Automatic Number Plate Recognition (ANPR) Calculator

Use this calculator to determine if a number plate can be recognised over a given distance with a given lens.

For a number plate to be recognised an individual character MUST be a minimum of 20 pixels high in the captured image.

Distance to number plate (m)

Distance off the line of travel (m)

Height of camera (m)

Number plate font height (mm)

Lens option

Digital zoom

Ideally the recognition will be done with a resolution of 800x600 to minimise bandwidth and storage requirements.

Digital zoom should only be used to a maximum of 1.6x. The number plate is assumed to be 1m off the ground.