Three-dimensional surface contouring of macroscopic objects by means of phase-difference images

We report a technique to determine the 3D contour of objects with dimensions of at least 4 orders of magnitude larger than the illumination optical wavelength. Our proposal is based on the numerical reconstruction of the optical wave field of digitally recorded holograms. The required modulo 2 phase map in any contouring process is obtained by means of the direct subtraction of two phase-contrast images under different illumination angles to create a phase-difference image of a still object. Obtaining the phase-difference images is only possible by using the capability of numerical reconstruction of the complex optical field provided by digital holography. This unique characteristic leads us to a robust, reliable, and fast procedure that requires only two images. A theoretical analysis of the contouring system is shown, with verification by means of numerical and experimental results. © 2006 Optical Society of America

• Autores: García Sucerquia, Jorge Iván; Velásquez Prieto, Daniel Ignacio; García Sucerquia, Jorge Iván; Velásquez Prieto, Daniel Ignacio
• Fecha de publicación: 2006
• Institución: Universidad EAFIT
• Repositorio: Repositorio EAFIT
• Idioma: eng
• OAI Identifier: oai:repository.eafit.edu.co:10784/2798
• Acceso en línea: http://hdl.handle.net/10784/2798
• Palabra clave: Reconstrucción 3D; HOLOGRAFÍA; SISTEMAS DE REPRESENTACIÓN TRIDIMENSIONAL; DIFRACCIÓN; CONVOLUCIONES (MATEMÁTICAS); MODELOS MATEMÁTICOS; ÓPTICA; PROCESAMIENTO DIGITAL DE IMÁGENES; Three-dimensional display systems; Holography; Diffraction; Convolutions (Mathematics); Mathematical models; Optics; Image processing - Digital techniques; Reconstrucción 3D
• License: Acceso restringido