Seeing 3D from 2D Images. William and Craig 115 - 164. How to make a 2D image appear as 3D!. Output is typically 2D Images Yet we want to show a 3D world! How can we do this? We can include ‘cues’ in the image that give our brain 3D information about the scene
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
William and Craig 115 - 164
The result of the two slightly different views of the external world that our laterally-displaced eyes receive.
If both eyes are fixated on a point, f1, in space, then an image of f1 if focused at corresponding points in the center of the fovea of each eye. Another point, f2, at a different spatial location would be imaged at points in each eye that may not be the same distance from the fovea. This difference in distance is the retinal disparity.
+a+c+b+d = 180
+c+d = 180
- = a+(-b) = 1+2 = Retinal Disparity
Each eye sees a different screen
Optical system directs each eye to the correct view.
HMD stereo is done this way.
Two different images projected on the same screen
Images are polarized at right angles to each other.
User wears polarized glasses (passive glasses).Time Parallel Stereoscopic Display
The screen parallax is the distance between the projected location
of P on the screen, Pleft, seen by the left eye and the projected
location, Pright, seen by the right eye (different from retinal disparity).
p = i(D-d)/D
where p is the amount of screen parallax for a point, f1, when projected onto a plane a distance d from the plane containing two eyepoints.
i is the interocular distance between eyepoints and
D is the distance from f1 to the nearest point on the plane containing the two eyepoints
d is the distance from the eyepoint to the nearest point on the screen
Zero parallax at screen, max positive parallax is i, negative parallax is equal to I halfway between eye and screen
Projection Plane is orthogonal to one of the major axes (usually Z). That axis is along the vector defined by the eyepoint and the look-at point.
Look at point
Look at points
The size of the window does
not affect the retinal disparity
for a real window.
Once computed, the screen parallax
is affected by the size of the display
Screen parallax is measured in terms of visual angle. This is a screen
independent measure. Studies have shown that the maximum angle
that a non-trained person can usually fuse into a 3D image is about
1.6 degrees. This is about 1/2 the maximum amount of retinal disparity
you would get for a real scene.
Maximum Depth Plane
Maximum Depth Plane
Change in eyepoint separation with change in point of fixation.
Centers of rotation of the eyes are assumed to be 6.4 centimeters apart.
Luminance of the correct eye image
Luminance of the opposite eye ghost image
Extinction Ratio =
Image Position RedWhite
Top 61.3/1 17/1
Middle 50.8/1 14.4/1
Bottom 41.1/1 11/1