Lecture 5 Flashcards
(24 cards)
What are monocular cues?
a) Cues available to both eyes.
b) Cues available to one eye only, usable by artists for 2D representations.
c) Cues that only work for close distances.
d) Cues that require motion.
B
How does height in the visual field act as a cue for distance?
a) Objects closer to the viewer appear higher.
b) Objects at a greater distance occur higher in the visual field and project lower on the retinal image.
c) Objects at the same distance appear at the same height.
d) It only works for very tall objects.
B
How does geometrical perspective work as a depth cue?
a) Parallel lines appear to converge with distance.
b) Parallel lines appear to diverge with distance.
c) Parallel lines become blurred with distance.
d) Parallel lines change color with distance.
A
How does texture gradient indicate distance?
a) Coarse texture is seen as further away.
b) Fine (denser) texture is seen as further away.
c) Texture becomes clearer with distance.
d) Texture disappears with distance.
B
How does the size of familiar objects act as a depth cue?
a) Image size increases with increasing distance.
b) If the object size is unknown, its distance can be gauged.
c) Image size decreases with increasing distance, allowing distance to be gauged if object size is known.
d) It only works for very large objects.
C
How does occlusion indicate distance?
a) Far objects overlap close objects.
b) Partially occluded objects are seen as close.
c) Close objects overlap far objects, and partially occluded objects are seen as distant.
d) Occlusion only provides information about object shape.
C
Why do more distant objects appear bluer?
a) Because light has to travel a greater distance, and there is more scattering on the blue end of the spectrum.
b) Because distant objects reflect more blue light.
c) Because the eye perceives blue better at a distance.
d) Because the atmosphere absorbs all other colors.
A
To interpret shadows for depth, what assumption is typically made about light direction?
a) Light from below.
b) Light from the side.
c) Light from above.
d) Light from behind.
C
What is a characteristic of pictorial cues, as used by painters?
a) They are unambiguous.
b) They are ambiguous, as many 3-D situations can produce the same 2-D image.
c) They only work for familiar objects.
d) They only work in bright light.
B
What is an example of a dynamic depth cue?
a) Texture gradient.
b) Motion parallax.
c) Occlusion.
d) Shadow.
B
In motion parallax, how do close objects appear to move relative to our direction of travel?
a) Slowly.
b) They appear stationary.
c) In the same direction.
d) Opposite to our direction of travel and fast.
D
What is one of the binocular cues for depth and distance?
a) Motion parallax.
b) Monocular convergence.
c) Binocular convergence.
d) Height in the visual field.
C
How does binocular convergence help perceive depth?
a) For close objects, eye muscles converge less.
b) For close objects, eye muscles converge much harder.
c) It only works for far objects.
d) It relies on the color of objects.
B
What is stereopsis?
a) The perception of depth from the difference in left and right eye views.
b) The perception of depth from blurring.
c) The perception of depth from object size.
d) The perception of depth from shadows.
A
What specific shift in views is a cue to depth and distance in stereopsis?
a) Vertical shift.
b) Rotational shift.
c) Horizontal shift.
d) Diagonal shift.
C
What tools allow different images to be presented to the left and right eyes for perceiving stereoscopic depth?
a) Regular sunglasses.
b) Red-green viewing glasses.
c) Binoculars.
d) Magnifying glasses.
B
How can depth be shown through motion parallax using red-green glasses?
a) By alternating the two eye views.
b) By keeping the views static.
c) By increasing the distance.
d) By decreasing the motion.
A
What relationship exists between motion and closeness in alternating eye views for depth perception?
a) Smaller motion = closer.
b) Motion indicates distance.
c) Motion is irrelevant to closeness.
d) Bigger motion = closer.
D
Besides motion, what other factor gives depth in a combined view with red/green glasses?
a) Object color.
b) Light direction.
c) Object texture.
d) Lateral shift in image position in two views.
D
What is another cue to depth and distance related to the eye’s focus?
a) Retinal image size.
b) Eye movement speed.
c) Accommodation of the focus of the eye.
d) Pupil dilation.
C
For what maximum distance does stereoscopic depth typically work effectively?
a) More than three meters.
b) Less than three meters.
c) Any distance.
d) Only very short distances
B
Which type of depth cues can an artist use to create a 2D representation of the world?
a) Binocular cues.
b) Dynamic cues.
c) Monocular cues.
d) Stereoscopic depth.
C
What happens to the retinal image of objects at greater distances?
a) They project higher on the retinal image.
b) They become blurred.
c) They become inverted.
d)They project lower on the retinal image.
D
What are the cues available to painters for seeing depth and distance?
Height in the field of view, geometrical perspective, texture gradient, size of familiar objects, occlusion or overlap, blurring and increase of blueness, shadow
