İsmail Avcıbaş

Address

Electronics Engineering Department

Uludağ University

Bursa, Turkey

Phone: +90 (224) 442 8179-(1112)

Fax: +90 (224) 442 8020

avcibas@uludag.edu.tr

 

Education

Ph.D. Electrical-Electronics Engineering, Boğaziçi University, 2001

M.S. Electronics Engineering, Uludağ University, 1994

B.Sc. Electronics Engineering, Uludağ University, 1992

 

Teaching

Undergraduate

Signals and Systems II

Digital Image Processing

Signal Processing Applications

Multimedia Systems

 

Graduate

Data Compression

Random Signal Analysis

 

Research Interests:

Data Compression, Image Processing, Multimedia Communication and Security, Digital Forensics, Steganography and Steganalysis, Pattern Recognition.

 

Multimedia Forensics

In the analog world, media content like photographs and tape recordings have generally been accepted as a "proof of occurrence" of the depicted event. In today's digital age, the creation and manipulation of multimedia content is made simple by digital processing tools that are easily and widely available. As a consequence, we can no longer take the authenticity of multimedia content, analog or digital, for granted especially when it comes to legal evidence. Media forensics, in this context, is concerned with determining some underlying fact about multimedia content. For example, given an image on may ask questions such as:

  • Is this image an "original" image or was it created by cut and paste operations from different images?
  • Was this image captured by a camera manufactured by vendor X or vendor Y?
  • Did this image originate from camera X as claimed? At time Y? At location Z?
  • Does this image truly represent the original scene or was it digitally tampered to deceive the viewer? For example, was this coffee stain actually a blood stain that was re-colored?
  • Was this image manipulated to embed a secret message? That is, is this image a stego-image or a cover image?

 

Similar questions can be asked about audio and video. The above questions are just a few instances of issues faced quite routinely by investigation and law enforcement agencies. However, there is a severe lack of techniques that could help them in finding authoritative answers. Although digital watermarks have been proposed as a tool to provide authenticity to multimedia, it is a fact that the overwhelming majority of content that is captured today does not contain a digital watermark. And this situation is likely to continue for the foreseeable future. Hence in the absence of widespread adoption of digital watermarks, the goal is to develop techniques that can help us make statements about the origin, veracity and nature of multimedia content.

 

Projects Involved:

  • “Digital Image Forensics”, TÜBİTAK KARİYER, 104E056, PI, 2004-2009.

 

Steganography and Steganalysis

The development of techniques for audio and image steganography, the practice of hiding a secret message within an innocuous cover medium, and the wide-spread availability of tools for it have led to an increased interest in steganalysis techniques for image and audio data. In this project we pioneered universal steganalysis techniques for audio and image data. Our approach is based on the hypothesis that hiding a secret message in audio or image data leaves definite artifacts that can be detected using statistical analysis. We have built a package which extracts a number of statistical features from a set of supplied cover and stego images and then build a classifier, which is then used to distinguish supplied images

as either being clean or stego.

 

Projects Involved:

  • “US-Turkey Cooperative Research: Steganalysis Techniques for Images and Audio”, NSF Award 0218074, Co-PI, 2002-2005.
  • “Steganalysis Based on Image and Audio Quality Metrics”, AFRL, 2002-2004.
  • “Steganalysis of Digital Watermarking Techniques”, AFOSR, 2001-2003.

 

Professional Experience

2002- ..., Assistant Professor, Electronics Engineering Department, Uludağ University, Bursa, Turkey

2001- 2002, Lecturer, Electronics Engineering Department, Uludağ University, Bursa, Turkey

1997-2001, PhD student, Electrical-Electronics Engineering Department, Boğaziçi University, Bursa, Turkey

1999-2000, Research Fellow, Computer and Information Sciences, Polytechnic University, Brooklyn, NY, USA.

1999-1999, Research Fellow, Electrical Engineering, University of Nebraska at Lincoln, NB, USA.

