DICOM @ OFFIS

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 Forum: DCMTK - General   Topic: Open SSL Cipher Suites

 Post subject: Re: Open SSL Cipher Suites
Posted: Tue, 2018-02-13, 10:24 

Replies: 8
Views: 99


In order to add support for a specific TLS ciphersuite in DCMTK, you have to do the following: ⋅  Make sure that the ciphersuite is supported in the OpenSSL library you compile against (e.g. OpenSSL 1.1.0 needs to be compiled with specific flags to enable 3DES) ⋅  Add the ciphers...

 Forum: DCMTK - General   Topic: Issue related to FAQ: cannot change to unencapsulated repres

Posted: Tue, 2017-12-19, 17:18 

Replies: 11
Views: 420


To my knowledge, the "Se" parameter is used for spectral selection in progressive, lossy JPEG and should never be != 0 in a lossless JPEG bitstream. So this really looks like an invalid JPEG bitstream. Viewers that can successfully open it might either internally use the defective codec th...

 Forum: DCMTK - FAQ   Topic: FAQ #49: DCMTK for other languages than C++?

Posted: Mon, 2017-11-13, 09:38 

Replies: 0
Views: 355


:?: Is DCMTK available in other programming languages than C++? :!: No, we do not offer any other version of DCMTK. If you need an open source DICOM library for other programming languages/environments, you will have to look elsewhere. Some possible alternatives are: ⋅  Java: DCM4CHE Toolk...

 Forum: DCMTK - Installation   Topic: DCMTK on visual studio 2017 with ssl

Posted: Fri, 2017-11-03, 09:36 

Replies: 15
Views: 2118


The following post https://www.openssl.org/blog/blog/2016/08/24/sweet32/ explains the issue: Starting with OpenSSL 1.1.0, support for the 3DES ciphers is disabled by default. OpenSSL has to be configured with the “enable-weak-ssl-ciphers” option before compiling to re-active 3DES support. I guess we...

 Forum: DCMTK - General   Topic: dcmj2pnm segfault with large multiframe US

Posted: Thu, 2017-09-28, 14:15 

Replies: 20
Views: 2248


The bug has been registered in our bug tracker as issue #793: http://support.dcmtk.org/redmine/issues/793

 Forum: DCMTK - General   Topic: dcmj2pnm segfault with large multiframe US

Posted: Thu, 2017-09-28, 14:05 

Replies: 20
Views: 2248


It seems that you have found a bug in DCMTK here. The sample image you sent cannot be converted to an uncompressed DICOM format because the pixel data would be larger than 4 GBytes (1802 frames, 1280x960, RGB results in ca. 6.3 GBytes uncompressed). The dcmj2pnm tool is not too clever when it comes ...

 Forum: DCMTK - General   Topic: improving DIMSE_createFilestream

Posted: Mon, 2017-09-25, 16:48 

Replies: 1
Views: 203


Thanks for the suggestion. I have put that as a feature request http://support.dcmtk.org/redmine/issues/791 into our bugtracker.
However, this will not likely be implemented soon.

 Forum: DCMTK - General   Topic: Error while writing private tags in DcmDataset

Posted: Fri, 2017-08-18, 15:19 

Replies: 2
Views: 556


Lookup of Value Representations based on a private creator is not active when you create a dataset.
You have to include the VR explicitly in your call to putAndInsertString, just as you do here:
Code:
putAndInsertString(DcmTag(0x0029, 0x0010,EVR_LO), "mycomp")

 Forum: Other DICOM Tools   Topic: having trouble decoding an image with dcmdjp2k

Posted: Tue, 2017-08-15, 10:54 

Replies: 1
Views: 414


The dcmdjp2k tool is part of the DCMJP2K library, which is indeed a licensed product that extends DCMTK with JPEG 2000 support. The latest version is 3.6.2 (just as for the toolkit), but I don't think that any change to the JPEG 2000 decoder has taken place since the release mentioned in your post. ...

 Forum: DCMTK - General   Topic: Image displays white-out

Posted: Tue, 2017-08-15, 10:47 

Replies: 1
Views: 316


The image has a contrast depth of 16 bit/pixel (BitsStored = 16). A Windows DIB only offers 8 bit/pixel monochrome, so a reduction takes place during the conversion. You have to apply the VOI LUT transformation (e.g. based on the parameters Window Center and Window Width encoded in the image) to get...

 Forum: DCMTK - General   Topic: JPEG Lossless compression with bit-depth=12 possible?

Posted: Tue, 2017-08-15, 10:43 

Replies: 3
Views: 505


The bit depth is encoded in the JPEG bitstream, so the decoder can (and has to) determine from there what to do. Since the process you are referring to is lossless, In both cases the pixel data will be compressed without modification. With regard to the fact that DCMTK selects the 16 bit process in ...

 Forum: DCMTK - General   Topic: Issue with constructing cine loop from still images

Posted: Fri, 2017-07-28, 11:30 

Replies: 1
Views: 354


Perhaps your second frame image contains trailing "garbage" bytes at the end of the pixel data element, which would cause the effect you describe. You should perhaps compare the size of the PixelData element with the expected size (Rows * Columns * (BitsAllocated+7)/8). If the real size is...

 Forum: DCMTK - General   Topic: TLS question need help

 Post subject: Re: TLS question need help
Posted: Fri, 2017-07-28, 11:26 

Replies: 2
Views: 421


By default, the TLS protocol does not only use the public/private key pair extracted from the certificate and key file to securely exchange the random session key, it also verifies whether the certificate that is used by the remote side to identify itself is trustable. A certificate is trustable if ...

 Forum: DCMTK - General   Topic: socket select timeout

 Post subject: Re: socket select timeout
Posted: Mon, 2017-05-01, 16:59 

Replies: 11
Views: 3879


Your patch (with some minor modifications) has now been committed as commit 4185380, which should appear in the public git repository in a couple of days.

 Forum: DCMTK - General   Topic: DCMTK listed in the TMF "ToolPool"

Posted: Sat, 2017-04-01, 12:04 

Replies: 0
Views: 509


Image
DCMTK is listed in the TMF "ToolPool" database, a portal for IT tools for medical research that was launched in March 2017. TMF is the umbrella organization for networked medical research in Germany.
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