Occlusion Shadows

Projection-based augmented reality systems, such as the Virtual Showcase, share many positive properties of projection-based virtual environments. These displays provide high resolution, improved consistency of eye accommodation and convergence, little motion sickness potential, and the possibility of an integration into common working environments. One of the main challenges for projection-based AR systems as well as for head-mounted optical see-through displays is the generation of correct occlusion effects between virtual and real objects. Additionally shadows of virtual objects cast onto real ones and consistent illumination of the real and virtual scenery are often difficult to achieve. We introduce projector-based illumination techniques for view-dependent optical seethrough AR displays. This approach has the potential to solve all of the above mentioned problems. Here, we focus on using projector-based illumination for creating correct occlusion effects for mixed reality configurations.
We have implemented and tested such a system in the context of the Virtual Showcase, which consists of a horizontal projection screen and a convex half-silvered mirror assembly. Virtual and real objects can be displayed in the same space inside the showcase. The original Virtual Showcase used a standard light bulb to illuminate real objects. This setup does not provide very much control over the lighting situation. By using a computer-controlled video-projector as a replacement for the simple light bulb, we are able to fully control the lighting situation inside the showcase on a perpixel basis. Our main contribution is a solution to the problem of correct occlusion for mixed reality scenarios with viewdependent optical see-through displays. Our method produces correct occlusion effects between virtual and real objects by projecting shadows onto real objects located behind virtual ones using projector-based illumination.
Bimber, O. and Fröhlich, B.
Occlusion Shadows: Using Projected Light to Generate Realistic Occlusion Effects for View-Dependent Optical See-Through Displays
In proceedings of International Symposium on Mixed and Augmented Reality (ISMAR'02), pp. 186-195, 2002

Category:

Science & Technology

Tags:

• computer
• environment
• augmented
• reality

[kght222]

i think my face just melted...... wait that was just my brain.

[himself86]

@twdarkflame it would also be great for princess Leia

[twdarkflame]

Excelent work. I really can see this being great for universitys, musuems and companys wishing to visualise products.

I dont think its quite as flexible as (hypothetical not-yet-existing) good quality hmds will be, but its achievable now, and for static installations with controlled lighting it will probably always be the best method.

[crustea]

incredible..

Are you using vvvv ?