P. Fränti and J. Kivijärvi, "Randomized local search algorithm for the clustering problem", Pattern Analysis and Applications, 3 (4), December 2000. (in press)
    T. Kaukoranta, P. Fränti and O. Nevalainen, "A fast exact GLA based on code vector activity detection", IEEE Transactions on Image Processing, 9 (8), 1337-1342, August 2000.
    P. Fränti, H.H. Gyllenberg, M. Gyllenberg, J. Kivijärvi, T. Koski, T. Lund and O. Nevalainen, "Minimizing stochastic complexity using local search and GLA and with applications to classification of bacteria", Biosystems, 57 (1), 37-48, June 2000.
    P. Fränti, T. Kaukoranta, D.-F. Shen and K.-S. Chang, "Fast and memory efficient implementation of the exact PNN", IEEE Transactions on Image Processing, 9 (5), 773-777, May 2000.
    P. Fränti, "Genetic algorithm with deterministic crossover for vector quantization", Pattern Recognition Letters, 21 (1), 61-68, 2000.
    T. Kaukoranta, P. Fränti and O. Nevalainen, "Vector quantization by lazy pairwise nearest neighbor method", Optical Engineering, 38 (11), 1862-1868, November 1999.
    J. Lehtinen, "Distortion limited wavelet image codec", Acta Cybernetica, 14 (2), 1999.
    A. Järvi, J. Lehtinen and O. Nevalainen, "Variable quality image compression system based on SPIHT", Signal Processing: Image Communication, 14, 683-696, 1999.
    P. Fränti and T. Kaukoranta, "Binary vector quantizer design using soft centroids", Signal Processing: Image Communication, 14, 677-681, 1999.
    J. Teuhola, "Fast image compression by quadtree prediction", Real-Time Imaging, 4 (4), 299-308, 1998.
    J. Kivijärvi, T. Ojala, T. Kaukoranta, A. Kuba, L. Nyúl and O. Nevalainen, "A comparison of lossless compression methods for medical images", Computerized Medical Imaging and Graphics, 22 (4), 323-339, October 1998.
    T.Kaukoranta, P. Fränti and O.Nevalainen, "Iterative split-and-merge algorithm for VQ codebook generation", Optical Engineering, 37 (10), 2726-2732, October 1998.
    P. Fränti, J. Kivijärvi and O. Nevalainen, "Tabu search algorithm for codebook generation in VQ", Pattern Recognition, 31 (8), 1139-1148, August 1998.
    P. Fränti, J. Kivijärvi, T. Kaukoranta and O. Nevalainen, "Genetic algorithms for large scale clustering problem", The Computer Journal, 40 (9), 547-554, 1997.
    P. Fränti, T. Kaukoranta and O. Nevalainen, "On the splitting method for VQ codebook generation", Optical Engineering, 36 (11), 3043-3051, November 1997.
    P. Fränti, T. Kaukoranta and O. Nevalainen, "On the design of a hierarchical BTC-VQ compression system", Signal Processing: Image Communication, 8 (6), 551-562, September 1996.
    T. Kaukoranta, P. Fränti and O. Nevalainen, "Reallocation of GLA codevectors for evading local minima", Electronics Letters, 32 (17), 1563-1564, August 1996.
    P. Fränti and O. Nevalainen, "Compression of binary images by composite methods based on the Block Coding", Journal of Visual Communication and Image Representation, 6 (4), 366-377, 1995.
    P. Fränti and O. Nevalainen, "Block truncation coding with entropy coding", IEEE Trans on Communications, 43 (2), 1677-1685, 1995.
    P. Fränti, O. Nevalainen and T. Kaukoranta, "Compression of digital images by Block Truncation Coding: A survey", The Computer Journal, 37 (4), 308-332, 1994.
    P. Fränti, "A fast and efficient compression method for binary images", Signal Processing: Image Communication, 6 (1), 69-76, 1994.
    P. Fränti and O. Nevalainen, "A two-stage modelling method for compressing binary images by arithmetic coding", The Computer Journal, 36 (7), 615-622, 1993.

