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comparison Sphinx/source/plugins/python/pil-conversions.py @ 706:c62539d00251

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Conversions between Orthanc and Python images
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 11 Jun 2021 12:42:39 +0200
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children 8a247c645ac6
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705:745d93684b0b 706:c62539d00251
1 import json
2 import PIL.Image
3 import PIL.ImageDraw
4 import orthanc
5
6 URL = 'http://hg.orthanc-server.com/orthanc-tests/raw-file/Orthanc-1.9.3/Database/LenaTwiceWithFragments.dcm'
7 USERNAME = ''
8 PASSWORD = ''
9
10 def OnChange(changeType, level, resource):
11 if changeType == orthanc.ChangeType.ORTHANC_STARTED:
12
13 # (1) Download a sample DICOM instance and decode it
14 orthanc.LogWarning('Downloading: %s' % URL)
15 lena = orthanc.HttpGet(URL, USERNAME, PASSWORD)
16
17 dicom = orthanc.CreateDicomInstance(lena)
18 orthanc.LogWarning('Number of frames: %d' % dicom.GetInstanceFramesCount())
19
20 # (2) Access the first frame of the instance as a PIL image
21 frame = dicom.GetInstanceDecodedFrame(0)
22 size = (frame.GetImageWidth(), frame.GetImageHeight())
23
24 if frame.GetImagePixelFormat() == orthanc.PixelFormat.RGB24:
25 mode = 'RGB'
26 else:
27 raise Exception('Unsupported pixel format')
28
29 image = PIL.Image.frombuffer(mode, size, frame.GetImageBuffer(), 'raw', mode, 0, 1)
30
31 # (3) Draw a red cross over the PIL image
32 draw = PIL.ImageDraw.Draw(image)
33 draw.line((0, 0) + image.size, fill=(255,0,0), width=10)
34 draw.line((0, image.size[1], image.size[0], 0), fill=(255,0,0), width=10)
35
36 # (4) Convert back the modified PIL image to an Orthanc image
37 buf = image.tobytes()
38 a = orthanc.CreateImageFromBuffer(frame.GetImagePixelFormat(), image.size[0], image.size[1],
39 len(buf) / image.size[1], buf)
40
41 # (5) Create and upload a new DICOM instance with the modified frame
42 tags = {
43 'SOPClassUID' : '1.2.840.10008.5.1.4.1.1.1',
44 'PatientID' : 'HELLO',
45 'PatientName' : 'WORLD',
46 }
47
48 s = orthanc.CreateDicom(json.dumps(tags), a, orthanc.CreateDicomFlags.GENERATE_IDENTIFIERS)
49 orthanc.RestApiPost('/instances', s)
50 orthanc.LogWarning('Image successfully modified and uploaded!')
51
52 orthanc.RegisterOnChangeCallback(OnChange)