1998-1999, Lecturer, Electronics Engineering Department, Uludağ University, Bursa, Turkey

1993-1997, Research Assistant, Electronics Engineering Department, Uludağ University, Bursa, Turkey

 

Awards

TOFAŞ 1991 – 92, undergraduate fellowship

TOFAŞ 1992 – 93, M.S fellowship

TÜBİTAK 1997-99, Integrated PhD fellowship

NSF 2000-2000, 6 months, research fellowship, awarded by project No: 9996097

 

Publications

 

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Journal Publications

 

  • Özer H., B. Sankur, N. Memon, İ. Avcıbaş, “Detection of Audio Covert Channels Using Statistical Footprints of Hidden Messages”, Digital Signal Processing, (in press), (2006). (pdf)

 

  • Avcıbaş, İ., “Audio Steganalysis With Content Independent Distortion Measures,” IEEE Signal Processing Letters, 13, 92-95, (2006). (pdf)

 

  • Avcıbaş, İ., M. Kharrazi, N. Memon, B. Sankur, “Image Steganalysis With Binary Similarity Measures,” EURASIP Journal on Applied Signal Processing, 17, 2749-2757, (2005). (pdf)

 

  • Avcıbaş, İ., N. Memon, B. Sankur, K. Sayood, “A Succesively Refinable Lossless Image Coding Algorithm,” IEEE Transactions on Communications, 53, 445-452, (2005). (pdf)

 

  • Avcıbaş, İ., N. Memon, B. Sankur, “Steganalysis Using Image Quality Metrics,” IEEE Transactions on Image Processing, 12, 221-229, (2003). (pdf)

 

  • Avcıbaş, İ., N. Memon, B. Sankur, K. Sayood, “A Progressive Lossless/Near-Lossless Image Compression Algorithm,” IEEE Signal Processing Letters, 9, 312-314, (2002). (pdf)

 

  • Avcıbaş İ., B. Sankur, K. Sayood, “Statistical Evaluation of Image Quality Measures,” Journal of Electronic Imaging, 11, 206-223, (2002). (pdf)

 

Conference Publications

  • Çeliktutan O., İ. Avcıbaş, B. Sankur, N. Memon, “Source Cell-phone Identification,” 13th International Conference on Advanced Computing & Communication,Tamil Nadu, 2005. (pdf)

 

  • Bayram, S., H.T. Sencar, N. Memon, İ. Avcibas, “Source Camera Identification Based on CFA Interpolation,” IEEE International Conference on Image Processing, Vol. III, 69 – 72, Genova, 2005. (pdf)

 

  • Bayram S., İ. Avcıbaş, B. Sankur, N. Memon, “Image Manipulation Detection with Binary Similarity Measures,” 13th European Signal Processing Conference, Vol. I, 752-755, Antalya, 2005.

 

  • Koçal O. H., E. Yürüklü, İ. Avcıbaş, “Speech Steganalysis using Chaotic-type Features,” 13th European Signal Processing Conference, Vol. 2, 826-829, Antalya, 2005.

 

  • Avcıbaş İ., S. Bayram, N. Memon, B. Sankur, M. Ramkumar, “A Classifier Design For Detecting Image Manipulations,” IEEE International Conference on Image Processing, Vol. IV, 2645 - 2648, Singapore, 2004. (pdf)

 

  • Avcıbaş İ., N. Memon, B. Sankur, “Image steganalysis with binary similarity measures,” IEEE International Conference on Image Processing, Vol. III, 645 – 648, Rochester, 2002. (pdf)

 

  • Avcıbaş İ., N. Memon, B. Sankur, K. Sayood, “Lossless and Near-Lossless Compression with Successive Refinement,” in B. Girod, C. A. Bouman, E. G. Steinbach (Eds.), Visual Communications and Image Processing, Proc. SPIE Vol. 4310, pp. 41-52, San Jose, 2001. (pdf)

 

  • Avcıbaş İ., N. Memon, B. Sankur, “Staganalysis of Watermarking Techniques Using Image Quality Metrics,” in Ping Wah Wong; Edward J. Delp; (Eds.) Security and Watermarking of Multimedia Contents III, Proc. SPIE Vol. 4314, p. 523-531, San Jose, 2001. (pdf)

 

  • Sankur B., N. Memon, İ. Avcıbaş, “Automatic Detection of the Presence of Stegosignals and Watermarks in Images,” European Conference on Visual Perception, pp. 38, Antalya, 2001. (pdf)

 

  • Avcıbaş İ., N. Memon, B. Sankur, “Steganalysis Based On Image Quality Metrics,” IEEE 4th Workshop on Multimedia Signal Processing, pp. 517-522, Cannes, 2001. (pdf)

 

  • Avcıbaş İ., B. Sankur, K. Sayood, N. Memon, “Component Ratio Preserving Compression for Remote Sensing Applications,” in B. Vasudev, T. R. Hsing, A. G. Tescher, R. L. Stevenson (Eds.), Image and Video Communications and Processing, Proc. SPIE, Vol. 3974, pp. 700-708, San Jose, 2000.

