Uniformity measurements indicate an imaging system’s tendency to become darker away from the centre of the image. This is due to the radial nature of the lens which collects more light in the centre. It can be particularly strong with wide angle lenses. Testing for uniformity requires a flat-field test, or uniform light source.
In order to minimise cosine falloff in imaging systems with wider field of view lenses, it is important to have a light source that produces uniform illumination across the entire field of view.
We also provide uniform reflectance targets for use with external light sources.
You may also be interested in our blog article on Image Quality Testing and Image Sensor Calibration.
The Imatest LED Lightbox is a highly uniform light source with 95% uniformity, designed for dynamic range and ultra-high resolution testing. Choose from a continuous range of light levels between 30 to 10,000 lux.
The Imatest LED Lightbox produces uniform light with excellent spectral characteristics that can be adjusted over a wide range of brightness for illuminating transparency test charts. The uniformity, adjustability, and high colour quality make it superior lighting to other LED or fluorescent systems we’ve seen.
The Imatest LED Lightboxes Range:
Imatest LED Lightbox – Multi-Channel Visible Light
The Imatest LED Lightbox produces uniform light with excellent spectral characteristics that can be adjusted over a wide range of brightness for illuminating transparency test charts.
Imatest LED Lightbox – Multi-Channel NIR Options
The Imatest LED Light Panel provides a versatile, low profile and lightweight light source with 90% uniformity, dimmability, wireless controls and easy integration with our hardware and charts. Choose from a variety of color temperatures as well as near-infrared channels with illuminance levels ranging from 100 to 1,000 lux. It is ideal for testing many image quality factors with a range of transmissive test charts. Compatible with the Lighting Control feature (Imatest Version 2020.1), connecting with WiFi or USB.
Description
Imatest light panels are offered in seven sizes with:
| KU | Sizes | Diffuser Panel Size/ External Dimensions | Intensity (min to max)* | Light Temperature Options** | Uniformity | Channels |
| ILP-A | A | 229mm x 152mm (9″ x 6″) 299mm x 222mm x 40 mm (11.8” x 8.7” x 1.6”) | 100 ~ 1,000 lux NIR = 2 ~ 20 W/m2 | 3100K 4100K 5100K 6500K NIR 850nm NIR 940nm | 90% | Single |
| ILP-B | B | 260mm x 220mm (10.24″ x 8.66″) 384mm x 334mm x 60mm (15.1” x 13.1” x 2.4”) | ||||
| ILP-C | C | 432mm x 305mm (17″ x 12″) 512mm x 385mm x 60mm (20.2” x 15.2” x 2.4”) | ||||
| ILP-D | D | 610mm x 432mm (24″ x 17″) 690mm x 512mm x 60mm (27.2” x 20.2” x 2.4”) | ||||
| ILP-E | E | 907mm x 540mm (35.7″ x 21.3″) 987mm x 620mm x 70mm (38.9” x 24.4” x 2.8”) | 90% | |||
| ILP-F | F | 907mm x 680mm (35.7″ x 26.8″) 987mm x 760mm x 70mm (38.9” x 29.9” x 2.8”) | ||||
| ILP-G | G | 1225mm x 680mm (48.2″ x 26.8″) 1305mm x 760mm x 70mm (51.4” x 29.9” x 2.8”) |
The LB3 spherical light source for testing up to 230 deg FoV camera systems. For testing Lens Shading, Color Shading, AE, Blemishes, OTP, etc.
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