bmp.zip_bmp图像_bmp图像读取_imread_matlab读取bmp_图像读取 bmp

function readout=myBMPread %读取BMP图片 filterspec={ '*.bmp','BMP(*.bmp)'; }; [filename,filepath]=uigetfile(filterspec,'Select a file'); fullpath=[filepath filename] bmp=fopen(fullpath);%读入图像 if(bmp~=-1) fseek(bmp,28,-1); bitdepth=fread(bmp,1,'int') fseek(bmp,10,-1); %是图像从文件开始到图像数据间的偏移量 offset=fread(bmp,1,'int') status=fseek(bmp,18,-1); %图像宽度 imwidth=fread(bmp,1,'int') status=fseek(bmp,22,-1); %图像高度 imheight=fread(bmp,1,'int') end % 根据位深不同选择不同处理方式 if(bitdepth==8) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%读取灰度图像 readout=zeros(imheight,imwidth); readout=uint8(readout); fseek(bmp,offset,-1);%定位到图像数据开始区域 for i=1:imheight for j=1:imwidth position=offset+(i-1)*imheight+j; readout(imheight-i+1,j)=fread(bmp,1,'uint8'); %从最后一行开始存储 end end %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%以下为读入24位图像 elseif(bitdepth==24) r=zeros(imheight,imwidth); g=zeros(imheight,imwidth); b=zeros(imheight,imwidth); fseek(bmp,offset,-1);%偏移量为offset，开始读取数据存储区域 for i=1:imheight for j=1:imwidth R(imheight-i+1,j)=fread(bmp,1,'uint8'); G(imheight-i+1,j)=fread(bmp,1,'uint8'); B(imheight-i+1,j)=fread(bmp,1,'uint8'); end end for i=1:imheight for j=1:imwidth Color (i,j,1)=R(i,j); Color (i,j,2)=G(i,j); Color (i,j,3)=B(i,j); end end readout=uint8(Color); end fclose('all'); %关闭所有文件