Object Recognition

Question 1

True or False

Perception involves in deciding which interpretation of the reality is the most likely.

Answer 1

True

This is made with “committees”.

Question 2

Committee Rules

Answer 2

1. Put together what goes together (Gestalt Rules)
2. Avoid Accidents (Accidental viewpoint)
3. Honour Physics (Occlusion)
4. Reach Consensus (Ambiguous figures)
5. Separate what should be separated (Figure vs background)

Question 3

Accidental Viewpoint

Answer 3

A viewing position that produces some regularity in the visual image that is not present in the world.

Question 4

Occlusion

Answer 4

A solid object is blocking light.

Question 5

Figure-ground Assignment

Answer 5

The process of determining that some regions of an image belong to a foreground object (figure) and some others are part of the background (ground).

Question 6

Gestalt figure-ground assignment principles

Answer 6

• Surroundedness: the surrounding region is most likely ground
• Size: The smaller the region, the most likely it is figure
• Symmetry: A symmetrical region tends to be seen as a figure
• Parallelism: Regions with parallel contours tend to be seen as a figure.
• Extremal edges: If edges of an object are shaded such that it seems to recede in the distance, they tend to be seen as figure.

Question 7

True or False

We just need the following formula to perceive objects:

Structuralism + Committee Rules = Object perceived

Answer 7

False

Question 8

Face Inversion Effect

Answer 8

We are better at recognising faces that are upright.

Question 9

Global Superiority Effect

Answer 9

The properties of the whole object take precedence over the properties of parts of the object.

(You see the wholes instead of just its parts)

Question 10

Naive Template Theory

Answer 10

The proposal that the visual system recognises objects by matching the neural representation of the image with a stored representation of the same “shape” in the brain.

Question 11

True or False

Naive Template Theory works

Give an example to support your answer

Answer 11

False,

There is too many templates for the letter A

Question 12

Structural Description Theory

Answer 12

We recognise a particular organisation of simpler features.

Question 13

Geons

(Biederman)

Answer 13

Any object can be made out of a finite set of simpler geons (geometric ions).

Question 14

True or False

Geons and relationships between geons are viewpoint invariant

Answer 14

True

This is a problem.