For the last several years, low-cost cameras have been used in a variety of applications such as surveillance, cell phones, and automotive. While reducing costs provides significant benefits to the general consumer, it can also increase the risk of performance declining, especially once stray light enters the camera's lens. A simple and quick check will ensure quality control of these cameras. The Veiling Glare Index Test is a measurement of the image obscuring light scatter in a lens system done by determining the contrast between black and white target areas. EOI has made available the VGI test in a small, affordable platform with VGI-150 and will drive the consistency and higher performance of the low-cost cameras we are increasingly reliant on for backing up our cars and taking selfies with our phones.
Requiring only 12.5% of the volume to perform Veiling Glare Index measurements per ISO 9358 compared with the large spheres described in the standard, VGI-150's small footprint makes possible an easy deployment on a production line and a lower cost overall. The innovative new design has additional benefits of 180° orientation of the off-axis glancing light angles and adjustable light levels with continuous monitoring of the black and white targets so the contrast level is a known ratio at the time the measurements are made.
The VGI-150 also provides a high contrast (>1000:1) controlled black target surrounded by white light entering the lens at glancing angles. The VGI-150 Test System is an innovative, unique design utilizing a sphere within a sphere to keep the overall size to less than 0.5 m diameters. There are two detectors, one to measure the dark target sphere and one for the white light level in the outer sphere (up to 20,000 ft.L). X-Y and Azimuth stages are included for the camera system to be adjusted for incoming glancing angles.
The VGI-150 utilizes the same proven lamp power supplies and feedback detectors as EOI’s highly stable (±0.2%) Integrating Sphere product line.
- Small footprint for lower overall cost and easy deployment
- Image capture hardware and software available
- EOI software processes images per ISO standard 9358