MAF3 with Cross Polarization Filter and external ligth

• TT

  M&F Staff

  M&F Staff

  Matter and Form staff

  Trevor Townsend Admin M&F Staff

  2/4/26, 10:09 PM

  You built this with the THREE API? If so, that is impressive indeed! 

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• CG

  Christian Gassner

  2/10/26, 11:08 PM

  Here some new results from texture image capturing in comparison to ...

  • Out of box (using projector as light source, no CP filter) with 3x images and HDR creation.
  • With external light, without Cross Polarization. 3x images and HDR creation.
  • With external light (polarized) and Cross Polarizing filter in front of left camera. 3x images and HDR creation.

  It proves again that even with additional light the dynamic range from the MAF3 camera is not enough to propperly capture light and dark areas with one single shot. HDR with 3x images completely changes the situation which is improving the image quality a lot!

  HDR with "out-of-box" situation (only projector used as light source, no external lights, no filter) is a real game changer. And this require just simple software implementation, without the need for any additional HW or modification.

  With the use of external light and HDR the image quality is further improving. But as said, also here HDR is needed because of low dynamic range of cameras. If reflections on glossy surface is not a problem than this aproach provides excellent (maybe best!) results. Using light box with only small holes for cameras could also help to eliminate reflections.

  When using external light with cross polarization lot of light is getting lost and also here HDR is absolutely mandatory. But the final HDR image is almost completely without reflections. For glossy and shiny surface this is the best soluton from my pov.

  In the tests i have used only one external light source place on the left side of the MAF3. To optimize the shaddows it's better to use two external lights, one right another left.

  Here the results:

  HDR with out-of-box image capturing:

  

  HDR with external light, no filter:

  

  HDR with polarized external light and CP filter in front of left MAF3 camera (cross polarization!):

  

  Which image you like most? Feedback very much appreciated.

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• JP

  J P New

  2/11/26, 10:56 PM

  @Christian Gassner 
  This idea and execution is superb. I can see clearly different between settings.
  
  Basic HDR setup has overcome tiny Sony sensor's DR limit some amount,
  
  then HDR + External light : probabaly due to MAF Three's projecting light's CRI quality is limited, hence external light (usually CRI 90 to 95) shows alot better color rendering which is closer to real life color.
  
  Last, HDR + External light + linear polarizing filter : previous two setup still shows direct reflection, especailly Basic HDR (from single spot light source). But magic of linear polarizing, this setup is definately the best. But HDR + external setup is very nice in general. ofc Basic HDR setup is alot better than stock color rendering. 
  
  Big thanks for your idea and example, also thanks for your 3d stl file of polarizing filter for the Three.

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