What a camera needs to see a gear mark on a textured wine label
To see a gear mark on a textured wine label, the field has to hold several tooth pitches, or you can't measure the spacing. If you can't see it, change the light or the resolution first. Don't loosen the threshold first.
To see a gear mark on a textured wine label, the field has to hold several tooth pitches, or you can't measure the spacing. If you can't see it, change the light or the resolution first. Don't loosen the threshold first.
If you can't see it, fix the optics first
Light and dark bars repeat at a fixed tooth pitch. If the image can't separate it at all, changing the threshold only paints the wine name and the fine type of the textured wine label red. The field has to hold several tooth pitches, or you can't measure the spacing.
Optics
| Need | Enough | Not enough |
|---|---|---|
| The field has to hold several tooth pitches, or you can't measure the spacing. | Light and dark bars repeat at a fixed tooth pitch. | Only a blurry circle left |
| About 3 pixels across | Shows steadily | It comes and goes, and you still log it as detectable |
| The wine name and the fine type are in the field of view | The critical spot is seen | You only light the decorative edge |
Try it on a sample
- Confirm you can separate it in the image: Light and dark bars repeat at a fixed tooth pitch.
- Count about how many pixels it covers.
- If you can't see it clearly, change the light or the focus. Don't change the threshold.
