Motor vehicles or indicators e.g. number plate, recognition method, involves controlling light exposure in global shutter-mode to simultaneously expose all pixels of image sensor and selecting light energy that remains in permissible limit

摘要

The method involves evaluating detected images of vehicles or indicators e.g. number plate (1), and controlling light exposure in a global shutter-mode to simultaneously expose all pixels of an image sensor (6) i.e. complementary MOS sensor. The vehicles or indicators are illuminated with an infrared-light flash for a period in a range of microseconds. A rest period upto next flash is provided in a range of milliseconds. Light energy emitted in a time period formed from flash and rest periods is selected such that the energy remains in a range of permissible limit of ophthalmic compatibility. An independent claim is also included for a traffic monitoring system for executing a method for automatic recognition of motor vehicles or indicators.