What a camera needs to see picking on a textured wine label
Side light shows lifted fibre more easily than straight-on light. A steady sight needs about 3 pixels. If you cannot see it clearly, do not loosen the threshold.
To see picking on a textured wine label, side light shows lifted fibre more easily than straight-on light. 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
Fibre is lifted at the edge of a solid, and a white edge shows. If the image cannot separate them at all, moving the threshold only paints the wine name and the fine type solid red. Side light shows lifted fibre more easily than straight-on light.
Optics
| Need | Enough looks like | Not enough looks like |
|---|---|---|
| Side light shows lifted fibre more easily than straight-on light. | Fibre lifted at the edge of a solid, a white edge showing. | Only a blurry circle left |
| About 3 pixels across | Shows up steadily | Comes and goes, and you still write that it can be detected |
| Wine name and fine type in the field of view | The critical spot is seen | Only the decorative edge is lit |
Try it on a sample
- Confirm the image can separate it: Fibre lifted at the edge of a solid, a white edge showing.
- Count about how many pixels it spans.
- If you cannot see it clearly, change the light or the focus. Do not change the threshold.
