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1、clearallfprintf('Readingdata...')data=imread('cameraman.tif');data=uint8(data);%读入数据，并将数据限制为uint8fprintf('Done!')%编码压缩fprintf('compressingdata...');[zipped,info]=norm2huff(data);fprintf('Done!')%解压缩fprintf('compressingdata...');unzipped=huff2norm(zipped,i
2、nfo);fprintf('Done!')%测试是否无失真isOK=isequal(data(:),unzipped(:))%显示压缩效果whosdatazippedunzippedfunction[zipped,info]=norm2huff(vector)if~isa(vector,'uint8'),error('inputargumentmustbeauint8vector')endvector=vector(:)';%将输入向量转换为行向量f=frequency(vector);%计算个元素出现的概率
3、simbols=find(f~=0);f=f(simbols);%将元素按出现的概率排列[f,sortindex]=sot(f);simbols=simbols(sortindex);%产生码字generatethecodewordasthe52bitsofadoublelen=length(simbols);simbols_index=num2cell(1:len);codeword_tmp=cell(len,1);whilelength(f)>1,index1=simbols_index{1};index2=
4、simbols_index{2};codeword_tmp(index1)=addnode(codeword_tmp(index1),uint8(0));codeword_tmp(index2)=addnode(codeword_tmp(index2),uint8(1));f=[sum(f(1:2))f(3:end)];simbols_index=[{[index1index2]}simbols_index(3:end)];%将数据重新排列，是两个节点的频率尽量与前一个节点的频率想当resortdatainord
5、ertohavetwonodeswithlowerfrequencyasfirstto[f,sortindex]=sort(f);simbols_index=simbols_index(sortindex);end%对应相应的元素与码字codeword=cell(256:1);codeword(simbols)=codeword_tmp;%计算总的字符串长度len=0;forindex=1:length(vector),len=len+length(codeword{double(vector(index))+1
6、});end%产生01序列string=repmat(uint8(0),1,len);pointer=1;forindex=1:length(vector),code=codeword{double(vector(index))+1};len=length(code);string(pointer+(0:len-1))=code;pointer=pointer+len;end%如果需要，加零len=length(string);pad=8-mod(len,8);ifpad>0,string=[stringuint
7、8(zeros(1,pad))];end%保存实际有用的码字codeword=codeword(simbols);codelen=zeros(size(codeword));weights=2.^(0:23);maxcodelen=0;forindex1:length(codeword),len=length(codeword{index});iflen>maxcodelen,maxcodelen=len;endiflen>0,code=sum(weights(codeword{index}==1));code=
8、bitset(code,len+1);codeword{index}=code;codelen(index)=len;endendcodeword=[codeword{:}]%计算压缩后的向量cols=length(string)/8;string=reshape(string,8,cols);weights=2.^(0:7);zipped=uint8(weights*d
