The structured light technique is useful to evaluate the topography of an object. By using the Fourier transform, the
phase of a fringe pattern is obtained from a single image. With the phase information and the sensibility vector of the
optical system, the value z(x, y) at each point of the object can be determined. It is known that color is a subjective
sensation, and it changes depending on the observer. In order to make an association of real color and texture, it is
necessary to calibrate and profile the optical devices involved in the process. Thus, we ensure that the color detected by a
camera is the same displayed on the monitor and perceived by the observer, so it is possible to associate the color of the
target object in addition to the evaluation of topography.
On the other hand, 3D visualization is possible by using a stereoscopic system that provides two different images of the
same object (one for each eye). One possible technique is that known as the anaglyph method, based on the binocular
disparity of two images obtained with different color filters. Each one of the images is taken with complementary colors
(red-blue or red-green), and the tri-dimensional shape can be seen through the use of special glasses; this way, each eye
sees an image from its own angle. Object topography is obtained with the fringe projection technique, and then one
image is selected and pseudo colored; then, the second image is taken, slightly changing the perspective of the tridimensional
display and pseudo coloring it with a complimentary color. A computational algorithm is developed to
evaluate and visualize the object in real time.
Three-dimensional object topography is obtained by using the fringe projection technique. In fringe projection technique,
digitalization is done when black and white lines are projected over the sample object and the image is captured by the
CCD. It is applied the phase shifting method to evaluate the phase of the projected fringes. In this paper it is proposed a
method in which red, green and blue fringes are projected sequentially. It is obtained the topography to each color (RGB)
and finally the three obtained shapes are averaged. By using this method, we obtain information about color, texture and
topography details of the object.