The full text of this article/chapter:
Advanced DSP based system for image transmission over GSM/GPRS networks
by Jože Mohorko, Dušan Gleich, Peter Planinšiè
12th International Workshop on Systems, Signals and Image Processing (IWSSIP), Vol. 1, No. 1, 2005
Abstract: In this article the development of the prototype of complex hierarchical organized sensor/control system that enables the capture and transmission of high quality images through mobile networks is described. Compression methods (codecs) for image information contents are used for effective image transfer through bandwidth limited communication channel. JPEG method is one of the implemented methods. It is the most known standard method on the field of lossy methods, but it gives poor results at high compression rations. The best compression methods are based on Wavelet transformation. In our implementation lifting scheme for a 9/7-filter bank was used to compute wavelet transform and the novel coding process and ordering of bit plane bits is presented which is comparable with a JPEG2000 codec in rate-distortion sense and has lower computational complexity as JPEG2000. A trade-off between a complexity and efficiency has been made to meet the cannel capacity of the GSM/GPRS network. Coder prototype is realized in compact DSP video module with relatively low computational power. Usability of the described methods is demonstrated on Internet based application ‘Information system for image data collecting and distribution.
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