DEMONSTRATION

RPT / X’TAL VISION

• HMD (Head Mounted Display)

• CAVE (Cave Automatic Virtual Environment)

• Occlusion Problem

RETROREFLECTIVE SURFACE

• Corner Cube Arrays, Fly-eye lenses with diffusers & micro-beads.

• Micro-beads :• R.I - 2• Diameter - 50mm

PRINCIPLE OF RPT• Object covered with

Retro-reflective material is used as screen

• Projector is placed on the position optically conjugated with the observer’s eye by using a half-mirror

• Projector’s iris (pinhole) is very small

ADVANTAGES

• Accurate Occlusion Relations• Arbitrary Screen Shapes• No Distortion of Image• High Resolution • Stereoscopic Images• Binocular Stereovision

• Pre-captured x-ray and/or MRI data can be superimposed onto a human patient so that a surgeon can have open surgery.

• Superimposing ultra-sonic data, real-time presentation of inner body information is also possible.

APPLICATIONS OF RPT

DEMONSTRATION

BINOCULAR STEREOVISION• Two Eyes = Two Separate

Views– Each eye takes a view of same

location with slightly different angle

• Two Eyes = 3-D– Each eye capture its own view

– Two separate view are sent to brain

– Brain combines them by matching similarities and adding differences

– 3-D Stereo Picture

HEAD MOUNTED PROJECTOR

• Uses X’tal Vision (RPT)• Conjugate Optical System

– Provides High Resolution

• When Image appears on the retro-reflective material – Viewer can observe the images

projected on the retro-reflective material occluded by the object which exists in front of the screen.

• Front Projection• Augmented Reality (AR)

WORKING

• Produces Binocular Stereovision

• A HMP can observe a stereoscopic image on a retro-reflective screen.– The distance between an

HMP and a projector should be less than 3.3 m.

– The distance between each eye is assumed to be 63 mm.

• Two liquid crystal display panels.

• Camera lens projects the image with wide angle.

• A Fiber guided light source is fixed above the LCD panels.

• Image is projected on the screen covered with retro-reflective material with the accurate occlusion relationships.

OPTICAL CAMOUFLAGE

• RPT / X’tal Vision• See-Through Head

Mounted Display• Transparent Cloak

PRINCIPLE OF WORKING

• An HMP projects an image of the background scenery captured by the video camera behind the camouflaged subject.

• A computer calculates the appropriate perspective and transforms the captured image to the image to be projected on the subject using image-based rendering techniques.

• Cloak, the subject is wearing, is made of a special retro-reflective material.

DEMONSTRATION

APPLICATIONS

• In Safe Landings of Planes• In Parking Vehicles

FUTURE?• Military devices based on "active" camouflage.• Invisible Vehicle Design by NASA's Jet

Propulsion Laboratory • Invisible Human (spy)

– Rather than one video camera, we'll need at least six stereoscopic pairs (facing forward, backward, right, left, upward, and downward) - enough to capture the surroundings in all directions.

• Invisibility Detection Agencies

QUESTIONS?