Search found 17 matches

by bennyedward
Fri Dec 29, 2017 6:55 pm
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

Re: to detect small foreign objects

Hi,
Thanks again for your guidance.
by bennyedward
Fri Dec 29, 2017 5:11 am
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

Re: to detect small foreign objects

Hi,
Thank you for your advice.
I have tried the attached script and I receive "OSError: Image format is not supported" message when set the frame size to VGA.
Does img.mean() not work in VGA mode?
by bennyedward
Thu Dec 28, 2017 10:30 pm
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

Re: to detect small foreign objects

Hi,
Below is my question:
1) What is the effect if the offset value is increased or decreased?
By using this new method:
1) Does the object color/grayscale threshold value still have to be defined?
2) Does img.mean() has a returned object, so draw_rectangle() can be used on found object?
by bennyedward
Thu Dec 28, 2017 10:22 pm
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

Re: to detect small foreign objects

Very sorry ...
Please kindly continue to teach.
by bennyedward
Thu Dec 28, 2017 5:09 am
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

Re: to detect small foreign objects

Hi,
Thank you very much for the good news and for providing the required features for our application.
Yes, I need the feature now and please make a firmware image available to me.
Thank you.
by bennyedward
Tue Dec 26, 2017 9:27 pm
Forum: Technical Discussion
Topic: To find defects in the rubber ring / gasket
Replies: 2
Views: 240

Re: To find defects in the rubber ring / gasket

Hi,
Thank you very much for your guidance.
I will try it.
by bennyedward
Fri Dec 22, 2017 5:30 am
Forum: Technical Discussion
Topic: To find defects in the rubber ring / gasket
Replies: 2
Views: 240

To find defects in the rubber ring / gasket

Hi,
We make the components A and B as shown in figures 1 and 4.
Our quality inspection found 2 defects in each component, i.e "no cut" and "non-uniform width" as shown in Figures 2, 3 and 5 (no photos for no cut defect in component B).
Can you advise how to use OpenMV to find these defects?
Thank you.
by bennyedward
Tue Dec 12, 2017 11:17 pm
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

Re: to detect small foreign objects

Hi,
Thank you very much for your suggestion.
I will try to improve the lighting as you suggest.
by bennyedward
Tue Dec 12, 2017 7:17 am
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

Re: to detect small foreign objects

Sorry, previous post is the detection result of 3 objects, not 4.
by bennyedward
Tue Dec 12, 2017 5:03 am
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

Re: to detect small foreign objects

Hi, Attached is the result of camera detection of 4 objects. The camera can detect 1.5 mm dirt (fb1), with and without additional lighting. But it can not detect 1 mm cloth fiber (fb2) and 3.5 mm human eyelashes (fb3). Can you suggest another method to detect fb2 and fb3? How to reduce the influence...
by bennyedward
Sat Dec 09, 2017 8:41 pm
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

Re: to detect small foreign objects

Thank you for your latest answer
Please ignore my last question, as it has been answered.
by bennyedward
Sat Dec 09, 2017 8:39 pm
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

Re: to detect small foreign objects

Is it by calling "image.find_blobs" twice with separate thresholds? The first is for the 500 pixels and the second is for the 100 pixels?
Sorry to bother you with this kind of question.
by bennyedward
Sat Dec 09, 2017 8:22 pm
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

Re: to detect small foreign objects

Hi, Thanks for your guidance and strong support. Please advice further, where should define two pixels values, i.e. 500 and 100 in the instruction below? image.find_blobs(thresholds[, roi=Auto, x_stride=2, y_stride=1, invert=False, area_threshold=10, pixels_threshold=10, merge=False, margin=0, thres...
by bennyedward
Fri Dec 08, 2017 3:01 am
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

Re: to detect small foreign objects

Sorry.
1st object is cloth fiber (1 millimeter length) & 2nd object is human eyelashes (3.5 millimeter length)
by bennyedward
Fri Dec 08, 2017 3:00 am
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

Re: to detect small foreign objects

Hi,
This is what the camera sees from a distance of less than 10 millimeters and from an angle of about 45 degrees.
1st object is human eyelashes (3.5 millimeter length) & 2nd object is cloth fiber (1 millimeter length).
by bennyedward
Tue Dec 05, 2017 4:24 am
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

Re: to detect small foreign objects

Very sorry forgot to attach a photo. Kindly refer to the attachment in this post.
Thank you very much for your advice.
by bennyedward
Tue Dec 05, 2017 3:06 am
Forum: Technical Discussion
Topic: to detect small foreign objects
Replies: 28
Views: 4022

to detect small foreign objects

My application is to detect small foreign objects (please see attached photo) such as cloth fibers that stick between (shiny) transparent film and white synthetic paper surface. Can you suggest how to use OpenMV Cam for this application? Is there any recommended microscope lens for use with OpenMV C...

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