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annotate Sphinx/source/plugins/python/pil-conversions.py @ 1113:a588960a72e5 default tip

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author Alain Mazy <am@orthanc.team>
date Mon, 28 Oct 2024 09:23:08 +0100
parents 1316bc62b5d5
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c62539d00251 Conversions between Orthanc and Python images
Sebastien Jodogne <s.jodogne@gmail.com>
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1 import json
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2 import PIL.Image
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3 import PIL.ImageDraw
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4 import orthanc
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5
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6 URL = 'https://orthanc.uclouvain.be/hg/orthanc-tests/raw-file/Orthanc-1.11.0/Database/LenaTwiceWithFragments.dcm'
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7 USERNAME = ''
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8 PASSWORD = ''
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10 def OnChange(changeType, level, resource):
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11 if changeType == orthanc.ChangeType.ORTHANC_STARTED:
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13 # (1) Download a sample DICOM instance and decode it
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14 orthanc.LogWarning('Downloading: %s' % URL)
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15 lena = orthanc.HttpGet(URL, USERNAME, PASSWORD)
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17 dicom = orthanc.CreateDicomInstance(lena)
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18 orthanc.LogWarning('Number of frames: %d' % dicom.GetInstanceFramesCount())
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20 # (2) Access the first frame of the instance as a PIL image
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21 frame = dicom.GetInstanceDecodedFrame(0)
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22 size = (frame.GetImageWidth(), frame.GetImageHeight())
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23
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24 if frame.GetImagePixelFormat() == orthanc.PixelFormat.RGB24:
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25 mode = 'RGB'
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26 else:
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27 raise Exception('Unsupported pixel format')
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29 image = PIL.Image.frombuffer(mode, size, frame.GetImageBuffer(), 'raw', mode, 0, 1)
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31 # (3) Draw a red cross over the PIL image
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32 draw = PIL.ImageDraw.Draw(image)
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33 draw.line((0, 0) + image.size, fill=(255,0,0), width=10)
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34 draw.line((0, image.size[1], image.size[0], 0), fill=(255,0,0), width=10)
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35
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36 # (4) Convert back the modified PIL image to an Orthanc image
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37 buf = image.tobytes()
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38 a = orthanc.CreateImageFromBuffer(frame.GetImagePixelFormat(), image.size[0], image.size[1],
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39 len(buf) // image.size[1], buf)
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41 # (5) Create and upload a new DICOM instance with the modified frame
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42 tags = {
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43 'SOPClassUID' : '1.2.840.10008.5.1.4.1.1.1',
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44 'PatientID' : 'HELLO',
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45 'PatientName' : 'WORLD',
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46 }
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48 s = orthanc.CreateDicom(json.dumps(tags), a, orthanc.CreateDicomFlags.GENERATE_IDENTIFIERS)
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49 orthanc.RestApiPost('/instances', s)
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50 orthanc.LogWarning('Image successfully modified and uploaded!')
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51
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52 orthanc.RegisterOnChangeCallback(OnChange)