Patent ID: 7420148

Claim:
A method for determining a pixel gray scale value image, particularly for a multi-dimensional image system, in which a first modulation signal (M 1 ) which is emitted at the emitting end and is reflected on an object that is to be recorded is correlated with a second modulation signal (M 2 ) and is recorded at the receiving end based on at least two correlation signals (Ua, Ub or Ia, Ib) that are proportional to the respective received first modulation signal (M 1 ), wherein one of the modulation signals (M 1 , M 2 ) is phase shifted in at least four phase steps (ψk) at the emitting or receiving end and wherein for each phase step (ψk) based on the correlation signals (Ua, Ub or Ia, Ib,) a differential signal (D) is determined and based on said differential signal (D) a pixel gray scale value (P Gray ) is determined independently of interfering signals, wherein the pixel gray scale value (P Gray ) is determined based on the complex function of the differential signal (D) as per | z|=P Gray =√{square root over ((Δ Re ) 2 +(Δ Im ) 2 )}{square root over ((Δ Re ) 2 +(Δ Im ) 2 )}.