 

  • Avcıbaş İ., B. Sankur, “Statistical Analysis of Image Quality Measures,” 10th European Signal Processing Conference, pp. 2181-2184, Tampere, 2000.

 

  • Avcıbaş İ., B. Sankur, K. Sayood, “New Distortion Measures for Color Image Vector Quantization”, ISAS'98: World Multiconference on Systemics, Cybernetics and Informatics II, pp. 496-503, Orlando, 1998.

 

Conference Publications in Turkish

  • Çeliktutan O., İ. Avcıbaş, B. Sankur, N. P. Ayerden, Ç. Çapar, “İmgeden Cep Telefonu Tanılama”, IEEE Sinyal İşleme ve Uygulamaları Kurultayı, Antalya, 2006.

 

  • Gül G., A. E. Dirik, İ. Avcıbaş, “Değiştirilmiş Nicemleme Yönteminin Gizliyazı Analizi”, IEEE Sinyal İşleme ve Uygulamaları Kurultayı, Antalya, 2006.

 

  • Bayram S., İ. Avcıbaş, “İkili Doku ve Benzerlik Ölçütleri İle Parmakizi Sınıflandırma,” IEEE Sinyal İşleme ve Uygulamaları Kurultayı, 231-233, İstanbul, 2003.

 

  • Özer H., B. Sankur, İ. Avcıbaş, “Ses işaretlerinde saklı veri sezimi,” IEEE Sinyal İşleme ve Uygulamaları Kurultayı, 513-516, Pamukkale, 2003.

 

  • Gücüyener İ., İ. Avcıbaş, O. Süle, “Yeni Bir Fiber Optik Titreşim Duyargacı Tasarımı Ve Alınan İşaretlerle CNC Freze Kesici Ucu Aşınmasının İzlenmesi,” IEEE Sinyal İşleme ve Uygulamaları Kurultayı,784-788, Pamukkale, 2002.

 

  • Avcıbaş İ., Y. Yiğit, Ö. Kahya, “Ses Gizliyazı Analizi,” IEEE Sinyal İşleme ve Uygulamaları Kurultayı, 1319-1323, Pamukkale, 2002.

 

  • Avcıbaş İ., B. Sankur, “İkili Benzerlik Ölçütleri ile İmge Gizliyazı Analizi,” IEEE Sinyal İşleme ve Uygulamaları Kurultayı, 697-702, Pamukkale, 2002.

 

  • Avcıbaş İ., B. Sankur, N. Memon, “İmge Nitelik Ölçütlerine Dayanarak Damgalama Sezimi,” IEEE Sinyal İşleme ve Uygulamaları Kurultayı, 26-31, Lefkoşa, 2001.

 

  • Avcıbaş İ., B. Sankur, N. Memon, “Yitimsiz ve Sınırlı -Yitimli Kodlamada Bağlam Olasılıklarının Kullanımı,” IEEE Sinyal İşleme ve Uygulamaları Kurultayı, 267-272, Lefkoşa, 2001.

 

  • Avcıbaş İ., B. Sankur, “Çokbantli imgelerde nitelik ölçülerinin istatistiksel davranışı,” IEEE Sinyal İşleme ve Uygulamaları Kurultayı, 114-119, Ankara, 1999.

 

  • Avcıbaş İ., B.Sankur, “Kodlama Algoritmalarinin Bilgi Içerigini Koruma Basarimlari,” 6. Sinyal Isleme ve Uygulamalari Kurultayi, 248-253, Ankara, 1998.

 

  • Demir D., İ. Avcıbaş, H. Gümüşkaya, E. Dilaveroğlu, “Nesneye Yönelik Bilgisayarla Görü Ortamı (MAMGÖR) ,” 3. Sinyal İşleme ve Uygulamaları Kurultayı, 216-221, Nevşehir, 1995.

 

  • Avcıbaş İ., H. Gümüşkaya, D. Demir, B. Sankur, E. Anarım, “Nesneye Yönelik Alt Düzeyde Bilgisayarla Görme Ortamı,” 2. Sinyal İşleme ve Uygulamaları Kurultayı, 59-64, Gökova, 1994.

 

Member

IEEE

 

Professional Service

Reviewer for

IEEE Transactions on Image Processing,

IEEE Transactions on Multimedia,

Image and Vision Computing,

Signal Processing.

Panelist for TÜBİTAK research projects.