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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?