<div dir="ltr">Hi Tobias,<div style>Ok, then our documentation is not clear enough... Sorry for that!</div><div style><br></div><div style>The idea was that pixel_mask is a bit mask with each bit corresponding to a special condition:</div>
<div style><span style="color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">0 gap</span><br style="border:0px none;margin:0px;padding:0px;color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">
<span style="color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">1 dead</span><br style="border:0px none;margin:0px;padding:0px;color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">
<span style="color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">2 under responding</span><br style="border:0px none;margin:0px;padding:0px;color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">
<span style="color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">3 over responding</span><br style="border:0px none;margin:0px;padding:0px;color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">
<span style="color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">4 noisy</span><br style="border:0px none;margin:0px;padding:0px;color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">
<span style="color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">5 non uniform</span><br style="border:0px none;margin:0px;padding:0px;color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">
<span style="color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">6 cluster</span><br style="border:0px none;margin:0px;padding:0px;color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">
<span style="color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)">7 virtual pixel</span><br></div><div style><span style="color:rgb(51,51,51);font-family:Verdana,Geneva,sans-serif;font-size:14px;background-color:rgb(221,221,221)"><br>
</span></div><div style><font color="#333333" face="Verdana, Geneva, sans-serif"><span style="font-size:14px">So e.g. when a pixel is noisy, you will set bit number 4. When the pixel is working properly, all bits are unset, and the pixel mask has the value 0 for the pixel.</span></font></div>
<div style><font color="#333333" face="Verdana, Geneva, sans-serif"><span style="font-size:14px"><br></span></font></div><div style><font color="#333333" face="Verdana, Geneva, sans-serif"><span style="font-size:14px">Best regards,</span></font></div>
<div style><font color="#333333" face="Verdana, Geneva, sans-serif"><span style="font-size:14px">Michael</span></font></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jul 9, 2013 at 4:36 PM, <span dir="ltr"><<a href="mailto:Tobias.Richter@diamond.ac.uk" target="_blank">Tobias.Richter@diamond.ac.uk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I like that, but that is not what your documentation says. At least not according to Herbert.<br>
<br>
Tobias<br>
<br>
________________________________<br>
From: Michael Rissi [<a href="mailto:michael.rissi@dectris.com">michael.rissi@dectris.com</a>]<br>
Sent: 09 July 2013 15:30<br>
To: Richter, Tobias (DLSLtd,RAL,DIA)<br>
Cc: Herbert J. Bernstein; <a href="mailto:nexus@nexusformat.org">nexus@nexusformat.org</a><br>
<div class="im">Subject: Re: [Nexus] pixel_mask documentation<br>
<br>
</div><div class="im">Hi Tobias and Herbert,<br>
A good pixel has the pixel mask value 0x00 00 00 00 , e.g. 0<br>
Best regards,<br>
Michael<br>
<br>
<br>
</div><div class="im">On Tue, Jul 9, 2013 at 4:26 PM, <<a href="mailto:Tobias.Richter@diamond.ac.uk">Tobias.Richter@diamond.ac.uk</a><mailto:<a href="mailto:Tobias.Richter@diamond.ac.uk">Tobias.Richter@diamond.ac.uk</a>>> wrote:<br>
That looks like a nice comprehensive list, only I have no idea what value to put for a good pixel.<br>
And as zero is the single special value I'd prefer that for "good".<br>
<br>
Tobias<br>
<br>
________________________________________<br>
</div>From: yayahjb [<a href="mailto:yayahjb@gmail.com">yayahjb@gmail.com</a><mailto:<a href="mailto:yayahjb@gmail.com">yayahjb@gmail.com</a>>]<br>
<div class="im">Sent: 09 July 2013 15:08<br>
To: Discussion forum for the NeXus data format<br>
</div>Cc: Richter, Tobias (DLSLtd,RAL,DIA); <a href="mailto:michael.rissi@dectris.com">michael.rissi@dectris.com</a><mailto:<a href="mailto:michael.rissi@dectris.com">michael.rissi@dectris.com</a>><br>
<div class="im">Subject: Re: [Nexus] pixel_mask documentation<br>
<br>
The DECTRIS NeXus header specification includes under the detector<br>
specific information:<br>
<br>
<br>
pixel_mask NX_UINT32 Pixel mask with the following bits corresponding<br>
to special pixels:<br>
0 gap<br>
1 dead<br>
2 under responding<br>
3 over responding<br>
4 noisy<br>
5 non uniform<br>
6 cluster<br>
7 virtual pixel<br>
<br>
<br>
<br>
I would suggest conforming the two lists.<br>
<br>
Regards,<br>
Herbert<br>
<br>
</div><div><div class="h5">On 7/9/13 9:28 AM, <a href="mailto:Tobias.Richter@diamond.ac.uk">Tobias.Richter@diamond.ac.uk</a><mailto:<a href="mailto:Tobias.Richter@diamond.ac.uk">Tobias.Richter@diamond.ac.uk</a>> wrote:<br>
> Hi all,<br>
><br>
> NXdetector has a pixel_mask field that says:<br>
><br>
> <field name="pixel_mask" type="NX_FLOAT"><br>
> <doc>The pixel mask for the detector. Contains information about dead, blind or high pixels.</doc><br>
> <dimensions rank="2"><br>
> <dim index="1" value="i"/><br>
> <dim index="2" value="j"/><br>
> </dimensions><br>
> </field><br>
><br>
> First I am surprised it is a NX_FLOAT. And second there is no indication what values are used for what type of pixel.<br>
><br>
> I'd assume anything non-zero means 'do not use pixel'.<br>
><br>
> Just to have a start I'd suggest changing this to INT and useing:<br>
><br>
> 0: pixel okay<br>
> 1: dead<br>
> 2: blind (non-existent virtual pixel)<br>
> 3: high<br>
><br>
> If I don't hear otherwise I'd update the definition with that clarification in two weeks.<br>
><br>
> Kind regards,<br>
><br>
> Tobias<br>
><br>
<br>
<br>
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