cmp_mrk.m

用matlab实现的JPEG算法

%-----d閒inition en global des marqueurs
%		de	JPEG2000 
% nom cmp_mrk
%----------------------------------------

function jmp = cmp_mrk(fid,marker) ;

marker_SOC = hex2dec('FF4F') ;
marker_SOT = hex2dec('FF90') ;
marker_SOS = hex2dec('FFDA') ;
marker_EOI = hex2dec('FFD9') ;
marker_SIZ = hex2dec('FF51') ;
marker_COD = hex2dec('FF52') ;
marker_COC = hex2dec('FF53') ;
marker_RGN = hex2dec('FF5E') ;
marker_QCD = hex2dec('FF5C') ;
marker_QCC = hex2dec('FF5D') ;
marker_POT = hex2dec('FF5F') ;
marker_ERS = hex2dec('FF59') ;
marker_PLT = hex2dec('FF58') ;
marker_PLM = hex2dec('FF59') ;
marker_PPM = hex2dec('FF60') ;
marker_PPT = hex2dec('FF61') ;
marker_SOP = hex2dec('FF91') ;
marker_CME = hex2dec('FF64') ;

val_mrk = marker_EOI ;

switch upper(marker)
case 'SIZ'
   val_mrk = marker_SIZ ; 
case 'SOT'
   val_mrk = marker_SOT ; 
case 'SOS'
   val_mrk = marker_SOS ;   
case 'EOI'
   val_mrk = marker_EOI ;   
case 'COD'
   val_mrk = marker_COD ;
case 'COC'
   val_mrk = marker_COC ;
case 'RGN'
   val_mrk = marker_RGN ;
case 'QCD'
   val_mrk = marker_QCD ;   
case 'QCC'
   val_mrk = marker_QCC ;
case 'ERS'
   val_mrk = marker_ERS ;   
case 'PLT'
   val_mrk =marker_PLT  ;
case 'PLM'
   val_mrk =marker_PLM  ;
case 'PPM'
   val_mrk =marker_PPM  ;
case 'PPT'
   val_mrk =marker_PPT  ;
case 'SOP'
   val_mrk =marker_SOP  ;
case 'CME'
   val_mrk =marker_CME  ;   
end





jmp=0 ;
[val,count]=fread(fid,1,'uint16');
if val==val_mrk
   jmp = fread(fid,1,'uint16')  ;
else
   fseek(fid,-2,'cof');
end