AUTOSTEREOSCOPIC IMAGING TECHNIQUES FOR 3D TV, Study Guides, Projects, Research of Electronic Technology

Download AUTOSTEREOSCOPIC IMAGING TECHNIQUES FOR 3D TV and more Study Guides, Projects, Research Electronic Technology in PDF only on Docsity!

AUTOSTEREOSCOPIC

IMAGING TECHNIQUES FOR

3D TV: PROPOSALS FOR

IMPROVEMENTS

INTRODUCTION

 HUMAN BINOCULAR VISION

Human eyes are slightly distant apart, each eye sees different images having small angle difference. Human brain process these two images into a single image, it has the quality of depth

 AUTOSTEREOSCOPY

Method of displaying stereoscopic images without

the use of special headgear or glasses on the part

of the viewer

 AUTOSTEREOSCOPIC DISPLAY TECHNOLOGIES

HOLOGRAPHIC DISPLAY

Encoding of the light field as an interference pattern in photographic medium

VOLUMETRIC DISPLAY

Projecting precisely coordinated laser beams into a medium containing rare earth materials, exciting those materials to display a monochromatic image

 LENTICULAR LENSLET

An array of cylindrical lenslets is placed in front of the pixel raster Lens focuses on the image information located behind it and directs light in different directions Position of the viewer is less restricted Brighter & optically efficient than parallax barrier

AUTOSTEREOSCOPIC TELEVISION  3 D TV with glasses Color filters worn on eye cause discomfort among viewers Hence we go for “ AUTOSTEREOSCOPIC TELEVISION” TECHNOLOGIES USED Fly’s eye lenses Lenticular lenslets Fig: a part of lenticular lens screen

 5 Video cameras placed in front of the object forming 4 - flipped binocular vision  Lenticular screen converts optical image to line image pattern  Scanning mechanism produces standard video signal from the line image pattern  VBT(Video Band Translation Unit) which obtains the band of frequencies of the channel to a range suitable for transmission with the present day TV transmitter system  Channel band falling in the middle of all five bands is considered to be the key band for the transmitter and the system

 SYSTEM 1 - RECEIVER  A pair of lenticular lenses with white diffuser sandwiched in between them  Electronic tune all five signals at the same time  Video projectors arranged in angular positions similar to that of the cameras used in the transmitter

AUTOSTEREOSCOPIC TV WITH SPATIALLY DIVIDED COMPLEX COLOR PICTURE PATTERN: SYSTEM- 11

 SYSTEM 11- TRANSMITTER

 HDTV system for transmitting and receiving high density line images of lenticular lens screen Spatial image created by lenticular lens screen is divided into two parts by registering the images of four cameras in two lenticular screens Spatial density of image in each lenticular screen would be half that of single lenticular lens system Video signals from alternate cameras C 1 and C 3 projected video projectors P 1 and P 3 Complex color picture pattern of screen 1 & 2 is captured by HDTV camera (HC 1 &HC 2 ) for video transmission

 SYSTEM 11 - RECEIVER

Digitization of video signal is performed in a high performance and cost effective flash Analog to Digital Converter Digitized video signals are taken to an image processing unit for spatial interleaving Digital image is converted to analog video by DAC

3D VISION PROCESS

 PARAMETERS

Diameter of cylindrical lens Size of lenticular screen Definite viewing angular range-α Extended converage region-β Range of depth vision possible-R

PERFORMANCE ANALYSIS

 CLARITY OF 3D VISUALIZATION

 SYSTEM 1 Five angular views & four flipped binocular presentations offer Parallax effect with realistic visualization of 3 D image  SYSTEM 11 Four angular views and spatial splitting of the complex picture pattern with two lenticular screens Spatially divided patterns can be successfully transmitted and received Three flipped binocular views while shifting slightly the viewing positions.

Fig: Complex color picture pattern. Left top: part of full pattern, right top: first half in one lenticular screen, left bottom: second half in next lenticular screen.