imagerie endoscope

Characterization of imaging systems and cameras

Cameras and imaging systems are used in many applications. Such uses include photography, office automation, health, transport, surveillance, defense, quality control, and sorting. These systems are made up of a whole chain of components and subsystems including images, lenses, objectives, LED lighting systems, displays and processing software.

Covering spectral bands ranging from ultraviolet to thermal infrared via the visible, these systems are increasingly efficient and complex. Imaging systems integrate state-of-the-art and rapidly evolving photonic technologies, such as imaging sensors, whose resolution and sensitivity are increasing.

They thus allow, for example, the development of less intrusive and more precise medical endoscopes. Displays are also undergoing a revolution. Definition and contrast are improving thanks to miniLEDs or microLEDs associated with cutting-edge optical techniques such as Quantum Dots. Technology is proliferating, uses are broadening and performance expectations are changing. As such, the need to characterize the performance of these systems is increasing.

PISÉO, a center of innovation and expertise in optics and photonics, offers characterization services for cameras and imaging systems for all sectors within its test laboratory.

imaging endoscope
Characterization of a medical endoscope in the PISEO laboratory

Measurements on cameras

  • Modulation Transfer Functions (MTFs)
  • Signal to Noise Ratio (SNR)
  • Field of View (FOV)
  • Geometric distortion
  • Colorimetry
  • Image Intensity Illumination for endoscopes

Measurements on lens

  • Chief Ray Angle (CRA)
  • Relative illumination or vignetting

Measurements on imaging sensors

  • SNR (Signal/Noise Ratio)
  • Dark (dark current, dark current non-uniformity, doubling-factor)
  • Fixed-Pattern-Noise and Temporal Noise (Total, row, column)
  • Full-Well saturation charge (Qsat)
  • PRNU (Photo-Response Non-Uniformity) global et local
  • PTC et EOTF (CVF, Linear saturation charge, linearity error)

Measurements on displays

  • Luminance
  • Uniformity
  • Contrast
  • Colorimetry
  • Flicker
  • Reflection

To know more about our capabilities for characterization of displays and luminous surfaces

Measurements on associated lighting devices

  • Illumination
  • Distribution of intensities
  • Uniformity
  • Colorimetry including chromatic coordinates, International Rating Certificate (IRC), Correlated Color Temperature (CCT).
  • Photobiological risk assessment

Measurements and analysis equipment

The PISEO test laboratory is equipped with all the equipment necessary to carry out the measurements mentioned above. The list below gives an overview.

  • IMATEST v22.1 image quality analysis software
  • Standard targets produced according to the International Standards Organisation (ISO) 12233 standard, or according to a specific protocol defined with our customer
  • Multispectral lighting systems uniform in luminance and standard illuminants D55, D65. Direct lighting or backlighting
  • Westboro Photonics P1230U 12 megapixel video luminance meter, lenses and Photometrika analysis software
  • Instrument Systems CAS 140D spectroradiometer
  • Radiometric bench for photobiological risk assessment

Standards and regulations

To carry out the characterizations, PISEO’s experts rely on recognized test methods and international standards. We can also use specifications such as those of the Food and Drug Administration (FDA) in the United States. They can also develop protocols and scripts in Python for carrying out specific tests. The list below presents a non-exhaustive list of standards met by our laboratory.

  • EMVA 1288: Measurement and Presentation of Specifications for Machine Vision Sensors and Cameras
  • ISO 12233: Electronic camera imaging — Resolution and spatial frequency responses
  • ISO 15739: Electronic camera imaging — Noise measurements
  • ISO 14524: Electronic cameras — Methods of measurement of opto-electronic conversion functions
  • Medical endoscopes : ISO 8600-1: 2015, ISO 8600-3: 2019, FDA article “local magnification method for quantitative evaluation of endoscope geometric distortion”
  • IEC6271 : Photobiological safety of lamps and appliances using lamps
  • EN 13032-4 : Measurement and presentation of photometric data of lamps and luminaires – Part 4 : LED lamps, modules and luminaires