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<div class="moz-cite-prefix">Le 10/08/2016 à 17:44, Dženan Zukić a écrit :<br>
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For posterity: the value Francois was looking for was a float, and the four bytes 00 80 93 43 indeed encode the float value 295.0</div>
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The code to convert to float:</div>
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<div class="gmail_default"><font face="monospace, monospace">float * fDecoded = (float *)&decoded[0];</font></div>
<div class="gmail_default"><font face="monospace, monospace">std::cout << "float = " << (*fDecoded) << std::endl;</font></div>
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<div class="gmail_quote">On Wed, Aug 10, 2016 at 10:43 AM, Dženan Zukić <span dir="ltr">
<<a moz-do-not-send="true" href="mailto:dzenanz@gmail.com" target="_blank">dzenanz@gmail.com</a>></span> wrote:<br>
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Can you share (either with the list or just me) this DICOM image (optionally anonymized) and a runnable example which you use to read it?</div>
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<div class="gmail_quote">On Wed, Aug 10, 2016 at 10:41 AM, <span dir="ltr"><<a moz-do-not-send="true" href="mailto:Francois.GIRINON@ensam.eu" target="_blank">Francois.GIRINON@ensam.eu</a>></span> wrote:<br>
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<div>Le 10/08/2016 à 16:23, Dženan Zukić a écrit :<br>
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Does Matlab have special support for those private tags? They may have special encoding besides base64 applied by ITK DICOM dictionary.</div>
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<div class="gmail_quote">On Wed, Aug 10, 2016 at 10:13 AM, <span dir="ltr"><<a moz-do-not-send="true" href="mailto:Francois.GIRINON@ensam.eu" target="_blank">Francois.GIRINON@ensam.eu</a>></span> wrote:<br>
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<div>Le 10/08/2016 à 16:05, Dženan Zukić a écrit :<br>
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In fact, this <a moz-do-not-send="true" href="http://www.opinionatedgeek.com/dotnet/tools/base64decode/" target="_blank">
decodes</a> to 00 80 93 43 - four bytes given here in hexadecimal notation. The decoder you linked does not seem to work correctly. I don't know why you expect 295 there.</div>
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<div class="gmail_quote">On Wed, Aug 10, 2016 at 9:58 AM, <span dir="ltr"><<a moz-do-not-send="true" href="mailto:Francois.GIRINON@ensam.eu" target="_blank">Francois.GIRINON@ensam.eu</a>></span> wrote:<br>
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<div>Le 10/08/2016 à 14:35, Dženan Zukić a écrit :<br>
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Hi Francois,</div>
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is this base64 encoded? You should perhaps do base64 decode on the return string to get the binary value.</div>
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Regards,</div>
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Dženan</div>
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<div class="gmail_quote">On Wed, Aug 10, 2016 at 7:15 AM, <span dir="ltr"><<a moz-do-not-send="true" href="mailto:Francois.GIRINON@ensam.eu" target="_blank">Francois.GIRINON@ensam.eu</a>></span> wrote:<br>
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<p>Hi,</p>
<p>I'm trying to read private dicom tags using :</p>
<p> ImageIOType::Pointer dicomIO = ImageIOType::New();<br>
...<br>
dicomIO->SetLoadPrivateTags(tr<wbr>ue);<br>
std::string offsetFromBottomStr;</p>
<p> std::string offsetFromBottom = "0863|1041";<br>
dicomIO->GetValueFromTag(offse<wbr>tFromBottom, offsetFromBottomStr);</p>
<p>The value <i>offsetFromBottomStr </i>returned is <i>AICTQw==</i><br>
How does it come and how can I fix this ?</p>
<p>Thank you,<br>
François.<br>
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<p>Thanks for your answer. You might be right, they say <a moz-do-not-send="true" href="http://public.kitware.com/pipermail/community/2016-May/011426.html" target="_blank">
here</a> <i>private tags and encodes the with Base64 into strings.<br>
</i>Unfortunately, <i>AICTQw== </i>should correspond to 295 and according to <a moz-do-not-send="true" href="https://www.base64decode.org/" target="_blank">
https://www.base64decode.org/</a>, <i>AICTQw==</i> is a C.<br>
Besides, I don't understand how does itksysBase64_Decode works (I'm not sure I should use this method too).<br>
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<p>In fact I have previously red the dicom using matlab and the value of the private tag 0863 1041 is 295.<br>
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<p>I don't know, it doesn't seem really matlab specific, <a moz-do-not-send="true" href="https://github.com/gerddie/ginkgocadx" target="_blank">
this tool</a> also gets a dicom inspector module which displays 295.<br>
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<p>OK !!! Thank you very much for your help !<br>
So the final solution was:<br>
<b><i> int dlen = gdcm::Base64::GetDecodeLength(offsetFromBottomStr.c_str(), offsetFromBottomStr.size() );</i></b><b><i><br>
</i></b><b><i><br>
</i></b><b><i> std::string decoded;</i></b><b><i><br>
</i></b><b><i> decoded.resize( dlen );</i></b><b><i><br>
</i></b><b><i> gdcm::Base64::Decode( &decoded[0], decoded.size(), offsetFromBottomStr.c_str(), offsetFromBottomStr.size() );</i></b><b><i><br>
</i></b><b><i><br>
</i></b><b><i> float * fDecoded = (float *)&decoded[0];</i></b><b><i><br>
</i></b><b><i> std::cout << "float = " << (*fDecoded) << std::endl;</i></b><br>
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