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Brief answer
Define the feature to detect and the line’s action after inspection. Choose the camera, lighting, optics and algorithm for actual samples and conditions.
Describe the inspection decision
Classify defects and define a rule for questionable products. Accepting a defective part and rejecting a good part have different consequences. Discuss them separately instead of using one undefined accuracy figure.
Collect a representative sample
You need acceptable and defective samples, different batches, surface variants and positions. Catalog images are insufficient. Preserve capture conditions and the origin of each example so the test can be repeated and explained.
Check the installation location
Consider field of view, distance, lighting, vibration, contamination and movement speed. Cognex documentation specifically addresses lighting and image formation. Do not assume another lens or mounting location preserves a previous test result.
Test the entire route
Test recognition as well as the line signal, rejection mechanism, result recording and behavior during communication loss. A separate test dataset reveals behavior on new products. Document test conditions and applicability limits in the report.
What to prepare
- Defect definitions
- A set of real samples
- Line speed and layout
- Rules for handling questionable products
How to structure the comparison
| Field | What to record |
|---|---|
| Criterion | A requirement that affects the decision. |
| Confirmation | A document, measurement, answer or test result. |
| Open question | What is unknown, who clarifies it and which decision depends on the answer. |
Sources and limitations of use
The links below explain individual technical principles; choosing a specific solution requires current documentation and checks of operating conditions.
Questions and answers
Can we start without all the data?
Yes. Describe the current situation and flag unknown parameters. The materials list helps preparation but is not a mandatory questionnaire for initial contact.
Can this article alone support a decision?
This material helps structure questions. Selection for a particular company requires baseline data, checks of constraints and evidence for the option under consideration.