What the camera needs to see pinholes on corrugated preprint
To see pinholes on corrugated preprint, you need this: a spot smaller than one pixel must not be written down as already seen. If you cannot see it, change the light or the resolution first. Do not loosen the threshold first.
To see pinholes on corrugated preprint, you need this: a spot smaller than one pixel must not be written down as already seen. If you cannot see it, change the light or the resolution first. Do not loosen the threshold first.
Fix the optics before you loosen anything
The solid is full of pin-tip white spots. If the picture cannot separate them at all, loosening the threshold only paints the barcode and the product name solid red. A spot smaller than one pixel must not be written down as already seen.
Optics
| Need | Enough looks like | Not enough looks like |
|---|---|---|
| A spot smaller than one pixel must not be written as already seen. | The solid is full of pin-tip white spots. | Only a blurry circle is left |
| About 3 pixels across | It shows up steadily | It comes and goes, and you still write that it can be caught |
| Barcode and product name are in the view | The critical spot is seen | You only light the decorative edge |
Try it on a sample sheet
- Confirm the picture can separate this: the solid is full of pin-tip white spots.
- Count about how many pixels it spans.
- If you cannot see it, change the light or the focus. Do not change the threshold.
