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Different autostereoscopic display technologies for 3D TV, including holographic display, volumetric display, parallax barrier, and lenticular lenslet. It explains how human binocular vision works and how autostereoscopic display technologies try to replicate it. The document also presents two different systems for autostereoscopic 3D TV receivers and compares their complexity and cost-effectiveness. technical details and diagrams to explain the different concepts.
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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
AUTOSTEREOSCOPIC DISPLAY TECHNOLOGIES
Encoding of the light field as an interference pattern in photographic medium
Projecting precisely coordinated laser beams into a medium containing rare earth materials, exciting those materials to display a monochromatic image
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
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
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
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
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.