Lecture 4

Question 1

Perception

Answer 1

Perception is defined as the process of
Recognizing –being aware of
Organizing – gathering and storing
Interpreting – binding to knowledge

Question 2

Illusion

Answer 2

Visual representations of objects are often misinterpreted, either because they do not match our perceptual system, or they were intended to be misinterpreted.

Illusions are a primary source of such misinterpretations.

Figures 1 and 2 highlight our inability to notice visual problems except on more detailed perusal. The drawings are those of physically nonrealizable objects. Sometimes the ambiguity presented is easily seen, but more difficult to explain. Sometimes it is not even perceived.

Question 3

Preattentive Processing

Answer 3

Done by low level visual system
Intuitive in nature
Normally done between 200msec – 250msec
Little focus and little time required

Question 4

Variables of Visual Encoding

Answer 4

Texture
Color
Orientation
Shape

Question 5

Motion

Answer 5

The use of motion is common in certain areas of visualization, for example, the animation of particles, dye, or glyphs to represent the direction and magnitude of a vector field (e.g., fluid flow visualization).

Question 6

Animation

Answer 6

Animation is the technique of photographing successive drawings or positions of puppets or models to create an illusion of movement when the movie is shown as a sequence.