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151
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1 -- https://groups.google.com/d/msg/orthanc-users/Rc-Beb42xc8/JUgdzrmCAgAJ
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2
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3 function OnStoredInstance(instanceId, tags, metadata, origin)
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4 -- Do not compress twice the same file
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5 if origin['RequestOrigin'] ~= 'Lua' then
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6
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7 -- Retrieve the incoming DICOM instance from Orthanc
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8 local dicom = RestApiGet('/instances/' .. instanceId .. '/file')
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9
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10 -- Write the DICOM content to some temporary file
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11 local uncompressed = '/tmp/uncompressed-' .. instanceId .. '.dcm'
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12 local target = assert(io.open(uncompressed, 'wb'))
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13 target:write(dicom)
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14 target:close()
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15
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16 -- Compress to JPEG2000 using gdcm
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17 local compressed = '/tmp/compressed-' .. instanceId .. '.dcm'
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18 os.execute('gdcmconv -U --j2k ' .. uncompressed .. ' ' .. compressed)
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19
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20 -- Generate a new SOPInstanceUID for the JPEG2000 file, as
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21 -- gdcmconv does not do this by itself
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22 os.execute('dcmodify --no-backup -m "SOPInstanceUID=' ..
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23 tags['SOPInstanceUID'] .. '" ' .. compressed)
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24
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25 local source = assert(io.open(compressed, 'rb'))
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26 local jpeg2k = source:read("*all")
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27 source:close()
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28
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29 -- Upload the JPEG2000 file and remove the uncompressed file
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30 RestApiDelete('/instances/' .. instanceId)
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31 RestApiPost('/instances', jpeg2k)
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32
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33 -- Remove the temporary DICOM files
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34 os.remove(uncompressed)
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35 os.remove(compressed)
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36 end
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37 end
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