Vision sensor for measuring contrasts and method for making such measure

摘要

A digital vision sensor includes a pixel array (10) for receiving a light beam representing a visual scene. The sensor includes: a reference voltage Vref generator; in each pixel, an element for generating, during an integration phase, a voltage Vp that is proportional to the received lighting and a comparator (30) for determining the moment when the voltage Vp thereof reaches the reference voltage; a logarithmic period generator for generating a clock having a period that increases proportionally to the time elapsed from the beginning of the integration; a device for counting the number of clock periods elapsed from the beginning of the integration and providing a result in the form of a binary code; a static RAM memory word (50) per pixel; and, in each pixel, an element (40) for writing the code present at the moment into the memory.