Question

我发现通过imread函数导入大型multi-tiff文件对于我需要做的事情来说很慢。我使用googlefoo并找到tutorial来解释加载tif文件的更快方法。我试图使用代码（下面），但它一直在崩溃。正如教程所述，可能必须根据我尝试加载的内容更改代码，这就是我被困住的地方。我不太了解tifflib尝试更改代码。

是否有人能够帮助解释代码，以便我知道从哪里开始处理数据。

InfoImage=imfinfo('file.tif');
mImage=InfoImage(1).Width;
nImage=InfoImage(1).Height;
NumberImages=length(InfoImage);
FinalImage=zeros(nImage,mImage,NumberImages,'uint16');
FileID = tifflib('open',loaderpath,'r');
rps = tifflib('getField',FileID,Tiff.TagID.RowsPerStrip);

for i=1:NumberImages
   tifflib('setDirectory',FileID,i);
   % Go through each strip of data.
   rps = min(rps,nImage);
   for r = 1:nImage
      row_inds = r:min(nImage,r+rps-1);
      stripNum = tifflib('computeStrip',FileID,r);
      FinalImage(row_inds,:,i) = tifflib('readEncodedStrip',FileID,stripNum);
   end
end
tifflib('close',FileID);

Tiff文件格式

Filename                      'img_stack.tif'
FileModDate                   '25-Oct-2017 09:31:40'
FileSize                      49960190
Format                        'tif'
FormatVersion                 []    
Width                         1280
Height                        720
BitDepth                      8
ColorType                     'grayscale'
FormatSignature               [73,73,42,0]
ByteOrder                     'little-endian'
NewSubFileType                0
BitsPerSample                 8
Compression                   'PackBits'
PhotometricInterpretation     'BlackIsZero'
StripOffsets                  1x66 double
SamplesPerPixel               1
RowsPerStrip                  11
StripByteCounts               1x66 double
XResolution                   72
YResolution                   72
ResolutionUnit                'Inch'
Colormap                      []
PlanarConfiguration           'Chunky'
TileWidth                     []
TileLength                    []
TileOffsets                   []
TileByteCounts                []
Orientation                   1
FillOrder                     1
GrayResponseUnit              0.0100000000000000
MaxSampleValue                255
MinSampleValue                0
Thresholding                  1
Offset                        19840

Matlab tifflib代码探索

0 个答案: