ࡱ> !" ܥhc e?6v6vv<v<v<v<v<<<<<<<< <n>C<=======N>P>P>P>P>P>P>>X ?n>v<=====n>>v<v<=<>>>=v<=v<=N> Ż<<v<v<v<v<=N>>>>  PRIVATE MACROBUTTON HtmlDirect  PRIVATE width=124 height=26 SRC="telenor_s.gif" MACROBUTTON HtmlResImg INCLUDEPICTURE "C:/WINDOWS/TEMP/wia7a8/telenor_s.bmp" \* MERGEFORMAT    PRIVATE

MACROBUTTON HtmlDirect

H.263 Negotiable Options Unrestricted Motion Vector mode. In this mode motion vectors are allowed to point outside the picture. The edge pels are used as prediction for the "not existing" pels. With this mode a significant gain is achieved if there is movement along the edge of the pictures, especially for the smaller picture formats. Additionally, this mode includes an extension of the motion vector range so that larger motion vectors can be used. This is especially useful in case of camera movement. Advanced Prediction mode. This option means that overlapped block motion compensation is used for the P-frames. Four 8x8 vectors instead of one 16x16 vector are used for some of the macroblocks in the picture, and motion vectors are allowed to point outside the picture as in the UMV mode above. The encoder has to decide which type of vectors to use. Four vectors use more bits, but give better prediction. The use of this mode generally gives a considerable improvement, especially subjectively because OBMC results in less blocking artifacts. Syntax-based Arithmetic Coding mode. In this mode arithmetic coding is used instead of VLC coding. The SNR and reconstructed frames will be the same, but generally fewer bits will be produced. In Telenor's encoder, the average gain for inter frames is 3-4%. This gain depends on the sequence, the bitrate and other options used. For intra blocks and frames, the gain is higher, on average about 10%. PB-frames mode. A PB-frame consists of two pictures being coded as one unit. The name PB comes from the name of picture types in MPEG where there are P-pictures and B-pictures. Thus a PB-frame consists of one P-picture which is predicted from the last decoded P-picture and one B-picture which is predicted from both the last decoded P-picture and the P-picture currently being decoded. This last picture is called a B-picture, because parts of it may be bidirectionally predicted from the past and future P-pictures. For relatively simple sequences, the framerate can be doubled with this mode without increasing the bitrate much. For sequences with a lot of motion, PB-frames do not work as well as B-pictures in MPEG. This is because there are no separate bidirectional vectors in H.263, the forward vectors for the P-picture is scaled and added to a small delta-vector. The advantage over MPEG is much less overhead for the B-picture part, which is really useful for the low bitrates and relatively simple sequences most often generated by videophones. These options are negotiable. This means the decoder signals the encoder which of the options it has the capability to decode. If the encoder has any of these options, it can then turn them on, and for each of the options used the quality of the decoded video-sequence will increase.   PRIVATE href="h263_software/"MACROBUTTON HtmlResAnchor Telenor's H.263 software (both encoder and decoder) supports all the negotiable options. To learn more about the negotiable options you should read the   PRIVATE href="h263_wht/"MACROBUTTON HtmlResAnchor H.263 document.   PRIVATE

