MV-CS050-10GM(NPOE)View part & specifications →Browse camera options →Home / Case studies / Screen-film creases and local deformation
Application study · Display and optical filmsFinding 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.
- Test lightLS-2LFM100, white
- SignalLocal stripe deformation
- Emitting area (spec)100 × 100 mm
- MethodReflected-pattern inspection
Test stationIncluded light holdersCameraLensLightPartField of view
Drag to rotate · scroll to zoomWalk through this setup 5 guided stops
From component to inspection
Understand each choice.
Choose a stop to frame the part in 3D and see why it belongs in this setup. The component notes and links remain available if 3D cannot load.
Proposed component
MV-CS050-10GM(NPOE)
5 MP monochrome area-scan camera; a starting point for a contrast trial. Confirm sampling against your smallest defect.
Proposed component
LS-KF1628M-ML
16 mm C-mount macro lens, 0.25x to 0.03x magnification. Confirm field of view and working distance on your part.
Tested component
LS-2LFM100
White striped light identified in the screen-film crease test; use a local inspection window or verify coverage for larger films.
Proposed component
LS-BT-XZ-G-6-6045
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.
Inspect the real capture
Follow the contrast to the part.
Inspect the change in reflection, not just the film colour.
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.
From the demo to your test benchCameraMV-CS050-10GM(NPOE)View part & specifications →Browse camera options → Imaging lens
LS-KF1628M-MLView part & specifications →Browse imaging lens options → Inspection light
LS-2LFM100View part & specifications →Browse inspection light options → Test station & mounts
LS-BT-XZ-G-6-6045View part & specifications →Browse test station & mounts options →
Build around the parts you can buy.
Explore each component, check its specifications and compare alternatives. The proposed quote includes the linked test station; its catalog listing includes two lighting holders.
MV-CS050-10GM(NPOE)View part & specifications →Browse camera options →LS-KF1628M-MLView part & specifications →Browse imaging lens options →LS-2LFM100View part & specifications →Browse inspection light options →LS-BT-XZ-G-6-6045View part & specifications →Browse test station & mounts options →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.
Configure the mounting station →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.
Lighting application-lab image sheet
Evidence you can inspect
Visible in the images
The test image shows distorted reflected stripes at the marked crease.
What the source reports
The source identifies the white LS-2LFM100; no measurement or detection rate is supplied.
How to use this evidence
This is a contrast demonstration, not a calibrated 3D surface scan.
What the camera saw
Cropped from the source test sheet; original test annotations are retained. Captures are not generated or enhanced. Drag the comparison slider or use the image buttons.
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-2LFM100 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.
From image contrast to a production decision
What to validate on your part
A useful sample image is the starting point. These are the checks that turn the concept into a defensible inspection.
- 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.
Explore your inspection requirementsNo limit from motion
How many pixels cover your feature?
Compare feature coverage, camera pixel requirements and exposure using your own planning inputs. These are calculated planning values, not inspection results or an accuracy specification.
Editable planning scenario. Adjust these example inputs for your application; they are separate from the source test and 3D setup. Motion allowance and target coverage are starting points to validate, not acceptance limits. Pixel count starts from the proposed camera's catalog resolution.
Enter finite numbers in every field. Field width, feature width, target coverage, exposure and allowed motion must be greater than zero; horizontal pixel count must be a positive whole number; material speed may be zero. Use values within the supported numeric range if a calculation cannot be represented.
Object sampling mm/px
Pixels across feature px
Horizontal pixels for target px
Motion during exposure px
Exposure ceiling from motion µs
Formulas and assumptions
The field, feature, speed and exposure start with neutral example values. They are not taken from the source test or the 3D illustration. Allowed motion starts at an editable 0.5-pixel example; it is not a recommended acceptance limit. Target coverage starts at an editable 5-pixel example; it is not a recommended detection or measurement threshold. The horizontal pixel count starts from the catalog Resolution row for MV-CS050-10GM(NPOE). Use the effective width after cropping, binning or decimation if those modes are enabled.
- Object sampling (mm/px) = field width (mm) / horizontal pixels.
- Pixels across feature = feature width (mm) / object sampling (mm/px).
- Horizontal pixels for target = field width (mm) × target pixels across feature / feature width (mm), rounded up to a whole pixel.
- Motion (px) = speed (mm/s) × exposure (µs) / 1,000,000 / object sampling (mm/px).
- Exposure for allowed motion (µs) = allowed motion (px) × object sampling (mm/px) / speed (mm/s) × 1,000,000.
The exposure result is the maximum duration from this motion allowance alone. At zero speed, motion sets no exposure limit; the camera, lighting, saturation and other constraints still apply. A shorter exposure does not itself guarantee a reliable inspection.
Field width and feature width refer to the same object plane. The motion calculation assumes uniform linear motion parallel to the field-width direction and a single exposure. It does not model perspective, vibration, rolling-shutter distortion, diffraction, defocus or optical distortion. A strobe may change the effective exposure.
The target result is a horizontal sampling requirement, not a camera recommendation or a change to the selected camera. It uses the effective image width after cropping, binning or decimation and does not determine the vertical resolution or sensor size. Pixel coverage alone does not establish detectability or measurement accuracy. Validate contrast, lens performance, working distance, illumination, calibration, camera exposure limits and the inspection algorithm on representative parts. Changing field width does not change the 3D model or certify that the proposed lens can achieve that field.
The set-up and the parts
| Test light | LS-2LFM100, 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-BT-XZ-G-6-6045 · camera test station with glass tray and two lighting holders |
LightTestedLS-2LFM100
White striped light identified in the screen-film crease test; use a local inspection window or verify coverage for larger films.
$329.00In proposed setupCameraOur pickMV-CS050-10GM(NPOE)
5 MP monochrome area-scan camera; a starting point for a contrast trial. Confirm sampling against your smallest defect.
$819.00In proposed setupLensOur pickLS-KF1628M-ML
16 mm C-mount macro lens, 0.25x to 0.03x magnification. Confirm field of view and working distance on your part.
$319.00In proposed setupCamera test stationOur pickLS-BT-XZ-G-6-6045
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.
$359.00In proposed setup"Tested" identifies the part named in the source. "Our pick" is a proposed alternative or supporting part. The quote includes only cards marked "In proposed setup", with the quantities shown; other test arrangements are separate. Confirm colour, optics, controllers, power supplies, cables and mounting before ordering.
About this case study: the photos and camera images come from the application laboratory of the maker of the lighting and optics we sell, imaged on the parts shown; your results depend on your part, camera and set-up. This is an application-lab study, not a LumaSpec customer deployment. Source figures are reported results; proposed components require a fresh trial. The 3D scene illustrates the arrangement and does not simulate imaging performance.
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Start with your inspection requirement
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.
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