视频传输的错误隐藏技术研究计算机应用技术专业论文.docxVIP

R e R e s e a r c h o n E r r o r - C o n c e a lm e n t T e c h n i q u e s o f V i d e o T r a n s m is s i o n A b s t r a c t [A B S T R A C T ] T h e v isio n is the m o st im p ortant so urce o f hu m an access to in form atio n w h ile th e v id eo ho lds an im p o r tant p o sition o f th e m u ltim ed ia . H o w ev er, th ere are m any p ro b lem s in th e v ideo s sto rag e an d tran sm ission , for exam p le, low netw ork band w idth , tak ing up too large sp ace, n etw ork error lo ss. W ithout chang in g the ex istin g h ard w are cond itio n, the red uction o f th e red un d ancy an d u sing th e fau lt to leran ce are th e k ey to so lv e th e pro b lem . H .2 64 /A V C is the latest g eneration o f v id eo co d ing stand ard jo intly deve lo p ed by IT U -T and IS O / IE C . C o m p ared w ith the p rev io u s stan d ard, it can sav e 50 % o f b it rate w ith sim ilar v isu al qu ality , due to usin g sm a ller b lo ck m o d e, m u lti-fram e reference, F M O and other techn o lo g ies. O n th e o th er sid e, b ecause o f the sig n al instab ility an d other reaso ns, there are erro rs o r packet loss in th e tran sm issio n p rocess o f the com p ressed v id eo stream . E rror con cealm ent (E C ) can repair d am ag ed v ideo seq u en ce b ased on th e ex istin g in form atio n . F ram e s in H .2 6 4 /A V C can b e d iv id ed in to in tra-c o d ed f ram e s I, S I an d in ter-c o d e d f ram e s P , S P B , and S B . In th is thesis, fo r P -fram e w e fou n d th at th e p erform ances of o rig inal b o u nd ary m atch ing algorith m (B M A ) and the L ag ran ge interp o latio n (L I) error concealm ent effect are n ot satisfactory . S o w e pro p o se a n ew m eth o d . A d d ition ally, the pro po sed m ethod can be easily exten d ed to o th er in te r-c o d e d fra m e s . T h e em erg ence o f 3D v ideo bring s the erro r con cealm ent tech n ique great ch allen g es. O n th