{"id":1215,"date":"2017-05-15T16:11:53","date_gmt":"2017-05-15T14:11:53","guid":{"rendered":"http:\/\/asuralpr.com\/?p=1215"},"modified":"2017-05-15T16:11:53","modified_gmt":"2017-05-15T14:11:53","slug":"triggering-maximum-hitrate","status":"publish","type":"post","link":"https:\/\/asuratechnologies.com\/de\/2017\/05\/15\/triggering-maximum-hitrate\/","title":{"rendered":"Triggering for maximum hitrate"},"content":{"rendered":"

When building an automatized system, no matter for what purpose, the first step according to my approach is optimizing the quality of the input, and trying to minimize the number of challenging situations (or events) as much as possible. The equation is easy: optimum input quality for optimal performance; but what are the implications in case of LPR? The answer depends on the intended purpose of your system. What is the critical success factor of the system? Is it hitrate, maximum accuracy, or maximum processing speed? In the second post of the current series I\u2019ll concentrate on hitrate as the key factor of success.<\/strong><\/p>\n

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First of all let\u2019s clarify the concept of hitrate; it is the number of registered vehicles \/ number of total vehicles that passed the checkpoint. Don\u2019t forget that in this case a \u201cregistered vehicle\u201d doesn\u2019t necessarily mean a vehicle with correctly recognized license plate.<\/p>\n

For maximum hitrate<\/strong>, you must focus on catching every single vehicle passing by and generating an event out of each. It is imperative that the system is able to store exactly one event per vehicle. The most reliable method is using a hardware device that can detect the presence of a vehicle and can differentiate two different vehicles even if they are tailgating. Such a device is commonly referred to as a trigger device. A trigger device can be anything that detects the event. Let\u2019s see some examples:<\/p>\n