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Light Boxes Illuminate Backlit Charts: Measure Sensor Response and Blemishes

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 fall-off 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. 

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Imatest LED Light BoxesLED Lightboxes

Datasheet

The Imatest LED Light Box 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 Light Box produces uniform luminance 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 Light Box Range

Imatest LED High Lux Light Box

  • This light box has two visible light channels (3100K and 6500K) with mixed mode and 95% uniformity.
  • It is available in our size B which has display panel dimensions of 260 x 220mm (10.24″ x 8.66″).
  • Automatic control is available through Wi-Fi or USB.

Imatest LED Light Box – Multi-Channel Visible Light

This Imatest LED light box produces uniform light with excellent spectral characteristics that can be adjusted over a wide range of brightness levels for illuminating transparency test charts.

  • Two standard sizes.
  • Two visible channels: 3100K and 6500K with mixed mode to accommodate a range of colour temperatures. NIR lighting options are also available.
  • 30 ~ 10,000 lux (size B is also available in High Lux version with 30 ~ 100,000 lux).
  • 95% uniformity on Size B and 93% uniformity on Size C.
  • Compatible with the lighting control feature (Imatest version 2020.1), connecting with Wi-Fi or USB.

Imatest LED Light Box – Multi-Channel NIR Options

  • Two standard sizes.
  • Two channels with mixed mode (one VIS & one NIR or two NIR). Visible light only options are also available.
  • Visible 30 ~ 10,000 lux and NIR 2 ~ 20 W/m2.
  • 95% uniformity on size B and 93% uniformity on size C in visible spectrum. 90% uniformity in NIR.
  • Compatible with the lighting control feature (Imatest Version 2020.1), connecting with Wi-Fi or USB.

Ultra-High Illumination Flickering Lightbox

LED Lightboxes

Datasheet

The Imatest LED Lightbox ILB-B-150K produces uniform light with excellent spectral characteristics that can be adjusted over a wide range of brightness for illuminating transparency test charts.

  • Single visible channels: 5100K color temperatures.
  • Luminance of 10 to 47,700 cd/m2  (30 to 150,000 lux)
  • Flickering option for IEEE P2020 testing of camera LED Flicker Mitigation (LFM)
  • 95% uniformity (for 260 x 220mm test charts)

 

This lightbox is brighter than outdoor direct sunlight and  superior lighting to other LED or fluorescent systems. A wireless communication module is optionally available.

Description

SizeB (260mm x 220mm)
Diffuser Panel Size300mm x 280mm (11.8″ x 11.0″)
External Dimensions440mm x 415mm x 158.8mm (17.3″ x 16.3″  x 6.25″)
Intensity 10 to 47,700 cd/m2  (30 to 150,000 lux)
Color Temperature5100K ±300K
Uniformity95%(260 x 220mm) / 90%(300 x280mm)
Flicker frequency10 ~ 65000 Hz
Flicker duty cycle0 ~ 100%
ControlManual / USB / Wireless (optional)
Power750W

Imatest LED Light PanelLED Lightboxes

Datasheet

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 colour 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 Wi-Fi or USB.

Description

Imatest light panels are offered in seven sizes with:

  • Chart alignment rails to align the charts for the most reliable results.
  • A single channel with your choice of various colour temperatures (+/- 200K) or NIR options.
  • Illuminance level 100 ~ 1,000 lux.
  • 90% uniformity.
KU Sizes  Diffuser Panel Size/
 External Dimensions

 Intensity 

 (min to max)*

 Light Temperature

 Options**

 Uniformity Channels
ILP-A    A229mm 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    B260mm x 220mm (10.24″ x 8.66″) 
384mm x 334mm x 60mm (15.1” x 13.1” x 2.4”)
ILP-C    C432mm x 305mm (17″ x 12″)
512mm x 385mm x 60mm (20.2” x 15.2” x 2.4”)
ILP-D    D610mm x 432mm (24″ x 17″)
690mm x 512mm x 60mm (27.2” x 20.2” x 2.4”)
ILP-E    E907mm x 540mm (35.7″ x 21.3″)
987mm x 620mm x 70mm (38.9” x 24.4” x 2.8”)		 90% 
ILP-F    F907mm x 680mm (35.7″ x 26.8″)
987mm x 760mm x 70mm (38.9” x 29.9” x 2.8”)
ILP-G    G1225mm x 680mm (48.2″ x 26.8″)
1305mm x 760mm x 70mm (51.4” x 29.9” x 2.8”)
 

Imatest 230° Hemispherical Uniform Lighting SystemLED Lightboxes

Datasheet

The LB3 spherical light source for testing up to 230 deg FOV camera systems. For testing lens shading, colour shading, AE, blemishes, OTP, etc.

  • Diameter 200 or 500mm, open aperture 90 or 250mm.
  • Visible adjustable colour temperature range: 2300-6500K.
  • Optional IR range: 850nm + 940nm.
  • Optional camera holder.

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