MACROBUTTON HtmlDirect

   PRIVATE HREF="/brukere/DVC/"MACROBUTTON HtmlResAnchor  PRIVATE width=45 height=30 src="telenor_b.gif" MACROBUTTON HtmlResImg INCLUDEPICTURE "C:/WINDOWS/TEMP/wia7a8/telenor_b.bmp" \* MERGEFORMAT  Back to Digital Video Coding home page.   PRIVATE MACROBUTTON HtmlDirect  Last modified: Tue Dec 12 07:35:23 1995  PRIVATE MACROBUTTON HtmlDirect    PRIVATE href="http://www.nta.no/brukere/kol/"MACROBUTTON HtmlResAnchor Karl Olav Lillevold   PRIVATE HREF="mailto:kol@nta.no"MACROBUTTON HtmlResAnchor  /= h        .........)()()^: D  n  | nC ||(| xx 88ر]m* ] !bDhptt//:wwwof.t.ueleronon.rb/eku/erCVDet/nel_rog.sfi\:CNIWWODT\Spmearo yrtnInre teliF\secac1ehet\nel_rog.sfiTTH1/P 0.002oD muctneof oll swIM -EMreVois :n0.1C tnotneyT-:epmi egaig/ fnoCnetL-tgne:ht59 9 IH!+/`!mH H `                                                                                                                                                                                                                              f :    - C --(-@@@`!A`!AB`!tBC`!%rC&`!a&I`! I`!  `!MH+0DHN0HR G G G G G G G G G G G G G G G G G G G G G G G G G G G G G GИʟݟݟܟݟݟܟݟޟ}˟ݟVRT}ݟ} ݟݟݟܟC}ݟݟݟݟ$%<FHIJz{&'?Cb&>Il <=Wop)78:;=>LMdhilmop:;C^buDC^b uD^b^bPUP%uDacP(C uDCuDQ;<>fgjkmn-./023bc}/uP(C uDCuD^b uD^buD<%abc*ABC&I jklhij/!!"!!M!E!!!!!<<<<<!<<<*K$`$Normal,Pdda c,`, Heading 1,H1 <Uc0k$*`* Heading 2,H2 <Uc$*`* Heading 3,H3 <Uc&`& Heading 4,H4 <U(`( Heading 5,H5<Uc(`( Heading 6,H6<Uc"A`"Default Paragraph Font o Address<<V&o& Blockquotehh<<oCITEVo!CODE]c:o2:Definition Compact,DL COMPACTh<<.oB.Definition List,DL0<<$oQ$Definition Term,DT]c oa Definition,DFNVc,o, Directory,DIRh@ o Emphasis,EMV6o6Horizontal Rule,HR&'()/o Hypertext,A^b o Keyboard,KBD]^cb0`bList Bullet,ULF  4hb1`bList Number,OLF  4h.XoXMenuF  4h\o\PRE WIDE@ N1%/  #&),]c^o^Preformatted,PRE:  -1%) ` @`! %(+]c"o" RestartList!o! Sample,SAMP]"o1"Strikethrough,STRIKEWoA Strong,STRONGU oQ Typewriter,TT]c oa Variable,VARV]c*o*z-Bottom of Form'&c o z-HTML Tag ]^bc(o( z-Top of Form)(c     ;/FG& o 7 : h l :<=fj-/33C333333C@3333   >Bartlomiej Winnowicz&C:\stach\H_263 Negotioable Options.htm@C CCCTimes New Roman Symbol &Arial5Courier New"A@h & FL !C:\MSOffice\Templates\HTML.DOTH.263 Negotioable OptionsEBartlomiej WinnowiczBartlomiej Winnowicz $,Root Entryff=z= F]? Ż Ż#zWordDocumentf=Dfk=e=if3==Cf?pCompObjzzzz3333kjpSummaryInformationff3333(pppdp E  FMicrosoft Word Document MSWordDocWord.Document.69qࡱOh+'0DX x   H.263 Negotioable Options@ (*Bartlomiej WinnowiczF HtmlDocumentSummaryInformationT SYRACU8,%r2q ,D +r <rr`FHF՜.+,0HPt|  NPAC, Syracuse UniversityH H.263 Negotioable OptionsǟFИBИݟИڟИ9ޟИDИƟИИǟИ۟PИݟИИUڟИޟǃИ۟ИИJИИPԟޟИИݟИޟИИJИLИUݟИYޟИИИȟWИИИʟИИEИMИИ۟ИИИNΟPИTڟИИEИИޟИИ6ӟИޟSȌИИИИڟИȟИИDݟHИGИИИEИИ̟SИڟИAИ͟ИИȟИԟИПИИCИLJ`3ИИDИHИUИИJИPИUИV3WИJИИИИUИИR֟ИИИDИٟИИAИDИGИИIğИȟИYИ֟ИEٟИ ɟUşޟИИ֟ИT۟ИИ֟ИИИޟИИҟUИИEܟИИИEИИИEкИИDИFИИGИHИTИJИS3VWUИUFИVИWИИИYDИИИИAИИИWHИИИИEИFИИAИDИFИGИM֟EИZ8И֟EИИИ5ИИИ֟EИИИDИŽXp3DИDИFИHИFИJИMMUИVИWИBИИИИɌИUИEИޟИИИИAИИBИGИUݟEИHИIBݟEИJИZ2ޟEИޟEИИ֟EИKٟEИѓÀИЊÀÀÀѓp3ИVW3ИDИИИDИFИHИJИUИVWИИИИИИUИEИEИИEܟИFИaЊЊЊE@ЊÀÀÀEИU3ڑLH@3ИDИFИHИИJИUИVWИ6ေИИИ3CИJИTИUИڱLڣEИИ۟EИߟEИИИИѓآ3ИИDИFИFИJИMXXPUИUИVИWИИИ2И3KИJИTИUИVИИ$ΟИИИ3ИDИFИHИJИUИVИWИИYИZИИИИИFИUИEИܟИИCИИ1PИ33ИßTИИDИHИUИVИИEИИEИИϐ/3FИJИDИHИSVИUИVИTڡИИEИTИИИИИ3ИDИFИGИH8ИJИSVИUИVИJИWYИИИPИEܟИИИDИИИHȟИИ3VИDИVИDИFИИJИVИWИUИFQИVWИИEܟИИИИEИܟИHИИDИFИHИJИSVWИUИVИJИWИИИИИИUИVИИLڱڱڡИAИEИFИИESEИXEИGϟИ0P0P0P0P0P0P0PИ<ۀ3уИD<ۀF3FИHZSVИUИVWИTИИИИИJИИUИИИSVWИEܟИИИ3UИDИFИИPдSV.dotce\Bartlomiej WinnowiczF2DMicrosoft Word for Windows 95@@Z Ż@ҭzŻL ࡱ> ՜.+,0HPt|  NPAC, Syracuse UniversityH H.263 Negotioable Options