FIELD: imaging.
SUBSTANCE: method includes a discrete representation of the input target image, calculating a piecewise linear representation of the light-redirecting surface of the caustic layer by means of intersecting surface pieces. For a given set of vertex heights of the surface pieces, the corresponding set of light intensities that are focused by the caustic layer is calculated, and the vertex heights of the corresponding surface pieces that minimize the differences between the values of the calculated light intensities and the corresponding values of the target light intensities are calculated, a refractive transparent, or a partially transparent, or reflective light redirecting surface of the caustic layer having a relief pattern for redirecting incident light from the light source and for forming an image containing the caustic pattern is obtained.
EFFECT: creation of a fast, scalable, reliable and accurate manufacturing method and the possibility of visual object authentication using publicly available tools.
13 cl, 8 dwg
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