머신 비전, 자동차 및 산업용 카메라를 위한 카메라 화질 테스트

MTF (Modulation Transfer Function) testing quantifies how well a lens or camera system reproduces contrast at different spatial frequencies. Higher MTF at a given spatial frequency and field position means better contrast reproduction of that detail; comparing sharpness requires the full MTF curve across the field. For machine vision and automotive ADAS applications, MTF directly correlates to the system's ability to resolve small features, read barcodes, or detect objects at distance. We measure lens MTF on our Trioptics HR2 bench and complete camera systems using the slanted-edge (eSFR) method per ISO 12233, providing data at multiple field positions from center to corner, under photopic and 850nm NIR illumination.

MTF testing typically refers to lens-only measurements using specialized optical equipment like our Trioptics HR2, where the lens is tested in isolation without a sensor. eSFR (edge Spatial Frequency Response) testing per ISO 12233:2017 measures the complete camera system including lens, sensor, and image processing. Both produce MTF-equivalent data, but eSFR captures real-world system performance including sensor sampling effects, ISP sharpening, and noise reduction impacts on resolution.

We measure color accuracy using X-Rite ColorChecker charts and calculate Delta E (ΔE) using the CIEDE2000 formula in CIE Lab color space. A ΔE of 1.0 is considered imperceptible to most observers, while ΔE < 3.0 is typically acceptable for consumer applications. For machine vision color sorting or medical imaging, tighter tolerances (ΔE < 1.5) may be required. We test under multiple illuminants (D65, A, TL84) to characterize AWB performance across lighting conditions.

미광은 렌즈 표면 간의 원치 않는 반사, 센서에서 렌즈를 통해 다시 반사되는 빛, 그리고 광학 코팅이나 렌즈 배럴 표면에서의 산란으로 인해 발생합니다. 특히 고스트 현상은 밝은 광원이 2차 반사를 일으켜 센서 위에 초점이 맞거나 반쯤 초점이 맞은 이미지가 형성될 때 발생합니다. 자동차용 카메라의 경우, 하루 중 태양의 각도에 따라 보행자나 도로 표지판을 가리는 고스트 현상이 발생할 수 있으므로 이는 매우 중요한 문제입니다. 당사는 ISO 9358에 따라 베일링 글레어(명암비 저하)와 개별 고스트 위치를 모두 특성 분석합니다.

Yes, for surveillance, driver monitoring, and night vision applications, we provide complete image quality characterization at 850nm and 940nm wavelengths. This includes MTF/resolution testing, dynamic range measurement, and sensitivity evaluation under NIR illumination. Many cameras optimized for visible light perform differently at NIR due to lens chromatic focus shift and sensor spectral response variations. NIR testing is essential for systems that must operate in both day and night conditions.

Sample quantities depend on your test plan and statistical requirements. For development testing, 3–5 samples per test condition is typical. For qualification to automotive or military standards, sample sizes are specified by the applicable standard. We can advise on sample planning during the requirements review phase. Keep in mind that image quality testing is generally non-destructive, so samples can be returned after testing for further use.