Random phase images generated by affine transformations as optical coding masks

FABIÁN MOSSO; MYRIAN TEBALDI; ROBERTO TORROBA; NÉSTOR BOLOGNINI

Sydney, Australia

Congreso; ICO 21 – 2008 Congress Optics for the 21st Century; 2008

ICO

In this contribution we present algorithms to generate a pseudo-random pattern of an input image trough an affine transformation. The basic parameters affine transformation uses are: scaling, rotation and translation. In this proposal we also include shearing procedures. The advantages and disadvantages of using these new parameters are discussed. the properties of the random patterns obtained by usnig affine transformations are not still well stablished. We center our interest  that the afine transformations parameters have on the random properties observed in the final transformed image. The number of iterations needed to reach a random code was studied. Potential uses in optical securiry schemes are explored.