14 -Depth Perception - Part II (9.26.25)

DEPTH PERCEPTION- PART II

9.26.25

Announcements

Agenda

• Binocular Depth Cues

• Dynamic Monocular Depth Cues

Ponzo Illusion

• Ponzo illusion - objects are the same size, but one appears larger.
• This happens because we see the objects in relation to the context immediately behind them,
• i.e. Railroad tracks appear to recede in depth based on the cue of linear perspective
• Supported by the other cues in the photo, such as
• texture gradient of the stones in the track bed
• familiar size of tracks
• relative height in the image

Ames Room

a trapezoidal room designed to appear rectangular when viewed from a single, specific vantage point

Binocular depth cues

Retinal disparity

Binocular depth cues come from comparing the two retinal images.

the amount of disparity (difference) between the retinal images for each eye

Try it out:

• Hold up a single finger and look at it with first one eye closed and then the other.
• A lamp across the room seems to jump from one side of your finger to the other.

Binocular depth cues

Corresponding Point

• a point at which there is no difference in the 2 retinal images (retinal disparity)

• the corresponding point falls at the same spatial location on both retinas

(could be seen if you superimposed the 2 retinal images)

Binocular depth cues

Horopter

Corresponding points fall on an imaginary line called a horopter (an imaginary curved surface established whenever a person fixates on an object)

• represented by a dashed line

• why it matters:
• any object that falls on the horopter will project retinal images at corresponding points on the left & right retinas

Binocular depth cues

3 types of retinal disparity

1) Crossed disparity - Type of binocular disparity produced by an object that is closer than the horopter

• You would have to “cross” your eyes to look at it

Binocular depth cues

3 types of retinal disparity

2) Uncrossed disparity - Type of binocular disparity produced by an object that is farther away than the horopter

Binocular depth cues

3 types of retinal disparity

1) Zero disparity - Type of binocular disparity in which the retinal image of an object falls at corresponding points in the two eyes.

Dynamic monocular depth cues - provide info about depth using clues from...

Optic flow

Motion parallax

Deletion & accretion

Thanks Everyone!

Next Class:

• Depth perception (cont'd)
• Motion perception

Don’t forget your exit ticket

More stereograms to try + tips for how to see -->

Deletion & accretion

Deletion: Dynamic depth cue that refers to the gradual hiding (occlusion) of an object as it passes behind another one. Accretion: Dynamic depth cue that refers to the gradual revealing (“de-occlusion”) of an object as it emerges from behind another one.

Optic Flow

A form of motion parallax that involves moving forward and backward (rather than across a scene)

As you move across (sideways) a visual scene: closer objects move faster across the retinal image

Write a great headline

Demonstrate enthusiasm, give a smile, and maintain eye contact with your audience can be your best allies when it comes to telling stories that excite and pique the audience's interest: 'The eyes, kid. They never lie'. This will help you make a connection with your audience. Leave them speechless!

Write a great headline

Demonstrate enthusiasm, give a smile, and maintain eye contact with your audience can be your best allies when it comes to telling stories that excite and pique the audience's interest: 'The eyes, kid. They never lie'. This will help you make a connection with your audience. Leave them speechless!

Write a great headline

Demonstrate enthusiasm, give a smile, and maintain eye contact with your audience can be your best allies when it comes to telling stories that excite and pique the audience's interest: 'The eyes, kid. They never lie'. This will help you make a connection with your audience. Leave them speechless!

Write a great headline

Demonstrate enthusiasm, give a smile, and maintain eye contact with your audience can be your best allies when it comes to telling stories that excite and pique the audience's interest: 'The eyes, kid. They never lie'. This will help you make a connection with your audience. Leave them speechless!

Write a great headline

Demonstrate enthusiasm, give a smile, and maintain eye contact with your audience can be your best allies when it comes to telling stories that excite and pique the audience's interest: 'The eyes, kid. They never lie'. This will help you make a connection with your audience. Leave them speechless!