MV-CS050-10GCView part & specifications →Browse camera options →Home / Case studies / Fruit colour under two source lighting conditions
Application study · Produce appearance and sortingFruit colour appearance: control the light before comparing the peel
Two real fruit comparisons show different recorded peel colours under the source natural-light and white-light conditions. They demonstrate why a colour trial needs controlled illumination and camera processing, rather than proving a grading result.
A colour threshold needs controlled capture and a defined reference.
- Proposed light housing (spec)162 × 36 × 26 mm
- EvidenceReal application-lab captures
- Camera (proposed)2448 × 2048 colour
- Field (derived proposal)84.46 × 70.66 mm derived from printed 0.1x magnification
Test stationIncluded light holdersCameraObjectiefVerlichtingPartGezichtsveld
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-CS050-10GC
Proposed 5 MP colour global-shutter camera, 2448 × 2048 pixels at 3.45 µm, C-mount. Colour processing, exposure and white balance must be controlled; the source camera is unidentified.
Proposed component
LS-KF1628M-ML
16 mm C-mount macro lens. Its printed 0.1x / 152 mm working-distance pair gives a derived 84.46 × 70.66 mm field on the proposed camera. Confirm focus, coverage and fixture clearance.
Proposed component
LS-4BRS15030-NL
Two proposed broad-spectrum natural-light bars for adjustable illumination. Each printed housing is 162 × 36 × 26 mm; exact source light is not named. The 30 mm emitting width is printed; the 150 mm illustrated strip length is schematic and proposed, not a printed light-output specification.
Proposed component
LS-BT-XZ-G-6-6045
600 mm column, 600 × 450 mm breadboard, glass tray and two lighting holders. Proposed bench fixture; actual load, travel, clamps, mounting fasteners and light clearance must be confirmed.
Inspect the real capture
Follow the contrast to the part.
A colour threshold needs controlled capture and a defined reference.
Camera and available lens CAD are published models. Light envelopes and the station base/height use printed dimensions. Part shapes, brackets, holders, shielding and spacing are illustrative; they are not reconstructions of a source part or a complete mechanically validated assembly. Light paths explain the proposed arrangement and do not simulate optical performance. The proposed field is derived from the printed camera pixel dimensions and the stated lens magnification/working-distance pair, not measured from the source capture. Specimen colours in 3D are illustrative display colours, not a calibrated colour target or a simulation of the light spectrum. The 30 mm emitting width is printed; the 150 mm illustrated strip length is schematic and proposed, not a printed light-output specification.
From the demo to your test benchCameraMV-CS050-10GCView part & specifications →Browse camera options → Imaging lens
LS-KF1628M-MLView part & specifications →Browse imaging lens options → Inspection light
LS-4BRS15030-NLView 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-CS050-10GCView part & specifications →Browse camera options →LS-KF1628M-MLView part & specifications →Browse imaging lens options →LS-4BRS15030-NLView 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
Both fruit examples change recorded colour between the two labelled lighting conditions.
What the source reports
The source provides appearance comparisons, not a measured colour difference, reference spectrum or calibrated produce-grading result.
How to use this evidence
An application-lab lighting demonstration, not a customer deployment or a qualified production inspection. Proposed camera, lens, fixture and scene spacing require a fresh trial. Source observations do not establish a defect-size limit, accuracy guarantee or production false-call rate.
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.
Source white-light conditionSource natural-light conditionSource natural-light condition: Source natural-light lemon capture, with a different recorded peel appearance.
Source white-light conditionSource natural-light conditionSource natural-light condition: Second fruit under the source natural-light condition; no grading result is implied.
The challenge
A peel-colour decision can change when lighting, white balance or exposure changes. Fruit curvature also produces highlights that may hide the useful colour region.
How it was solved
The source labels natural light and white light but does not name the exact lights, camera, exposure or white-balance settings. The proposed natural-light bars and colour camera are a separate controlled-trial setup.
The source calls one condition true colour. Without a calibrated reference and processing settings, these images support an appearance comparison rather than an objective colour-error result.
Why it works
- 1
A camera records the interaction of illumination, material reflectance and its own processing. These variables must be controlled before a colour threshold is trusted.
- 2
The supplied fruit photographs do not establish maturity, disease, variety, internal condition or a validated sorting rule.
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
Set the reference
Use the actual produce, a suitable colour reference and fixed exposure/white-balance settings.
- 02
Choose the peel region
Exclude saturated highlights and test acceptable curvature, pose and surface variation.
- 03
Validate the grading decision
If colour supports sorting, compare against independently assigned labels across representative lots and maturity ranges.
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-CS050-10GC. 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
| Source camera | Not identified in the source sheet |
|---|---|
| Camera and lens | Proposed catalog components |
| Proposed field | 84.46 × 70.66 mm derived from printed 0.1x magnification |
| Lens-to-part in proposed scene | 152 mm; printed working-distance pair |
| Mounting (proposed) | LS-BT-XZ-G-6-6045 · catalog test station with two lighting holders |
VerlichtingOur pickLS-4BRS15030-NL
Two proposed broad-spectrum natural-light bars for adjustable illumination. Each printed housing is 162 × 36 × 26 mm; exact source light is not named. The 30 mm emitting width is printed; the 150 mm illustrated strip length is schematic and proposed, not a printed light-output specification.
$369.00In proposed setup · quantity 2CameraOur pickMV-CS050-10GC
Proposed 5 MP colour global-shutter camera, 2448 × 2048 pixels at 3.45 µm, C-mount. Colour processing, exposure and white balance must be controlled; the source camera is unidentified.
$739.00In proposed setupObjectiefOur pickLS-KF1628M-ML
16 mm C-mount macro lens. Its printed 0.1x / 152 mm working-distance pair gives a derived 84.46 × 70.66 mm field on the proposed camera. Confirm focus, coverage and fixture clearance.
$319.00In proposed setupCamera test stationOur pickLS-BT-XZ-G-6-6045
600 mm column, 600 × 450 mm breadboard, glass tray and two lighting holders. Proposed bench fixture; actual load, travel, clamps, mounting fasteners and light clearance must be confirmed.
$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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