motion depth cues – motion 1. parallax. motion depth cues – parallax
Post on 20-Dec-2015
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Motion Depth Cues
– Motion1. Parallax
Motion Depth Cues
– Parallax
Motion Depth Cues
– Parallax– points at different locations in the visual field
move at different speeds depending on their distance from fixation
Motion Depth Cues
– Parallax
Seeing in Seeing in StereoStereoSeeing in Seeing in StereoStereo
Seeing in Stereo
It’s very hard to read words if there are multiple images on your retinaIt’s very hard to read words if there are multiple images on your retina
Seeing in Stereo
It’s very hard to read words if there are multiple images on your retinaIt’s very hard to read words if there are multiple images on your retina
But how many images are there on yourretinae?
Binocular Disparity
• Your eyes have a different image on each retina– hold pen at arms length and fixate the spot
– how many pens do you see?– which pen matches which eye?
Binocular Disparity
• Your eyes have a different image on each retina– now fixate the pen
– how many spots do you see?– which spot matches which eye?
Binocular Disparity
• Binocular disparity is the difference between the two images
Binocular Disparity
• Binocular disparity is the difference between the two images
• Disparity depends on where the object is relative to the fixation point:– objects closer than fixation project images that
“cross”– objects farther than fixation project images that
do not “cross”
Binocular Disparity
• Corresponding retinal points
Binocular Disparity
• Corresponding retinal points
Binocular Disparity
• Corresponding retinal points
Binocular Disparity
• Corresponding retinal points
Binocular Disparity
• Points in space that have corresponding retinal points define a plane called the horopter
The Horopter
Binocular Disparity
• Points not on the horopter will be disparate on the retina (they project images onto non-corresponding points)
Binocular Disparity
• Points not on the horopter will be disparate on the retina (they project images onto non-corresponding points)
• The nature of the disparity depends on where they are relative to the horopter
Binocular Disparity
• points nearer than horopter have crossed disparity
• points farther than horopter have uncrossed disparity
The Horopter
Binocular Disparity
• Why don’t we see double vision?
Binocular Disparity
• Why don’t we see double vision?
• Images with a small enough disparity are fused into a single image