btcblock.m

BTC的基本方法

 function outbuf=btcblock(inbuf,size)
 temp=0;
 q=0;
 temp0=0;
 temp1=0;
 for m=1:size
     for n=1:size
        temp=temp+double(inbuf(m,n));
     end;
 end;
 xt=round(temp/(size*size)); 
 for m=1:size
    for n=1:size
        if (inbuf(m,n)>=xt)
            q=q+1;
            temp1=temp1+double(inbuf(m,n));
        else  
          temp0=temp0+double(inbuf(m,n));
        end; 
    end;
 end;
 
 if q~=size*size
     a0=round(temp0/(size*size-q));
 end;
 if q~=0
     a1=round(temp1/q);
 end;
  for m=1:size
    for n=1:size
      if(inbuf(m,n)<xt)
          outbuf(m,n)=a0;
      else
          outbuf(m,n)=a1;
      end;
    end;
  end;