Surface defect inspection on black rubber sheet
As the rubber sheet travels between rollers, an overhead line-scan camera scans the surface under oblique lighting. Shape and texture deviations are marked; the defect position is written to a length-based rejection map.
The defect mask and length position are stored in the rejection map; region data is sent to the PLC for subsequent cutting or separation.
- 01 Travel
- 02 Line image
- 03 Texture
- 04 Mask
- 05 Rejection map
The sheet travels between rollers.
- Defect area
- —
- Record position
- —
Scenes are illustrative simulations; they are not customer references or performance guarantees.
Need
Black sheet absorbs light, so surface depressions and low-contrast marks can disappear. Waviness between rollers also changes its appearance.
Solution approach
The overhead line-scan camera works with an oblique bar light crossing the sheet width. Edge and shadow changes from directional lighting are compared with a local texture reference; masks are matched to travel position.
Process steps
- 01
Travel
The sheet travels between rollers.
- 02
Line image
Oblique light reveals surface boundaries.
- 03
Texture
The image is compared with a local texture reference.
- 04
Mask
The deviation region is marked in the image.
- 05
Rejection map
The defect is recorded against its length position.
Related applications
Let us assess your application together
We test your sample in our laboratory and report on resolution, optics and lighting selection.