[Nexus] pixel_mask documentation

[yayahjb]

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 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
>