matlab中怎样将像素为512×512的图像压缩为128×128,JPEG图像压缩Matlab程序

blockbit_seq=[];zrl_seq=[];trt_seq=[];zerolen=0;zeronumber=0;%% 分块中只有第一个DC系数为0或不为0，AC系数全为0的情况if numel(e)==1blockACbit_seq=[];blockbit_seq=[blockDCbit_seq,eob_seq];blockbit_len=length(blockbit_seq);elsefor i=2:wif ( e(i)==0 & zeronumber<16)zeronumber=zeronumber+1;elseif (e(i)==0 & zeronumber==16);bit_seq=dec2bin(2041,11);%%zrl=1111 1111 001zeronumber=1;blockACbit_seq=[blockACbit_seq,bit_seq];elseif (e(i)~=0 & zeronumber==16)zrl_seq=dec2bin(2041,11);amplitude=e(i);trt_seq=ACHuffmanEncoding(0,amplitude);bit_seq=[zrl_seq,trt_seq];blockACbit_seq=[blockACbit_seq,bit_seq];zeronumber=0;elseif(e(i))zerolen=zeronumber;amplitude=e(i);zeronumber=0;bit_seq=ACHuffmanEncoding(zerolen,amplitude);blockACbit_seq=[blockACbit_seq,bit_seq];endendendblockbit_seq=[blockDCbit_seq,blockACbit_seq,eob_seq];blockbit_len=length(blockbit_seq);%% blockbit_seq为整个块的编码序列，blockbit_len为整个块的编码长度blockbit_seq;blockbit_len;ImageBitSeq=[ImageBitSeq,blockbit_seq];ImageBitLen=numel(ImageBitSeq);colloop=colloop+1;endrowloop=rowloop+1;end%% 整个图像编码后的bit序列ImageBitSeq以及bit序列的长度ImageBitLenImageBitSeq;ImageBitLen;CompressionRatio=Row*Col*8/ImageBitLen;disp(‘DCTJPEG压缩编码比特率(bpp)’)AverageBit=ImageBitLen/Row/Col%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%************************* Encoding is finished ********************************%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Huffman解码程序省略%% 反量化：把矩阵CoefAfterQDecode反量化得矩阵CoefInverseQCoefInverseQ=blkproc(CoefAfterQ,[8,8],’x.*P1′,L);%% 反dct2变换：把CoefInverseQ分成8*8像素块，分别进行反dct2变换重建图像ImageSubRecon，并显示ImageSubRecon=blkproc(CoefInverseQ,[8,8],’idct2(x)’);ReconImage=round(ImageSubRecon)+128;%%向靠近的整数取圆整，反向电平平移128% figure,imshow(ReconImage,[]);%%title(‘DCTJPEG压缩重建图像’);%% 求峰值信噪比PSNR：disp(‘DCTJPEG压缩前后图像峰值信噪比(dB)’)PSNR0=PSNR(OriginalImage,ReconImage)

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