Lecture 4 - Interaction Challenges - Occlusion

Question 1

What is occlusion?

Answer 1

Screen is covered during touch input.

-> targets can’t be seen during touch input
-> 2 types = under finger or under the rest of the hand or limb

Question 2

What is the easiest way of dealing with occlusion?

Answer 2

Re griping

Question 3

What is the shift input technique?

Answer 3

When a bubble appears showing what is underneath the fingertip (shows the precise cursor).

Question 4

What are the advantages of the shift input technique?

Answer 4

• allows for precise selection of small targets

Question 5

What is the alternative version of the shift input technique?

Answer 5

Dragging the finger down while being able to control the previous location. (implemented in IOS)

Question 6

What is the back of device input?

Answer 6

A separate device mounted at the back of the mobile device, as to decouple the input/output nature of the touchscreen, which allows small target selection.

Question 7

Advantages of the back of the device input?

Answer 7

• allows for precise input
• can shrink the device, while having no issue of occlusion