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devel / comp.protocols.dicom / Re: Encoding of Traditional Chinese using ISO IR-100

SubjectAuthor
* Encoding of Traditional Chinese using ISO IR-100David Gobbi
`* Encoding of Traditional Chinese using ISO IR-100Sebastian Meyer
 `* Encoding of Traditional Chinese using ISO IR-100David Gobbi
  `* Encoding of Traditional Chinese using ISO IR-100David Gobbi
   `- Encoding of Traditional Chinese using ISO IR-100Sebastian Meyer

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Re: Encoding of Traditional Chinese using ISO IR-100

<2d896a5f-c483-4438-9151-66718b1b5c0dn@googlegroups.com>

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Subject: Re: Encoding of Traditional Chinese using ISO IR-100
From: david.go...@gmail.com (David Gobbi)
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 by: David Gobbi - Fri, 28 Apr 2023 16:50 UTC

Are you sure that these Chinese characters aren't just encoded in utf-8 in the DICOM file?

If they are, then notepad++ will probably be able to autodetect that they are utf-8 and display them properly, while applications that strictly enforce "ISO_IR 100" will display garbage.

If you can post a hex dump of one of the data elements that contains the characters, I could inspect it to see what encoding is used.

Re: Encoding of Traditional Chinese using ISO IR-100

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Subject: Re: Encoding of Traditional Chinese using ISO IR-100
From: mey...@mevis.de (Sebastian Meyer)
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 by: Sebastian Meyer - Fri, 28 Apr 2023 17:18 UTC

Hi David,
here is a dump of two of the affected tags, created with dcmdump:
>dcmdump +Qn +L +P InstitutionName +P StudyDescription "chinese_org.dcm"
(0008,0080) LO [&#169;&#201;&#164;&#175;&#186;&#238;&#166;X&#194;&#229;&#176;|] # 14, 1 InstitutionName
(0008,1030) LO [Low Dose Lung CT &#167;C&#190;&#175;&#182;q&#170;&#205;&#179;&#161;&#192;&#203;&#172;d(&#174;&#231;&#182;&#233;&#165;&#171;&#184;&#201;&#167;U)] # 44, 1 StudyDescription

Thanks for your help!

David Gobbi schrieb am Freitag, 28. April 2023 um 18:50:53 UTC+2:
> Are you sure that these Chinese characters aren't just encoded in utf-8 in the DICOM file?
>
> If they are, then notepad++ will probably be able to autodetect that they are utf-8 and display them properly, while applications that strictly enforce "ISO_IR 100" will display garbage.
>
> If you can post a hex dump of one of the data elements that contains the characters, I could inspect it to see what encoding is used.

Re: Encoding of Traditional Chinese using ISO IR-100

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Subject: Re: Encoding of Traditional Chinese using ISO IR-100
From: david.go...@gmail.com (David Gobbi)
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 by: David Gobbi - Fri, 28 Apr 2023 17:46 UTC

The encoding is Big5. I'm suprised that Notepad++ could autodetect it. Here is how I checked the encoding in Python:

b = bytearray([169,201,164,175,186,238,166,194,229,176])
print(b.decode('big5'))
怡仁綜汕撠

I tried UTF-8 first, then Big5, and voila, that's what it was.

Although Big5 isn't part of the DICOM standard, I have a tool that can dump these files:
https://github.com/dgobbi/vtk-dicom/wiki/dicomdump
https://github.com/dgobbi/vtk-dicom/releases/tag/v0.8.14

dicomdump --charset big5 chinese_org.dcm

Re: Encoding of Traditional Chinese using ISO IR-100

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Subject: Re: Encoding of Traditional Chinese using ISO IR-100
From: david.go...@gmail.com (David Gobbi)
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 by: David Gobbi - Fri, 28 Apr 2023 17:53 UTC

On Friday, 28 April 2023 at 11:46:49 UTC-6, David Gobbi wrote:

> dicomdump --charset big5 chinese_org.dcm

Ah, I forgot that for this to work, the original CharacterSet has to be removed first, e.g.

dcmodify -e 0008,0005 chinese_org.dcm

Re: Encoding of Traditional Chinese using ISO IR-100

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Subject: Re: Encoding of Traditional Chinese using ISO IR-100
From: mey...@mevis.de (Sebastian Meyer)
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 by: Sebastian Meyer - Fri, 28 Apr 2023 18:07 UTC

Thank you so much!

I was surprised by this capability of notepad++ as well. Then I learned that the primary author has Taiwanese roots: https://donho.github.io/

David Gobbi schrieb am Freitag, 28. April 2023 um 19:53:58 UTC+2:
> On Friday, 28 April 2023 at 11:46:49 UTC-6, David Gobbi wrote:
>
> > dicomdump --charset big5 chinese_org.dcm
>
> Ah, I forgot that for this to work, the original CharacterSet has to be removed first, e.g.
>
> dcmodify -e 0008,0005 chinese_org.dcm

1
server_pubkey.txt

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