July 18, 2019, 04:09:00 PM
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 iRvision failing images within set limits

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June 20, 2019, 07:51:42 AM
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HeadlessEng


Hi guys,

I have encountered a strange occurrence when using the vision system. The system is failing an image which is within all the limits set in the program. I've gone through the other limits and tools and I have checked each individually The problem seems to be with the scaling limit. The limit is set from 98 – 102, the scale is reading 98.5 and the part is being failed. When the limit is changed to 97 – 102 the part passes.  :wallbash: I haven't come up with any logical explanation as to why this occurs so hopefully someone can provide some insight.

TIA

Edit: Fixed wording
« Last Edit: June 21, 2019, 10:56:20 AM by HeadlessEng »

Today at 04:09:00 PM
Reply #1

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June 20, 2019, 10:37:31 AM
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stare284


An image of the failed part compared to the passed part with the results would be beneficial to help answer your question.

Is the camera fix mounted or robot mounted?
Is the part on a moving surface or stationary?
Is the part skewed at all?

June 20, 2019, 10:51:36 AM
Reply #2
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HeadlessEng


The camera is fix mounted and the part is stationary.
Its the same image which passes at 97-102 but fails at 98-102.
I'll post the image once I get back.

June 20, 2019, 11:24:27 AM
Reply #3
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stare284


You can trying turning up the elasticity a bit. It is probably set to 1.5 now, take it to 1.75 or 2.

June 20, 2019, 12:52:50 PM
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fastfingers


The scale limits are 97-102 and the score is 98.5. I'm not sure how much experience you have but remember that scale and score are two different things. If you open the scale limits and it passes, scale should be the issue. What scale value was returned when the process failed? It must have been between 97 and 98. You can use the 'show almost found' checkbox to help diagnose the problem. Hope this helps.

June 20, 2019, 01:27:11 PM
Reply #5
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HeadlessEng


Sorry, my fault for incorrectly wording it. Its reporting back the scale as 98.5 not the score. The elasticity was already set to 3 pixels so I'd be surprised if that was the issue.

June 20, 2019, 02:20:53 PM
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fastfingers


Ok. Are you able to repeat the failure with the original settings and use 'show almost found'? This can be really helpful to show what is wrong.

Today at 04:09:00 PM
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June 20, 2019, 02:22:52 PM
Reply #7
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HeadlessEng


Image and results for the part which failed. I'm hoping that its something simple which I missed that's causing it at this stage. Only difference between the images are the limits for the scaling. I've gone through enabling each DOF individually and scale is the only one which changes result.

June 20, 2019, 02:49:05 PM
Reply #8
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fastfingers


One thing I see is the training stability for location is 'P' which means poor. This could be contributing your problem. Maybe reteach the locator tool and try to improve the location stability? You could copy this whole vision process and modify the copy, keeping the original as-is so you have something to refer back to. The contrast seems a fairly low; are you able to improve it? One other thought is to check the aspect box and leave the values of 98 and 100 for min/max. You are currently expecting the process to find the same exact image with no 'tilt' or aspect skew and this may be difficult due to the poor location stability.

June 21, 2019, 09:09:59 AM
Reply #9
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HeadlessEng


I'll try reteaching the image and see if that helps. Still don't understand why it would fail an image even though it was reporting the scale as between the limits which were set.

June 21, 2019, 11:00:22 AM
Reply #10
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fastfingers


I agree. I'm thinking the failures are somehow related to scale and/or training stability.

July 12, 2019, 12:21:43 PM
Reply #11
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andreic


Do you have a parent tool of this GPM? I think the parent tool fails in finding something.


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