Depth perception I

Question 1

What are the different ways of analysing depth?

Answer 1

• Absolute distance
• Relative distance
• Local surface orientation
• Global surface shape

Question 2

What is absolute distance?

Answer 2

The distance of any single object from the observer. Can specify objects in terms of the visual angle that they subtend at the eye.

Question 3

What is relative distance?

Answer 3

Differences in distance of 2 objects or planes

Question 4

What is local surface orientation?

Answer 4

The orientation of a line perpendicular to the surface of an object at any location on the surface.
look like needles sticking out of the surface.
local surface orientation may be defined by slant and tilt

Question 5

What is global surface shape?

Answer 5

The orientation or variation in orientation of a region of an objects surface.

Question 6

What are all the monocular cues for depth perception

Answer 6

• Motion parallax
• Accommodation
• Angular declination
• Pictorial - relative size, familiar size, linear perspective, texture, interposition, clarity, lighting and shadow.

Question 7

What are all the binocular cues for depth perception

Answer 7

• Retinal disparity
• convergence

Question 8

Motion parallax

Answer 8

when we are moving, objects closer to us seem to move faster than objects that are further away from us

Question 9

Accommodation

Answer 9

• To converge to a near point you have a thick lens and a large angle due to accommodation.
• To focus on an object in the distance you have a thin lens and a small angle.

Question 10

Angular declination

Answer 10

objects that are closer to us have a greater extent or degree of angular declination below the horizon.
-The greater the angular declination the closer the object is to us

Question 11

pictorial

Answer 11

Relative size - interpret larger images as being closer
Familiar size - know what the usual dimension of the object is
Linear perspective - use of a vanishing point. lines converge to a distance point.
Texture - variation in spatial arrangements of patterns in the visual system
Interposition - Objects placed in front of one another which occludes the objects placed behind
Clarity - how sharp or blurred
Lighting and shadow - objects further away appear lighter. use of shadow.