Multi-Focal Projection

Many multi-projector rendering techniques exist that aim at creating a high consistency of image geometry, intensity and color. We proposed a concept and a solution for considering and optimizing a fourth image property -- its focus. We describe a novel multi-focal projection concept that applies conventional video projectors and camera feedback. Multiple projectors with differently adjusted focal planes, but overlapping image areas are used. They can be either arbitrarily positioned in the environment, or can be integrated into a single projection unit. During an automatic one-time calibration process, structured light projection together with camera feedback allows to measure the relative focus value of every projector pixel on an arbitrary diffuse surface. Thereby, the focus values are geometrically and radiometrically corrected. If this is known, a final image with minimal defocus can be composed in real-time from individual pixel contributions of all projectors. Our technique is independent of the surfaces' geometry, color and texture, of the environment light, as well as of the projectors' parameters (i.e., position, orientation, luminance and chrominance).

Category:

Science & Technology

Tags:

• computer
• augmented
• reality
• electronics
• environment
• projection