About Us

Department of Computer Science
(Rooms 7405 and 7406)
The Graduate Center
City University of New York
365 5th Avenue
New York, NY 10016

Phone: (212) 817-8193 (Gabor T. Herman)
                     817-8212, 13 & 14 (Room 7405)
                     817-8217 & 18 (Room 7406)
Fax: (212) 817-1510 (in the Dept. of Computer Sciencce)

Research areas of interest

Projects pursued in the DIG Group cover all aspects (from mathematical foundations, to algorithm development, to computer implementation and to applications to real problems) of image analysis and visualization. Recently published examples are:

Nikazad, T., Davidi, R., Herman, G.T.: Accelerated perturbation-resilient block-iterative projection methods with application to image reconstruction, Inverse Problems 28:035005, 2012

Herman, G.T., Kong, T.Y., Oliviera, L.: Tree representation of digital picture embeddings, Journal of Visual Communication and Image Representation 23:883-891, 2012

Herman, G.T., Garduño, E., Davidi, R., Censor, Y.: Superiorization: An optimization heuristic for medical physics, Medical Physics 9:5532-5546, 2012

Klukowska, J., Davidi, R., Herman, G.T.: SNARK09 - A software package for the reconstruction of 2D images from 1D projections, Computer Methods and Programs in Biomedicine, 110:424-440, 2013

Censor, Y., Davidi, R., Herman, G.T., Schulte, R.W., Tetruashvili, L.: Projected subgradient minimization versus superiorization, Journal of Optimization Theory and Applications, DOI:10.1007/s10957-013-0408-32013, 2013

Garduño, E., Herman, G.T.: Superiorization of the ML-EM algorithm, IEEE Transactions on Nuclear Science, 61:162-172, 2014

Herman, G.T., Frank, J. (editors): Computational Methods for Three-Dimensional Microscopy Reconstruction, Birkhäuser Basel, 2014

Katz, G., Benkarroum, Y., Wei, H., Rice, W.J., Bucher, D., Alimova, A., Katz, A., Klukowska, J., Herman, G.T., Gottlieb, P.: Morphology of influenza B/Lee/40 determined by cryo-electron microscopy, PLoS ONE, 9(2): e88288. doi:10.1371/journal.pone.0088288, 2014

Schrapp, M.J., Herman, G.T.: Data fusion in X-ray computed tomography using a superiorization approach, Review of Scientific Instruments 85:053701, 2014

Klukowska, J., Herman, G.T., Oton, J., Marabini, R., Carazo, J.-M.: The soft x-ray transform, Inverse Problems 30:125015, 2014

Herman, G.T.: Basis functions in image reconstruction from projections - A tutorial introduction, Sensing and Imaging, 16:6, 2015

Nature of the activities

The core group of computer scientists who at any given time are resident in the DIG Group has an ongoing world-wide collaboration with researchers of similar interests. For example, the coauthors of the papers listed above are from other universities in New York (such as Columbia), from California (such as Stanford) and from Iran, Israel and Mexico. The disciplines represented by them include biology, mathematics, physics and radiation therapy. Thus the students getting their PhD's within the DIG Group often end up working at those institutions and in those disciplines.

The DIG group is thoroughly involved with the educational activities of the PhD Program in Computer Science, both in the formal course structure and by informal weekly meetings devoted to some topic of common interest. PhD graduates from the group found employment at universities such as Harvard and Stanford. The group has been organizing many scientific meetings related to digital imaging and graphics. It has been continuously supported by grants both from the National Institutes of Health and from the National Science Foundation; the latest of which is on the topic of Computational Methods for Inverting the Soft X-Ray Transform and it supports regular exchange visits between members of the DIG Group and members of the Biocomputing Unit of the National Center of Biotechnology in Madrid, Spain.

Images from DIG Group activities

figure6c figure6d figure6e after_the_party_is_over
A component tree aids the visualization of proteins in a reconstructed molecule. Relaxing after a workshop.

dig logo
Discrete Imaging and Graphics Group.