Vias as Fiducials

[m...@drivelog.net]

I have no fiducials on a Board. unfortunately...

Is it possible to use Vias instead?

Or Holes?

[Jason von Nieda]

That looks like it might work. Did you set the package footprint definition to the diameter of that pad?

Jason

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[m...@drivelog.net]

yes.

[Jason von Nieda]

Look at Troubleshooting on https://github.com/openpnp/openpnp/wiki/Fiducials#troubleshooting. Start with step 2. When complete, send me the most recent 6 images.

Jason

On Tue, Feb 21, 2017 at 5:41 PM <m...@drivelog.net> wrote:

yes.

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[m...@drivelog.net]

only 4 pics there....

[m...@drivelog.net]

now the error is clear: i had the body with and length not set to 0!

Now Fiducial Check performs OK!!!

[m...@drivelog.net]

Jason, very, very good Work from you, OpenPNP makes me really happy!

[Jason von Nieda]

Ah, yes! Sorry, I missed that too. Glad it's working now!

Jason

On Tue, Feb 21, 2017 at 5:59 PM <m...@drivelog.net> wrote:

now the error is clear: i had the body with and length not set to 0!

Now Fiducial Check performs OK!!!

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[m...@drivelog.net]

Today I have noticed that blurred headcam picture significant improves the recognition of octagonal vias as fiducials.
Sharp images delivers not so good or not get a result sometimes...

Jason, can I control the blurness of a sharp image by software like the Bottom Vision Pipeline Gaussian Filter?

[Jason von Nieda]

No, not yet. It's in development: https://github.com/openpnp/openpnp/pull/425

Should be released within the next few weeks.

Jason

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[Andrew Frazer]

the concern with using anything thats got a hole drilled through it is that the precision of the drilling is signincatly ( an order of magnitude ) less accurate than how the copper ends up on the board through the photo-etching process.  If the whole in the via doe'snt feature in your recognition then its probalby ok.. 

[Jason von Nieda]

Current fidicual finding uses template matching, so it is attempting to match the bright areas, not the dark. This makes it pretty robust as long as you are identifying a pad, even if it's drilled.

Jason

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