Measuring ANPR System Performance
A 2008 article in Parking Trend International discussed a disparity in claimed vs. experienced license plate recognition read rates, with manufacturers claiming that their recognition engines can correctly report 98% of the time, although customers experience only 90% to 94% success, even with new equipment under perfect conditions. Early systems were reportedly only 60% to 80% reliable. True system error rate is the product of its subsystem error rates (image capture, license plate image extraction, LP image interpretation); slight increases in subsystem error rates can produce dramatic reductions of read rates. The effects of real-world interfering factors on read rate are not uniformly specified or tested by manufacturers. The article states "there is a need for the industry to adopt a standard performance measurement protocol to enable potential customers assess the best fit for their particular requirements."
Read more about this topic: Automatic Number Plate Recognition
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