Research interests Signal compression using wavelet functions Lossy image compression Mammography image compression using variable quality compression General very low bitrate image compression Distortion limiting Reliable quality measures in medical imaging Near lossless image compression Lossless image compression using integer-based wavelet transforms Computerized tomography image compression in 3D Lossy and lossless video compression Entropy coding Publications Joonas Lehtinen, Coding of Wavelet-Transformed Images, TUCS Dissertations, No 62, June 2005 Kivijärvi J. and Lehtinen J. and Nevalainen O., Clustering by a parallel self-adaptive genetic algorithm, Proceedings of the 4th Asia-Pacific Conference on Simulated Evolution and Learning (SEAL'02), Singapore, November 18-22, 2002. [abstract] Lehtinen J., Kivijärvi J., Clustering context properties of wavelet coefficients in automatic modelling and image coding, Proceedings of IEEE 11th International Conference on Image Analysis and Processing, September 26 - 28, 2001, Palermo, Italy. [abstract][full paper] Lehtinen J., Predictive depth coding of wavelet transformed images, Proceedings of SPIE 1999, Vol. 3813. [full paper] Lehtinen J., Distortion Limited Wavelet Image Codec, Acta Cybernetica, Vol 14, No 2, 1999 (sent 1998). [abstract][full paper] Lehtinen J., Mammografiakuvien tiivistyksestä vqSPIHT algoritmilla, 1998, MSc. thesis, University of Turku. [abstract: pdf, html], [thesis pdf (dlwic section missing), zipped html (dlwic section missing,many figures broken)]. Järvi A., Lehtinen J., Nevalainen O., Variable Quality Image Compression System Based on SPIHT, 1999 (sent 1997), Signal Processing: Image Communications, 14(1999) 683-696. [abstract][full paper] Programs GNU Wavelet Image Codec (GWIC) - a general image compression algorithm based on DLWIC. TUCS, 1998.

GWIC