Which sensor to get which is cost effective?

RecFusion
1

Hi All,
I bought a 3d printer and built a Mostly Printed CNC Router (MPCNC router) so I would like to start printing and routing items.
There seems to be two options photogrammetry or scanning.
I bought a Kinnect v1 from eBay and had a play but unless I’m going shrink the output the resolution isn’t very good.
I was thinking about an Intel RealSenseD435 as the Azure Kinect seems a bit expensive to get for me here in the UK.
I’m looking for a sensor which will allow me to scan the attached item which is about 30cm in diameter.
Any advice would be appreciated.
Regards,
Dave T.

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2

Hello Dave,

for smaller objects like yours we would recommend Intel SR305 as it allows to scan an object from a closer range (around 30 cm) which would increase the chance of capturing small details in the object. The second choice could be Intel D415, since it has a higher accuracy for
close-range scenes than D435.

However, this particular object is relatively flat, so we can’t guarantee that any of these sensors would capture the shape variation well.

Best regards,
Olga

3

Thanks Olga for the information.
It seems like Intel are still selling all of them from the States.

4

I’ve attempted to buy a sr305 but there was a couple of parts missing.
I’ve come across two issues:

  1. The sr305 needs a usb3 connection and the cable with the camera is short (1M) so a card and a extender resolved this.
  2. Black items are invisible to the sensor. This is a bummer as a large number of items have black on the surface of them. I’m assuming its the sensor using light to workout the distance and black doesn’t reflect the light. Is there a solution except for changing the black surfaces to a different colour?
    Regards,
    David Tovee
5

Hello Dave,

you are right, SR305 does have a problem of not being able to capture depth of black surfaces. You could try to lower the laser power, this might improve the situation a bit. There is also a thread on Intel’s forum discussing this issue: https://community.intel.com/t5/Items-with-no-label/Depth-map-of-black-pixels-in-an-image-is-not-coming/td-p/354011?profile.language=en. You could try some suggestions fro there.

Best regards,
Olga

6

Hi Olga,
Thanks for your help but SR305 resolution seems to be quite poor.
I think my expectations are to high for the capabilities of the sensor.
Is there a better for scanning smaller items?
Regards,
David Tovee

7

Hello David,

unfortunately there is nothing better. From all the sensors that we support this one is the best for scanning small objects.

Best regards,
Olga