Geometric plane shapes for computer generated holographic engraving codes

H. RABAL; R. SANCHEZ; A. AUGIER

OPTICS COMMUNICATIONS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2016 vol. 389 p. 212 - 223

0030-4018

We report a new theoretical and experimental study on hologravures, as holographic computer-generated laserengravings.A geometric theory of images based on the general principles of light ray behaviour is shown. Themodels used are also applicable for similar engravings obtained by any non-laser method, and the solutionsallow for the analysis of particular situations, not only in the case of light reflection mode, but also intransmission mode geometry. This approach is a novel perspective allowing the three-dimensional (3D) designof engraved images for specific ends. We prove theoretically that plane curves of very general geometric shapescan be used to encode image information onto a two-dimensional (2D) engraving, showing notable influence onthe behaviour of reconstructed images that appears as an exciting investigation topic, extending its applications.Several cases of code using particular curvilinear shapes are experimentally studied. The computer-generatedobjects are coded by using the chosen curve type, and engraved by a laser on a plane surface of suitable material.All images are recovered optically by adequate illumination. The pseudoscopic or orthoscopic character of theseimages is considered, and an appropriate interpretation is presented.