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IMPROVING 3D TV VIEWING EXPERIENCE USING VISUAL ATTENTION MODEL
PRESENTED BY GUIDED BY
RAHUL P KRISHNAN S7L ,Roll No:52 Mrs. MARY JOSEPH
ELECRONICS AND COMMUNICATION
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CONTENTS AN INSIGHT TO THE TOPIC ISSUES WITH CURRENT SYSTEM CONCEPT OF VISUAL ATTENTION INTEGRATION OF VISUAL ATTENTION
INFORMATION TO IMPROVE 3D TV VIEWING EXPERIENCE
CONCLUSION
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INSIGHT TO TOPIC STRONG PUSH FOR 3D CONTENT IN THE
FIELD EXTENDED VIEWING ON 3D TV REPORTS
VISUAL DISCOMFORT,FATIGUE,STRAIN VIEWERS TEND TO FOCUS THEIR
ATTTENTION ON SPECIFIC AREAS OF INTEREST IN IMAGE
MOST OF THE 2D WORK FLOWS NOT EASILY USED IN 3D
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PERCEPTIONAL ISSUES WITH 3D TV
Depth Cues :combination and conflicts
Vergence and Accommodation
Binocular fusion and Rivarlry
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VISUAL ATTENTION Mechanism allowing to select
and analyze some parts of the visual field
3 major functions Alerting Orienting Searching
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TWO MECHANISM Bottom Up Involuntary and unconscious Low cognitive Load Signal driven Top Down Voluntary and conscious High cognitive Load Task driven
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EYE TRACKING EXPERIMENT
•RECORDS SCAN PATHS IN TERMS OF SACCADES AND FIXATIONS •IDENTIFICATION OF THE LOCATIONS OF VISUAL INTEREST IN THE CONTENT(SALIENCY) ,THUS CREATING SALIENCY MAPS
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FIXATION LOW VELOCITY EYE MOVEMENT
DIRECTING A PART OF VISUAL FIELD INTO FOVEA FOR CLOSE INSPECTION OF A LOCATION
CARRY VERY HIGH INFORMATION PROCESSING
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SACCADES RAPID EYE MOVEMENTS MOVING
ATTENTION BETWEEN LOCATIONS IN THE VISUAL STIMULUS
CARRY ALMOST NO INFORMATION PROCESSING
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SALIENCY MAP The Saliency Map is a topographically
arranged map that represents visual saliency of a corresponding visual scene.
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HOW CAN WE IMPROVE 3D TV VIEWING EXPERIENCE THROUGH VISUAL ATTENTION MODELS ?
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3D TV DELIVERY CHAIN
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3D VIDEO CAPTURE SHOOTING TECHNIQUE OF 2D AND 3D
ARE DIFFERENT SITUATION WHERE VIEWERS UNABLE TO
FUSE THE STEREO IMAGES AUDIENCE VISUAL ATTENTION MODEL
REPLACE THE NEED TO CONDUCT EXPERIMENTS A POSTERIORI AND COULD BE USED ON SITE
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2D TO 3D CONVERSION HIGH 2D CONTENT AVAILABLE NEW TV SET HAS 2D TO 3D
CONVERSION USING INFORMATION FROM DEPTH MAP
SALIENCY MAP PARALLAX COMPUTATION
3D IMAGE SALIENCY MAP + DEPTH MAP =
COMFORT 3D
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CONTENT REPURPOSING ADAPTATION OF ASPECT RATIO
DIFFERENCE
AUTOMATED CROPPING WINDOW FROM VISUAL ATTENTION MODEL(VAM)
BORDER EFFECT:CUTTING OBJECTS IN FRONT OF SCREEN INHIBITS PERCEPTION OF DEPTH
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DEPTH ADAPTATION SCREEN SIZE AND VIEWING DISTANCE
AFFECTS DEPTH PERCEPTION
ADAPTIVE RENDERING OF 3 D CONTENT
SALIENCY MAP + DISPARITY MAP
AREA OF INTEREST IN ZERO PARALLAX PLANE
DOMINANT AREA
VAM
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ENCODING OF 3D VIDEO SIMULCAST TRANSMISSION OF DEPTH
MAPS EXTENTION TO AVC/H.264 ,MVC (multi
view coding) IS USED MVC = STANDARD FORMAT ON BLUE
RAY ROI (region of interest) BASED
COMPRESSION CAN BE APPLIED
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DECODING AND RENDERING DIBR(depth image based rendering) is
used, rely on depth map Frame freezing strategy leads to
temporal desynchronization or strong binocular rivalryERROR Switching back to 2D DISCOMFO
RT
“So main area of interest in display plane”
Adaptive error concealment in terms of visual importance
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BLURRING EFFECTS Reduce accommodation vergence
conflict Simulating depth of field(DOF) uses this
method
Directs viewers attention towards a specific area of image which is in comfort zone
Localiztion of eye position
Determination of fixation point
Implementation of blur filters to non fixated layers
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3D SUBTITLE Difference b/w convergence planes leads
to discomfort Largest disparity region on display
plane3D dynamics behind the displaysubtitle on display
3D dynamics changes Can adopt depth dependent subtitle
placement using VAM
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CONCLUSION
Understanding of VAM is important to improve QoE of 3D tv
Informations from VAM can be integrated along delivery chain to improve 3D tv experience
Adaptation of cinema environment is necessary for success in home screen
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REFERENCES WIKIPEDIA IEEE TRANSACTIONS ON BROADCASTING
VOL.57,NO.2,JUNE 2011
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QUERIES