Resumen de Disparity: based photometric stereo
José R. A. Torreão, Cecilio J. L. Pimentel
We point out a relationship between the processes of Stereoscopy an Photometric Stereo which can be exploited for the estimation of depth with single-camera imaging set-ups.
The displacement of pixel intensities observed when the illumination direction changes, in the formation of photometric stereo image pairs, can be treated as a disparity map arising in an equivalent convergent stereoscopic system. Such photometric disparity map can thus be estimated through the use of a stochastic approach which essentially matches the two images at pixel level, while the shape of the pictured surface can be simultaneously reconstructed by the usual photometric stereo technique. From the dispariy and shape information, the parameters of the equivalent stereoscopic system can be estimated, and a depth field can thus be recovered by triangulation. This strategy allows the simultaneous shape and depth reconstruction from photometric stereo im-age pairs, which could be useful for simple industrial vision applications. Preliminary experimental results obtained with such scheme, for synthetic images, are presented.
