Finding screen-film creases by watching reflected stripes bend
A clear or glossy screen film can hide a crease in a normal photograph. Under a striped inspection light, the same crease bends the reflected pattern and creates a feature the camera can locate.
Inspect the change in reflection, not just the film colour.
Manufacturer test image
- Test lightLS-SDL-0017, white
- SignalLocal stripe deformation
- Emitting area (spec)100 × 100 mm
- MethodReflected-pattern inspection
Explore it in 3D
Camera and available lens CAD are published models. Lens and light envelopes use printed dimensions. The linked station uses its published base size and column height; carriage, brackets, fittings, parts and spacing are illustrative. Confirm load, travel, fasteners and clearances before ordering. Light paths explain the arrangement and do not simulate optical performance.
Lighting manufacturer's test sheet
What the camera saw
Images from the manufacturer's application test, cropped; the original annotations are kept and nothing is generated or enhanced. Drag a comparison slider, or open any image full size.
The challenge
Thin film is reflective and can have very little visible texture. A crease changes local slope without necessarily changing colour.
The inspection needs a repeatable way to distinguish that shape change from lighting variation and normal film movement.
How it was solved
The application sheet shows a screen film and its capture under the white LS-SDL-0017 striped light. A red rectangle and inset identify the region where the reflected stripes deform.
The illustrated rig shows a proposed camera and macro lens looking through a patterned light at a film coupon. The source does not identify its camera, lens, stripe pitch or exact working distance.
Why it works
- 1
The defect changes the direction of reflection, which changes the position and shape of the stripes in the camera image.
- 2
Pattern deformation can provide contrast where the unpatterned surface offers little natural detail.
- 3
The capture demonstrates visibility of a crease; it does not establish crease depth or an automatic classifier performance.
Lighting manufacturer's test sheet
Evidence you can inspect
The manufacturer's test image shows distorted reflected stripes at the marked crease.
The source identifies the white LS-SDL-0017; no measurement or detection rate is supplied.
This is a contrast demonstration, not a calibrated 3D surface scan.
From image contrast to a production decision
What to validate on your part
- 01
Try both orientations
Rotate the film relative to the stripes to check sensitivity to different crease directions.
- 02
Control reflections
Keep the pose and surrounding light stable across good and defective samples.
- 03
Confirm coverage
Check the required inspection window and sampling before choosing light size and lens.
From the demo to your test bench
Parts in this setup
LightTested
LS-SDL-0017
Striped shadowless light, 140 x 140 x 11.5 mm (LS-SDL-0017)
White striped light identified in the screen-film crease test; use a local inspection window or verify coverage for larger films.
$539.00
In proposed setup
CameraOur pick
MV-CS050-10GM(NPOE)
Hikrobot MV-CS050-10GM(NPOE) 5 MP GigE area scan camera, IMX264, Gen 2 basic version, Mono, Without PoE
5 MP monochrome area-scan camera; a starting point for a contrast trial. Confirm sampling against your smallest defect.Not available in the United States. Available for delivery to other countries.
$819.00
In proposed setup
LensOur pick
LS-FFL-1454
16 mm, F2.8, 1.1", C-mount, Macro lens (52 mm (-0.25X) to 546 mm (-0.03X)) (LS-FFL-1454)
16 mm C-mount macro lens, 0.25x to 0.03x magnification. Confirm field of view and working distance on your part.
$319.00
In proposed setup
Camera test stationOur pick
LS-MNT-0097
Camera stand with XZ adjustment and glass tray, height 600 mm, 600 x 450 mm base (LS-MNT-0097)
600 mm column, 600 × 450 mm breadboard, XZ adjustment, glass tray and two lighting holders as listed. Proposed bench fixture; confirm loads, travel and camera/lens clamps.
$1,309.00
In proposed setup
"Tested" marks the part the manufacturer used in its application test. "Our pick" is our proposed alternative or supporting part, not tested by the manufacturer in this set-up. Confirm colour, optics, controllers, power supplies, cables and mounting before ordering.
The set-up
| Test light | LS-SDL-0017, white |
|---|---|
| Housing (printed) | 140 × 140 × 11.5 mm |
| Emitting area (printed) | 100 × 100 mm |
| Test distance and exposure | Not stated in this application sheet |
| Mounting (proposed) | LS-MNT-0097 · camera test station with glass tray and two lighting holders |
Mount the optics with intent
The station is an optical test bench, with its two lighting holders included in the catalog listing. The 3D column and base follow the published height and footprint. Carriages, clamps and part supports are schematic: confirm camera screw pattern, lens support, light fasteners, permissible load and actual travel before ordering.
Complete the electrical system
Select a controller against the exact light voltage, drive mode and power, then confirm camera data/power/I/O cables and a suitable PC. These are not silently added to the proposed optical kit.
Build this system
Start from this setup, adapt it to your part.
The configurator opens with this study's camera, lens, light and station picked. Swap any part, check fit and price, then buy or ask for a quote.
Camera and available lens CAD are published models. Lens and light envelopes use printed dimensions. The linked station uses its published base size and column height; carriage, brackets, fittings, parts and spacing are illustrative. Confirm load, travel, fasteners and clearances before ordering. Light paths explain the arrangement and do not simulate optical performance.
Glass, displays and optics
Related case studies
Glass, displays and optics
Cover-glass ink border in IR
Image both edges sharply, then calibrate before reporting a distance.Light in sourceLS-RNG-0341 · 940 nmExplore the study
Glass, displays and optics
Three line-light trials on display glass
Choose a lighting direction on your screen before comparing light output.Proposed light housing (spec)220 × 53 × 121.5 mmExplore the study
Glass, displays and optics
Grid spacing on a glass cover plate
Clear stripes support measurement only after the edge rule and scale are proven.Proposed light housing (spec)74 × 50 × 50 mmExplore the study
Make the next trial specific.
Tell us the part size, smallest defect or tolerance, available working distance, material and line speed. Include what a good part and a reject look like.
About this case study: the photos and camera images are the manufacturer's application test images, supplied by the maker of the tested part and taken on the parts shown; LumaSpec did not run this test. Your results depend on your part, camera and set-up. This is a manufacturer's application study, not a LumaSpec customer deployment. Reported figures are the manufacturer's; proposed components require a fresh trial. The 3D scene illustrates the arrangement and does not simulate imaging performance.