Patent ID: 7570373

Claim:
A measuring device for measuring a spatial distribution of at least one parameter of a sheet-like object, comprising: a parameter measuring unit for measuring a parameter at least at a point A and a point B on an object surface, a coordinate measuring unit for measuring a coordinate at least at the point B relative to the point A on the object surface, the coordinate measuring unit being connected to a digital signal processing unit, the coordinate measuring, unit performing the coordinate measuring by determining a correlation between a first image of a spot around the point A at a time T 1 and a second image of a spot around the point B at a time T 2 , the first and the second images being taken by a digital camera, a synchronization unit connected to the parameter measurement unit and to the coordinate measuring unit, the synchronization unit adapted to turn on the coordinate measuring unit simultaneously with the parameter measuring unit; moving platform to perform a displacement of at least the parameter measuring unit and the coordinate measuring unit together in any direction within the object surface, wherein the displacement consists of steps, a length of each step being smaller than a length of the spot around the point A in a direction of the displacement.