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annotate Resources/Samples/Lua/AutomatedJpeg2kCompression.lua @ 1845:8ae1a18b9afb

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readme
author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 30 Nov 2015 14:04:05 +0100
parents 1c9e99d2bfd2
children e371519d4ac9
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1c9e99d2bfd2 AutomatedJpeg2kCompression.lua
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1 -- This sample shows how to use Orthanc to compress on-the-fly any
1c9e99d2bfd2 AutomatedJpeg2kCompression.lua
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2 -- incoming DICOM file, as a JPEG2k file.
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3
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4 function OnStoredInstance(instanceId, tags, metadata, origin)
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5 -- Do not compress twice the same file
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6 if origin['RequestOrigin'] ~= 'Lua' then
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7
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8 -- Retrieve the incoming DICOM instance from Orthanc
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9 local dicom = RestApiGet('/instances/' .. instanceId .. '/file')
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10
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11 -- Write the DICOM content to some temporary file
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12 local uncompressed = instanceId .. '-uncompressed.dcm'
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13 local target = assert(io.open(uncompressed, 'wb'))
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14 target:write(dicom)
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15 target:close()
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16
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17 -- Compress to JPEG2000 using gdcm
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18 local compressed = instanceId .. '-compressed.dcm'
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19 os.execute('gdcmconv --j2k ' .. uncompressed .. ' ' .. compressed)
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20
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21 -- Generate a new SOPInstanceUID for the JPEG2000 file, as
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22 -- gdcmconv does not do this by itself
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23 os.execute('dcmodify --no-backup -gin ' .. compressed)
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24
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25 -- Read the JPEG2000 file
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26 local source = assert(io.open(compressed, 'rb'))
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27 local jpeg2k = source:read("*all")
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28 source:close()
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29
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30 -- Upload the JPEG2000 file and remove the uncompressed file
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31 RestApiPost('/instances', jpeg2k)
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32 RestApiDelete('/instances/' .. instanceId)
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33
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34 -- Remove the temporary DICOM files
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35 os.remove(uncompressed)
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36 os.remove(compressed)
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37 end
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38 end