| The tra11sInission of multimedia infOrmation ill the underwater acoustic channel inc1udes; voice,image and data transmission. lt takes important status in fields such as ocean environment, econolny,nlilitary affairs. It is also a subject to which so many researchers and scholars had devoted muchmdnpower and material resources. Tl1is paper introduced using wavelet's well specialty to processilnage information and changed zero t]ree lnetllod to complete compression. lt is an active attemptand discuss about information transmis5iiol1 in underwater acoustic channel.Basi11g on the practice require, zeIo tree lnethod l1as been changed. The software design, whichincludes wavelet transform and cl1anged zero tree method, is accomplisI1ed with TC. Then, DEBUGof 'I'I Company's CCS software is used to change TC progran1 to hardware program. WT620l board,wllose center cI1ip is Tl's Digital Signal Processor (DSP) TMS320C620l, is used to run tl1e program.ln sending port, video capture card of WlNNOV Company, Videum VO is used to get real time stillilnages and save them to hard disk as BMP fOrl11at files. Thel1, DSP is used to finish wavelettransformation and changed zero tree coding. In receive port, DSP is also used to finish waveIetreverse tral1slbnnation and cl1al1ged zero tree decodil1g, rebuilding the BMP image.'l'lle brief introduction of underwater acoustic channel and the cl1art of image transmissionsyste111, innovation of tI1is paper are given in the first chapter. Basic technology and hardware usingin this prOject are introduced in the seco11d chapteL Transform methods, especially the wavelettransformation are introdtlced il1 the tl1ird cllapter. II11age's coding methods are introduced in cl1apterfOur, witll tIlem tI1e zero tree method is the el11pl1ases. I11 cl1apter five, tI1ere are introductions ofsoftware al1d hardware program design, detail of chal1ged zero tree method. And, all the resuIts anddiscuss are give11 in chapter six. |
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