Why can't a camera see the defect?
When defects are imaged by an image sensor or other means, are there many cases in which defects are clearly visible visually but not well captured in the image? Do you feel something different when you try different illuminators? A difference between the camera and the eye? [...].
Appearance Inspection Methods
The method of visual inspection is easy to understand if we consider whether the object is 1) stable or not, and 2) simple or not. If the object is stable, it can be inspected based on "whether it is the same as other objects. If the object is simple, it can be inspected "whether it is the same as it should be" which can be inferred from its appearance [...].
Crisis of "Japanese Quality
We need to rethink the way visual inspections are conducted in manufacturing. After investing resources and working hard to make a product, a trained visual inspector inspects it hard, finds minor flaws, and discards it as defective. Many of them have no functional problems.
DEFEAT K COMPANY
WHEN I TALK WITH PEOPLE IN THE MACHINE VISION INDUSTRY, I OFTEN HEAR "DEFEAT COMPANY K." IT IS TRUE THAT COMPANY K ENTERED THE MARKET ABOUT 20 YEARS AGO AND TOOK IT WITH THEM ALL AT ONCE. IT IS TRUE THAT K CORP. ENTERED THE MARKET ABOUT 20 YEARS AGO AND SEEMS TO HAVE TAKEN IT BY STORM. HOWEVER, I HAVE A DIFFERENT POINT OF VIEW. ・THEY HAVE MADE IT CLOSER TO THE PRICE RANGE DESIRED BY END-USERS [...].
Full inspection is required.
I think the important thing in automatic inspection is "full surface inspection". In the case of visual inspection, the entire surface of the product is somehow seen from the moment it is picked up. However, in the case of automatic inspection, only the surface imaged by the camera is inspected, and only the set items are inspected. What kind of terrible defects are found in other areas [...]?