The Model 823 Video Photometer measures the absolute brightness of any size sample or scene and provides quantitative data in fL or cd/m2. The 823 employs a progressive scan non-interlaced IEEE 1394 "Firewire" camera to measure the performance of lamps, LEDs, backlit panels, control switches, etc. It also quantifies paint reflectance, hemi-spherical reflectance, micro pitting, mirror reflective haze, contrast, and other appearance characteristics.
The 823 generates a 1024 x 768 pixel image with a digitized 8 or 10 bit gray scale. It uses TRICOR's Eyeppearance® software, a 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.Some Typical Applications include:
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 bimage 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.
|Type||CCD Progressive Scan IEEE 1394 "Firewire" 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).|
|Analysis Capabilities (partial listing)||
|Optical System||50-mm, f/1.3 lens standard (other lenses available).|
|Field of View||7° 12'H x 5° 24'V with standard lens.|
|Focusing Distance||1 m (3.3 ft) to infinity with standard lens and configuration.|
|Luminance Units||cd/m2 or fL selectable; calibration values in memory automatically converted for user display.|
|Short-term Repeatability||±0.4% (Measuring subject: standard illuminant A)|
|Resultant Image||1024 x 768 x 8 bits resolution;1024 x 768 x 10 bits resolution|
|Pixel size||14 x 14 microns|
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