[Nexus] pixel_mask documentation

[Michael Rissi]

Hi Tobias,
Ok, then our documentation is not clear enough... Sorry for that!

The idea was that pixel_mask is a bit mask with each bit corresponding to a
special condition:
0 gap
1 dead
2 under responding
3 over responding
4 noisy
5 non uniform
6 cluster
7 virtual pixel

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.

Best regards,
Michael


On Tue, Jul 9, 2013 at 4:36 PM, <Tobias.Richter at diamond.ac.uk> wrote:

> I like that, but that is not what your documentation says. At least not
> according to Herbert.
>
> Tobias
>
> ________________________________
> From: Michael Rissi [michael.rissi at dectris.com]
> Sent: 09 July 2013 15:30
> To: Richter, Tobias (DLSLtd,RAL,DIA)
> Cc: Herbert J. Bernstein; nexus at nexusformat.org
> Subject: Re: [Nexus] pixel_mask documentation
>
> Hi Tobias and Herbert,
> A good pixel has the pixel mask value 0x00 00 00 00 , e.g. 0
> Best regards,
> Michael
>
>
> On Tue, Jul 9, 2013 at 4:26 PM, <Tobias.Richter at diamond.ac.uk<mailto:
> Tobias.Richter at diamond.ac.uk>> wrote:
> That looks like a nice comprehensive list, only I have no idea what value
> to put for a good pixel.
> And as zero is the single special value I'd prefer that for "good".
>
> Tobias
>
> ________________________________________
> From: yayahjb [yayahjb at gmail.com<mailto:yayahjb at gmail.com>]
> Sent: 09 July 2013 15:08
> To: Discussion forum for the NeXus data format
> Cc: Richter, Tobias (DLSLtd,RAL,DIA); michael.rissi at dectris.com<mailto:
> michael.rissi at dectris.com>
> Subject: Re: [Nexus] pixel_mask documentation
>
> The DECTRIS NeXus header specification includes under the detector
> specific information:
>
>
> pixel_mask      NX_UINT32       Pixel mask with the following bits
> corresponding
> to special pixels:
> 0 gap
> 1 dead
> 2 under responding
> 3 over responding
> 4 noisy
> 5 non uniform
> 6 cluster
> 7 virtual pixel
>
>
>
> I would suggest conforming the two lists.
>
> Regards,
>    Herbert
>
> On 7/9/13 9:28 AM, Tobias.Richter at diamond.ac.uk<mailto:
> Tobias.Richter at diamond.ac.uk> wrote:
> > Hi all,
> >
> > NXdetector has a pixel_mask field that says:
> >
> >    <field name="pixel_mask" type="NX_FLOAT">
> >      <doc>The pixel mask for the detector. Contains information about
> dead, blind or high pixels.</doc>
> >      <dimensions rank="2">
> >         <dim index="1" value="i"/>
> >         <dim index="2" value="j"/>
> >      </dimensions>
> >    </field>
> >
> > First I am surprised it is a NX_FLOAT. And second there is no indication
> what values are used for what type of pixel.
> >
> > I'd assume anything non-zero means 'do not use pixel'.
> >
> > Just to have a start I'd suggest changing this to INT and useing:
> >
> > 0: pixel okay
> > 1: dead
> > 2: blind (non-existent virtual pixel)
> > 3: high
> >
> > If I don't hear otherwise I'd update the definition with that
> clarification in two weeks.
> >
> > Kind regards,
> >
> > Tobias
> >
>
>
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> use, copy, retain, distribute or disclose the information in or attached to
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> Any opinions expressed within this e-mail are those of the individual and
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> Diamond Light Source Ltd. cannot guarantee that this e-mail or any
> attachments are free from viruses and we cannot accept liability for any
> damage which you may sustain as a result of software viruses which may be
> transmitted in or with the message.
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> Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom
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-- 
**************************************************
Michael Rissi, Ph.D.
Product Development

DECTRIS Ltd.
Neuenhoferstr. 107
5400 Baden
Switzerland

+41 56 500 2100 general
+41 56 500 2101 fax
+41 56 500 2125 direct
michael.rissi at dectris.com
www.dectris.com
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