Diffuse structured light

Abstract

Today, structured light systems are widely used in applications such as robotic assembly, visual inspection, surgery, entertainment, games and digitization of cultural heritage. Current structured light methods are faced with two serious limitations. First, they are unable to cope with scene regions that produce strong highlights due to specular reflection. Second, they cannot recover useful information for regions that lie within shadows. We observe that many structured light methods use illumination patterns that have translational symmetry, i.e., two-dimensional patterns that vary only along one of the two dimensions. We show that, for this class of patterns, diffusion of the patterns along the axis of translation can mitigate the adverse effects of specularities and shadows. We show results for two applications -3D scanning using phase shifting of sinusoidal patterns and separation of direct and global components of light transport using highfrequency binary stripes.

High Dynamic Range Saturation Intelligence Avoidance for Three-Dimensional Shape Measurement

“…Qing et al [1] added appropriate color filters in the front of the camera and projector to separate the input light so that a certain color light can be pass through. Mohit Gupta et al [2] put a diffuser between the light source and the scene. Each pixel would be illuminated by an extended source in the scene because every illumination plane cross the linear diffuser along the diffusion axis.…”

Structured Light in Sunlight

“…An example is illustrated in Figure 9. It is possible to overcome this limitation partly by diffusing the projected patterns [9]. 06:00 am 08:00 am 10:00 am 14:00 pm 12:00 pm Object placed outdoors (inset -sky image).…”

A light transport model for mitigating multipath interference in Time-of-flight sensors

“…In addition, light transport techniques have been very successful for the challenging problem of 3-D scanning of translucent objects [25,20] and high quality structured light scanning [36,13,37,14].…”