823 Video Photometer

  • Performs statistical process operations over user-defined regions of interest
  • 8 or 10 bit digital system
  • Lamp and LED, backlit panel, and control switch performance
  • Can be customized to measure your product’s appearance characteristics

Measure Absolute Brightness

The Model 823 Video Photometer measures the absolute brightness of any size sample or scene and pro-vides quantitative data in fL or cd/m2. The 823 employs a progressive scan non-interlaced USB 2.0 camera to measure the performance of lamps, LEDs, backlit panels, control switches, etc. It also quantifies paint reflectance, hemi-spherical reflectance, micropitting, mirror reflective haze, contrast, and other appearance characteristics. The 823 generates a 1024 x 768-pixel image with a digitized 10 bit gray scale. It uses TRICOR’s Windows® compatible PC-based software system, to provide analysis tools used to establish photometric levels for an image. A user-friendly Windows® interface offers many menu options for analyzing the acquired gray scale image; however, the real potential of Eyeppearance+™ is realized when a calibration transform file is loaded for the image. The calibration transform translates the relative gray levels into absolute radiometric levels. Pixel radiance levels and histogram distributions are given in photopic units. Menu options, such as the Enhance option, provide a close coupling of the image data and the histogram distribution. The image is highlighted in green for a given section of the histogram. The user can use the mouse to quickly change the highlighted radiance levels in bandwidth and position on the histogram distribution. Also, false coloring can be applied to the image allowing the user to readily see those areas below, above, and within the user- specified tolerance band. Quantitative values associated with the highlighted area(s) are then displayed on the PC screen. Another powerful feature of Eyeppearance+™ is its ability to define up to 254 regions of interest. Each region of interest may be any region as outlined by the user using the mouse. From this region an active subset can be selected, which establishes a new histogram distribution and limits image analysis to this active region only.

Applications include:

  • Lamps, LEDs, Backlit Panels, Displays, and EL performance measurements
  • Paint reflectance measurements
  • Haze measurements
  • Contrast Measurements
  • General appearance quantification
  • Can be customized to measure your product’s appearance characteristics
Type CCD Progressive Scan USB 2.0 video photometer with 16 user-selectable shutter speeds
Receptor Silicon CCD filtered to closely match the CIE relative photopic luminosity response
Calibration System supplied with one set of calibration curves (one curve for each of the 16 shutter speeds at one lens f/stop)
Measurement Scales
  • Absolute luminance scale (fL or cd/m2)
  • Digital: 10-bit image scale (1024 gray levels)
Analysis Capabilities (partial listing)
  • Pixel interrogation and Contrast Calculation
  • CCF (Color Correction Factor)
  • Real-time false coloring
  • ROI (Region of Interest) selection.
Optical System 35-mm, f/1.6 lens standard (other lenses available).
Field of View 7.9° H x 5.9° standard lens (typical)
Focusing Distance .3 m (1 ft) to infinity with standard lens and configuration
Target Area
  • Minimum: as small as 1 image pixel is dependent upon measuring distance and field of view of lens and configuration
Luminance Units cd/m2 or fL selectable; calibration values in memory automatically converted for user display
Measurement Ranges
  • .01 to 999,999 fL; .034 to 999,999 cd/m2 (configuration dependent)
  • Accuracy ±4% of measured value (Measuring conditions: subject: standard illuminant A; ambient temperature: 20° to 30° C (68° to 86° F)
Short-term Repeatability ±0.4% (Measuring subject: standard illuminant A)
Resultant Image 1024 x 768 x 10 bits resolution
Pixel size 4.65 x 4.65 microns
Temperature Ranges
  • Operating: -5° to 45° C (23° to 109° F); relative humidity less than 85% at 32° C (90° F)
  • Storage: -30° to 66° C (-19° to 134° F); with no condensation cd/m2 to infinity

Typical Applications

  • Appearance
  • Backlit panels characteristics
  • Control switches
  • Cluster appliqués
  • Instrument panels
  • Lamps
  • LED’s
  • Haze
  • Micropitting
  • Reflectance
  • Transmission
  • Contrast
  • EL
  • Displays
  • Uniformity

Hardware Requirements

  • Personal Computer: Win 7, Win 10
    • Windows™ OS (consult factory for latest version)
    • USB 2.0 port (for camera)
    • Minimum display resolution 1680 x 1050
    • USB port (for optional locator SW only)
    • CD Reader
    • 1.00+ GB RAM

System Components

  • CCD Camera: 28 H x 28 W x 43 L mm (1.1 H x 1.1 W x 1.7 L inches) 45g (1.6 oz)
  • Lens: 35-mm, f/1.3
  • Cables: 3.0 m long USB 2.0 A-Mini B
  • Photopic Filter with one set of calibration curves
  • Tabletop Tripod
  • Eyeppearance® Software
  • Reference Manual


  • Additional Lenses
  • Custom Chamber
  • Custom Software
  • Additional Calibration Curves
  • Personal Computer