What a camera needs to see moiré on a pharma label
To see moiré on a pharma label, magnify until the dot arrangement is visible. If you cannot see it, change the light or the resolution first. Do not loosen the threshold first.
To see moiré on a pharma label, magnify until the dot arrangement is visible. If you cannot see it, change the light or the resolution first. Do not loosen the threshold first.
If you cannot see it, change the optics first
A regular pattern shows in the dot area. If the picture cannot separate that, loosening the threshold only paints the legal type and the barcode red. Magnify until the dot arrangement is visible.
Optics
| Need | Enough looks like | Not enough looks like |
|---|---|---|
| Magnify until the dot arrangement is visible. | A regular pattern shows in the dot area. | Only a blurry circle |
| About 3 pixels across | It shows steadily | It comes and goes, yet someone writes that it can be detected |
| The legal type and the barcode are in view | The critical place is in view | Only the decorative edge is lit |
Try it on a sample
- Confirm the picture separates this: a regular pattern shows in the dot area.
- Count about how many pixels it covers.
- If you cannot see it, change the light or the focus. Do not change the threshold.
