chapter 6

Question 1

depth perception

Answer 1

the ability to see things in three dimensions and judge how far away objects are in a visual image

process of inferring the spatial arrangement of the world around us

Question 2

what are the two types of depth perception?

Answer 2

monocular and binocular

Question 3

monoculars

Answer 3

a sense of depth obtained while viewing an image with one eye (or while viewing a 2-D image)

Question 4

binocular

Answer 4

a sense of depth that relies on the difference in images between both eyes

Question 5

M.C. Escher

Answer 5

1898-1972; used monocular depth cues in a funny kind of way in his art

Question 6

impossible structures

Answer 6

structures that would be impossible in the real world. local monocular depth cues are correct, but the depth cues add up to an impossible world

Question 7

monocular depth cues

Answer 7

cues that help us make inferences about depth with only one eye

Question 8

occlusion

Answer 8

monocular depth cue #1
when an object is covered up by another object
non metrical depth cue

Question 9

relative size

Answer 9

monocular depth cue #2
small objects tend to look further away than large objects

Question 10

relative height

Answer 10

monocular depth cue #3
objects that are higher tend to look further away than lower objects

Question 11

what two monocular depth cues combine to provide a powerful depth illusion?

Answer 11

relative size & height

Question 12

familiar size

Answer 12

monocular depth cue #4
knowing the size of an object can also influence depth judgments

Question 13

metrical depth cues

Answer 13

provide information about order and distance

Question 14

what are some examples of metrical depth cues?

Answer 14

relative height, relative size, familiar size

Question 15

aerial perspective

Answer 15

monocular depth cue #5
objects that are far away tend to be hazier, bluer, and less distinct

Question 16

atmosphere

Answer 16

scatters light, making more-distant features look hazier

Question 17

contouring

Answer 17

uses the monocular depth cue of shading and shadows to create an illusion of depth

Question 18

motion parallax

Answer 18

monocular depth cue #6
if you are moving sideways, objects that are near you will move faster than objects in the distance

Question 19

optic flow

Answer 19

monocular depth cue #7
the general motion of objects in a visual scene produced by a moving observer

Question 20

linear perspective

Answer 20

monocular depth cue #8
lines that parallel in a 3D world tend to converge in a 2D image

Question 21

ponzo illusion

Answer 21

an optical illusion in which line A seems bigger than B, but both of the lines are actually the same size

Question 22

why do ponzo illusions occur?

Answer 22

because of monocular depth cues

Question 23

ponzo illusion explanation

Answer 23

line A looks further away because of linear perspective

if two objects have an equal on the renal image size, the object that is further away should be large in the physical world (relative size)

Question 24

forced perspective

Answer 24

a photo technique that uses monocular depth cues to alter the size of objects

also a common movie trick (elf)

Question 25

ames room illusion

Answer 25

invented by adlebert ames jr 1946 room is viewed through a peephole, and the perceived 'normal' room is actually a convex polyhedron