, Pawel; Struck, Florian; Rathgeb, Christian; Busch, Christoph (Chapter, 2018)
      Feature vectors extracted from biometric characteristics are often represented using floating point values. It is, however, more appealing to store and compare feature vectors in a binary representation, since it generally ...
    • Collecting fingerprints for recognition using mobile phone cameras 

      Yang, Bian; Li, Xue; Busch, Christoph (Journal article; Peer reviewed, 2012)
      We present in this paper a sample quality control approach for the case using a mobile phone’s camera as a fingerprint sensor for fingerprint recognition. Our approach directly estimates the maximum ridge frequency ...
    • Computational Workload in Biometric Identification Systems: An Overview 

      Drozdowski, Pawel; Rathgeb, Christian; Busch, Christoph (Journal article; Peer reviewed, 2019)
      Computational workload is one of the key challenges in biometric identification systems. The na{\"i}ve retrieval method based on an exhaustive search becomes impractical with the growth of the number of the enrolled data ...
    • Cross-lingual Speaker Verification: Evaluation On X-Vector Method 

      Mandalapu, Hareesh; Møller Elbo, Thomas; Ramachandra, Raghavendra; Busch, Christoph (Chapter, 2021)
      Automatic Speaker Verification (ASV) systems accuracy is based on the spoken language used in training and enrolling speakers. Language dependency makes voice-based security systems less robust and generalizable to a wide ...
    • Database Binning and Retrieval in Multi-Fingerprint Identification Systems 

      Drozdowski, Pawel; Fischer, Daniel; Rathgeb, Christian; Schiel, Christopher; Busch, Christoph (Chapter, 2018)
      The increasingly large scale of deployed biometric systems necessitates approaches for computational workload reduction in order to perform identification queries efficiently. Simple database binning based on classification ...
    • Deep Learning for Fingerprint Recognition Systems 

      Schuch, Patrick (Doctoral theses at NTNU;2019:242, Doctoral thesis, 2019)
      Summary Biometric recognition is a typical means to identify individuals or to verify claimed identities. Use cases are manifold. For example, users can unlock their smartphones for convenience by presenting their faces ...
    • Deep Learning Techniques for Face Image Quality Estimation 

      Thorsen, Tommy (Master thesis, 2018)
      Biometric authentication using fingerprints or face recognition is becoming mainstream, and there is a need to make these methods as secure and reliable as possible. One way to achieve better performance with a biometric ...
    • Design and Development of Low-Cost Sensor to Capture Ventral and Dorsal Finger Vein for Biometric Authentication 

      Ramachandra, Raghavendra; Bylappa Raja, Kiran; Venkatesh, Sushma; Busch, Christoph (Peer reviewed; Journal article, 2019)
      Biometrics-based authentication of subjects is widely deployed in several real-life applications. Among various biometric characteristics, the finger-vein characteristic has demonstrated both reliable and highly accurate ...
    • Detection of Glasses in Near-Infrared Ocular Images 

      Drozdowski, Pawel; Struck, Florian; Rathgeb, Christian; Busch, Christoph (Chapter, 2018)
      Eyeglasses change the appearance and visual perception of facial images. Moreover, under objective metrics, glasses generally deteriorate the sample quality of near-infrared ocular images and as a consequence can worsen ...
    • FiPrAD - A Guideline for Fingerprint Presentation Attack Database Creation 

      Madhun, Ahmed S. M. (Bachelor thesis, 2018)
      Abstract: Nowadays, biometric recognition systems are widely implemented in many personal devices like smartphones and laptops, as it provides higher security while identifying the real owners of these devices. Fingerprint ...
    • A Generalizable Deepfake Detector based on Neural Conditional Distribution Modelling 

      Khodabakhsh, Ali; Busch, Christoph (Chapter, 2020)
      Photo- and video-realistic generation techniques have become a reality following the advent of deep neural networks. Consequently, there are immense concerns regarding the difficulty in differentiating what content is real ...
    • Improved ear verification after surgery - An approach based on collaborative representation of locally competitive features 

      Ramachandra, Raghavendra; Raja, Kiran; Venkatesh, Sushma Krupa; Busch, Christoph (Journal article; Peer reviewed, 2018)
      Ear characteristic is a promising biometric modality that has demonstrated good biometric performance. In this paper, we investigate a novel and challenging problem to verify a subject (or user) based on the ear characteristics ...
    • Innovative methods for large-scale fingerprint identification systems - Facilitating searching in a large-scale database 

      Li, Guoqiang (Doctoral theses at NTNU;296, Doctoral thesis, 2016)
      Fingerprint recognition has gained wide acceptance and great popularity after the fingerprint recognition based applications have been adopted in diverse scenarios, such as forensics area (mainly by law enforcement agencies), ...
    • Iris Recognition in Visible Wavelength: Impact and automated Detection of Glasses 

      Osorio-Roig, Daile; Drozdowski, Pawel; Rathgeb, Christian; Morales-González, Annette; Garea-Llano, Eduardo; Busch, Christoph (Chapter, 2018)
      The prevalence of visual impairment around the world is rapidly increasing, causing large numbers of people to wear glasses. Glasses are generally considered an important noise source in iris recognition; under objective ...
    • Multi-biometric Identification with Cascading Database Filtering 

      Drozdowski, Pawel; Mokroß, Benedikt-Alexander; Rathgeb, Christian; Busch, Christoph (Journal article, 2020)
      The growing scale and number of biometric deployments around the world necessitates research into technologies which facilitate fast identification queries and high discriminative power. In this context, this article ...
    • Multilingual Voice Impersonation Dataset and Evaluation 

      Mandalapu, Hareesh; Busch, Christoph; Ramachandra, Raghavendra (Chapter, 2021)
      Well-known vulnerabilities of voice-based biometrics are impersonation, replay attacks, artificial signals/speech synthesis, and voice conversion. Among these, voice impersonation is the obvious and simplest way of attack ...
    • On the Application of Homomorphic Encryption to Face Identification 

      Drozdowski, Pawel; Buchmann, Nicolas; Rathgeb, Christian; Margraf, Marian; Busch, Christoph (Chapter, 2019)
      The data security and privacy of enrolled subjects is a critical requirement expected from biometric systems. This paper addresses said topic in facial biometric identification. In order to fulfil the properties of ...
    • Performance Evaluation of Fusing Protected Fingerprint Minutiae Templates on the Decision Level 

      Yang, Bian; Busch, Christoph; Groot, Koen de; Xu, Haiyun; Veldhuis, Raymond N.J. (Journal article; Peer reviewed, 2012)
      In a biometric authentication system using protected templates, a pseudonymous identifier is the part of a protected template that can be directly compared. Each compared pair of pseudonymous identifiers results in a ...