function?varargout?=?Arith06（xC）
%?Arith06?????Arithmetic?encoder?or?decoder?
%?Vectors?of?integers?are?arithmetic?encoded?
%?these?vectors?are?collected?in?a?cell?array?xC.
%?If?first?argument?is?a?cell?array?the?function?do?encoding
%?else?decoding?is?done.
%
%?[y?Res]?=?Arith06（xC）;????????????????????%?encoding
%?y?=?Arith06（xC）;???????????????????????????%?encoding
%?xC?=?Arith06（y）;???????????????????????????%?decoding
%?------------------------------------------------------------------
%?Arguments:
%??y????????a?column?vector?of?non-negative?integers?（bytes）?representing?
%???????????the?code?0?<=?y（i）?<=?255.?
%??Res??????a?matrix?that?sum?up?the?results?size?is?（NumOfX+1）x4
%???????????one?line?for?each?of?the?input?sequences?the?columns?are
%???????????Res（:1）?-?number?of?elements?in?the?sequence
%???????????Res（:2）?-?unused?（=0）?
%???????????Res（:3）?-?bits?needed?to?code?the?sequence
%???????????Res（:4）?-?bit?rate?for?the?sequence?Res（:3）/Res（:1）
%???????????Then?the?last?line?is?total?（which?include?bits?needed?to?store?NumOfX）
%??xC???????a?cell?array?of?column?vectors?of?integers?representing?the
%???????????symbol?sequences.?（should?not?be?to?large?integers）
%???????????If?only?one?sequence?is?to?be?coded?we?must?make?the?cell?array
%???????????like:?xC=cell（21）;?xC{1}=x;?%?where?x?is?the?sequence
%?------------------------------------------------------------------
%?Note:?this?routine?is?extremely?slow?since?it?is?all?Matlab?code
%?This?function?do?recursive?encoding?like?Huff06.
%?An?alternative?（a?perhaps?better）?aritmethic?coder?is?Arith07
%?which?is?a?more?“pure“?arithmetic?coder

%?SOME?NOTES?ON?THE?FUNCTION
%?The?descrition?of?the?encoding?algorithm?is?in?
%?chapter?5?of?“The?Data?Compression?Book“?by?Mark?Nelson.?
%?The?actual?coding?algorithm?is?practical?identical?it?is?a?translation
%?from?C?code?to?MatLab?code?but?some?differences?have?been?made.
%?The?system?model?T?keep?record?of?the?symbols?that?have?been?encoded.?
%?based?on?this?table?the?probabiltity?of?each?symbol?is?estimated.?Probability?
%?for?symbol?m?is:?（T（m+1）-T（m+2））/T（1）
%?The?symbols?are?01...M?and?Escape?（M+1）?Escape?is?used?to?indicate?an?
%?unused?symbol?which?is?then?coded?by?another?table?the?Tu?table.
%?POSSIBLE?IMPROVEMENTS
%?-?better?decision?wether?to?split?a?sequence?or?not?
%?-?for?long?sequences?update?frequency?table?T=floor（T*a）??（ex:?0.2?%???and?do?this?for?every?La?samples?（ex:?100?%???We?must?not?set?any?non-zero?probabilities?to?zero?during?this?adaption!!
%?-?Display?some?information?（so?users?know?something?is?happening）

%----------------------------------------------------------------------
%?Copyright?（c）?1999-2001.??Karl?Skretting.??All?rights?reserved.
%?Hogskolen?in?Stavanger?（Stavanger?University）?Signal?Processing?Group
%?Mail:??karl.skretting@tn.his.no???Homepage:??http://www.ux.his.no/~karlsk/
%?
%?HISTORY:
%?Ver.?1.0??1

?屬性????????????大小?????日期????時間???名稱
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????I.A....?????19115??2012-09-22?10:43??matlab?算術編碼及解碼的實現\Arith06.m

????I.A....?????30008??2012-09-22?10:43??matlab?算術編碼及解碼的實現\Arith07.m

?????目錄??????????0??2012-09-22?10:45??matlab?算術編碼及解碼的實現

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