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TechNote: ProMetric High Dynamic Range (HDR) Mode

ProMetric HDR Mode


A new “multi-exposure” feature (also known as “HDR” or High Dynamic Range mode) has been added by Radiant Vision Systems for their ProMetric family of CCD-based imaging photometers and colorimeters.

The new HDR mode increases the dynamic range of the ProMetric camera significantly (up to 1,000,000:1). The newly developed algorithm achieves this range extension by combining separate images with different exposure times. This method increases the grey scale range of the image while at the same time lowering the noise level. The accuracy of the measured luminance and colour remains very high, with a percentage error of +/- 3% for luminance (cd/m²) and colour coordinates x,y of +/- 0.003.

The multi-exposure HDR feature allows for a more accurate luminance analysis of a device under test which features simultaneously both low and bright illumination levels. A good example of an application which benefits from the HDR mode is the measurement of emergency signs when looking simultaneously at the sign and at the light pattern on the wall. Other examples are street lights and their pattern on the street or on the pavement, where the HDR mode allows for the measurement of the illumination pattern as well as the light emitted directly from the lamp.

ProMetric Imaging Colorimeter  

 


 

 

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