    J. Kivijärvi, P. Fränti and O. Nevalainen, "Efficient clustering with a self-adaptive genetic algorithm", Proc. World Multiconference on Systemics, Cybernetics and Informatics (SCI2000), Orlando, Florida, USA, vol. III, 241-246, July 2000.
    J. Lehtinen, "Predictive depth coding of wavelet transformed images", Proc. SPIE vol. 3813, 1999.
    P. Fränti, "On the usefulness of self-organizing maps for the clustering problem in vector quantization", Proc. 11th Scandinavian Conference on Image Analysis (SCIA'99), Kangerlussuaq, Greenland, 415-422, 1999.
    P. Fränti and J. Kivijärvi, "Random swapping technique for improving clustering in unsupervised classification", Proc. 11th Scandinavian Conference on Image Analysis (SCIA'99), Kangerlussuaq, Greenland, 407-413, 1999.
    T. Kaukoranta, P. Fränti and O. Nevalainen, "Reduced comparison search for the exact GLA", Proc. Data Compression Conference - DCC'99, Snowbird, Utah, USA, 33-41, March 1999.
    P. Fränti and T. Kaukoranta, "Fast implementation of the optimal PNN method", Proc. International Conference on Image Processing, Chicago, Illinois, USA, October 1998.
    T. Kaukoranta, P. Fränti and O. Nevalainen, "A new iterative algorithm for VQ codebook generation", Proc. International Conference on Image Processing, Chicago, Illinois, USA, October 1998.
    T. Kaukoranta, P. Fränti and O. Nevalainen, "Fast and space efficient PNN algorithm with delayed distance calculations", Proc. GraphiCon'98: The 8th International Conference on Computer Graphics and Visualization, Moscow, Russia, September 1998.
    P. Fränti, J. Kivijärvi, T. Kaukoranta and O. Nevalainen, "Genetic algorithms for codebook generation in VQ", Proc. 3rd Nordic Workshop on Genetic Algorithms, Helsinki, Finland, 207-222, 1997.
    T. Kaukoranta, P. Fränti and O. Nevalainen, "Empirical study on subjective quality evaluation of compressed images", Proc. Very High Resolution and Quality Imaging, San Jose, CA, SPIE vol. 2663, 88-99, 1996.
    P. Fränti, T. Kaukoranta and O. Nevalainen, "Blockwise distortion measure in image compression", Proc. Very High Resolution and Quality Imaging, San Jose, CA, SPIE vol. 2663, 78-87, 1996.
    P. Fränti, T. Kaukoranta, O. Nevalainen, "A new approach to BTC-VQ image compression system", Proc. Picture Coding Symposium, Sacramento, CA, 162-165, 1994.

    O. Virmajoki, P. Fränti and T. Kaukoranta, "Practical methods for speeding-up the PNN method", University of Joensuu, Department of Computer Science, Technical Report, Series A, Report A-2000-2, 2000.
    J. Kivijärvi, P. Fränti and O. Nevalainen, "Self-adaptive genetic algorithm for clustering", Technical Report 308, TUCS - Turku Centre for Computer Science, Turku, Finland, 1999.
    P. Fränti and J. Kivijärvi, "Randomized local search algorithm for the clustering problem", Technical Report A-1999-5, Department of Computer Science, University of Joensuu, 1999.
    T. Kaukoranta, P. Fränti and O. Nevalainen, "Vector quantization by Lazy Pairwise Nearest Neighbor method", Technical Report 180, TUCS - Turku Centre for Computer Science, Turku, Finland, 1998.
    J. Kivijärvi, T. Ojala, T. Kaukoranta, A. Kuba, L. Nyúl and O. Nevalainen, "The comparison of lossless compression methods in the case of a medical image database", Technical Report 171, TUCS - Turku Centre for Computer Science, Turku, Finland, 1998.
    T. Kaukoranta, P. Fränti and O. Nevalainen, "Iterative split-and-merge algorithm for VQ codebook generation", Technical Report 154, TUCS - Turku Centre for Computer Science, Turku, Finland, 1997.
    P. Fränti, T. Kaukoranta and O. Nevalainen, "On the splitting method for VQ codebook generation", Algoritmipäivä, Report C-1997-11, Department of Computer Science, University of Helsinki, 1996.
    P. Fränti, J. Kivijärvi and O. Nevalainen, "Tabu search algorithm for codebook generation in vector quantization", Technical Report A-96-6, Department of Computer Science, University of Joensuu, 1996.
    P. Fränti, J. Kivijärvi, T. Kaukoranta and O. Nevalainen, "Genetic algorithms for codebook generation in VQ", Technical Report A-96-5, Department of Computer Science, University of Joensuu, 1996.
    T. Kaukoranta, P. Fränti and O. Nevalainen, "Reallocation of GLA codevectors for evading local minima", Technical Report 25, TUCS - Turku Centre for Computer Science, Turku, Finland, 1996.
    T. Kaukoranta, P. Fränti and O. Nevalainen, "Empirical study on subjective quality evaluation of compressed images", Research Report R-95-4, Computer Science, University of Turku, 1996.
    P. Fränti and T. Kaukoranta and O. Nevalainen, "Blockwise distortion measure in image compression", Research Report R-95-2, Computer Science, University of Turku, 1995.
    T. Kaukoranta, P. Fränti and O. Nevalainen, "Quality measures in image compression", Technical Report, Algoritmipäivä, Tampereen yliopisto, Tietojenkäsittelyopin laitos, 1995.
    P. Fränti, T. Kaukoranta and O. Nevalainen, "On the design of a hierarchical BTC-VQ compression system", Research Report R-94-6, Computer Science, University of Turku, 1994.
    P. Fränti and O. Nevalainen, "Block truncation coding with entropy coding", Research Report R-93-1, Computer Science, University of Turku, 1994.
 
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