IT'S NOT ENOUGH TO BE ABLE TO SEE THE NG PART.

THE VISUAL INSPECTION IS TO PREVENT THE OUTFLOW OF NG PRODUCTS,

IT IS NATURAL TO TRY TO MAKE SURE THAT NG AREAS ARE VISIBLE TO THE CAMERA.

HOWEVER, IF THE OK AREAS OTHER THAN THE NG AREAS ARE ALSO CLEARLY VISIBLE

THE LINE BETWEEN OK AND NG IS BECOMING MORE DIFFICULT TO DRAW.

So it is not simply a matter of increasing the resolution of the camera,

Adding ingenuity to lighting, of course,

In some cases, we dare to reduce the resolution of the camera.

It may also blur the image.

THAT WAY ONLY NG AREAS SHOULD BE SHOWN AS MUCH AS POSSIBLE.

NG AREAS ARE CLEARLY VISIBLE

indicates word or phrase being defined

THE PARTS I WANT TO BE OK ALSO LOOK LIKE NG.

We want to be aware of this.