Noctvision - Machine vision and edge AI notes — optics, lighting, algorithms, edge inference

How Strongly Cross-Polarization Suppresses Glare Depends on the Lighting Angle

Cross-polarization presses nickel-pin highlights to 1/500 under coaxial light, but polarization leaks on curved pins under a 15° ring and suppression stops at 1/36.5. The price is 2.5 stops of…

2026-09-02

Lighting Design, Optics

An 850 nm Band-Pass Filter Erases Factory Lights but Leaves Sunlight

An 850 nm band-pass filter erases factory LED light but keeps sunlight. What remains shrinks by the overdrive factor, not by the shorter exposure: a 40-level swing drops to 2…

2026-09-23

Vision Algorithm

Building a Vision Inspection App with PySide6 and OpenCV

In a 220-line PySide6 and OpenCV inspection UI, a 3 px size filter and a 25-level threshold set the detection floor together. Without bytesPerLine a 1,021 px wide image turns…

2026-09-25

Lighting Design

Six Machine-Vision Lighting Methods and How to Choose

Noctvision / 2026-08-05 / 0 Comments

On a flat gold pad the camera records the mirror image of the light: a 30 mm ring at lens height reflects only on a 15 mm circle, and an 80 mm coaxial…

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