Patent ID: 7939789
Filing Date: 2011-05-10
Classification: H04N

Abstract:
1. A method for reproducibly determining object characteristics, comprising: imaging an object onto a detector using imaging optics and detecting the object thereon; determining a correction function k by positioning a filter in the beam path in front of the detector to determine a defined change to the brightness I impinging on the detector; and applying the correction function k to a brightness measuring result N originally detected by the detector, such, that a corrected brightness measuring result N′ is proportional to a brightness I impinging on the detector; wherein the detector includes a plurality of detector elements; wherein a shading correction is carried out on the individual detector elements; wherein a common non-linearity correction function {tilde over (ƒ)}(N) is applied to all of the detector elements, wherein all the detector elements are corrected individually by subtraction of the black value (b