Handheld laser-based vehicle speed measurement device incorporating an automatic number plate recognition (ANPR) function
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United States of America Patent
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May 30, 2023
Grant Date -
May 21, 2020
app pub date -
Nov 19, 2019
filing date -
Nov 20, 2018
priority date (Note) -
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Abstract
Disclosed herein is a handheld speed gun incorporating automatic number plate recognition (ANPR) functionality. As the image size of a vehicle license plate varies depending on its distance from the speed gun, in the present invention the distance to the target vehicle is known through the functionality of the laser sensor so the size of the pixels for the number plate can be estimated. Since the image of the number plate may be tilted in a handheld device, the present invention compensates for this by use of the instrument's tilt sensor or through other compensation by use of the image itself.
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