Shared Flashcard Set

Details

Human-Computer Interaction 14
HCI at University of Z├╝rich
25
Computer Science
Undergraduate 1
01/06/2017

Additional Computer Science Flashcards

 


 

Cards

Term
What kind of interaction devices are there?
Definition
[image]
Term
What is an input device?
Definition
Tansducer that senses physical properties of people, places or things
Term
What is an interaction technique?
Definition
Fusion of input and output, consisting of all hardware and software elements, that provides a way for the user to accomplish a task for a particular conceptual model
Term
Characteristics of input devices
Definition
- Physical properties sensed
- Number of dimenstions
- Direct vs indirect inputs
- States sensed
- Transfer functions
- Other characteristics (sampling rate, footprint, homing time..)
Term
Physical properties sensed
Definition
[image]
Term
What is a relative positioning device?
Definition
use displacement vector as input signal -> turning computer off and on - > always starts at 0
Term
Direct vs. Indirect
Definition
Direct input devices unify input and display surfaces
Indirect input devices have separate input and display surfaces
Term
Advantages/disadvantages of indirect input devices
Definition
+ no occlusion
+ can have higher precision
+ scales better for large output screens
- Requires explicit representation (cursor)
Term
Graphical input devices can be modeled with which three states?
Definition
State 0: no effect, State1: Move cursor, State 2: Activate
e.g. mouse: state 0: not moving the mouse, state 1 move cursor, state 2, button down (can still move cursor)
Term
From input signal to output
Definition
[image]
Term
Proprioception
Definition
sense relative position of neighboring parts in the body. e.g. feeling the position of own finger after moving on a trackpad
Term
Extrerioception:
Definition
sense outside stimuli
- Feedback actively produced by the computer, e.g. seeing the cursor move
- Feedback from the physical form of the manipulandum, e.g. feeling the solid surface of the trackpad
Term
Transfer function
Definition
Mathematical relationship between input space and display space
- Identical transformation I(x), e.g., touch screens
- Linear transformation, e.g. mouse, trackpad
Term
CD gain
Definition
Control-display gain
[image]
Term
Pointer acceleration
Definition
dynamically changing CD gain according to the movement velocity
primary submovement -> fast -> trigger high CD gain -> quickly cover a distance
secondary submovememtn -> slow -> trigger low CD gain -> precise cursor control
Term
how we move while pointing?
Definition
primary submovement: ballistic (don't use visual feedback for adjusting the course), relatively high velocity
secondary submovemet: corrective, use visual feedback, relatively low velocity
Term
Formally representing input devices: primitive movement vocabulary
Definition
[image]
Term
What does the M stand for in the primitive input device formula? What are the possibilities?
Definition
[image]
Term
What does ln and Out stand for in the primitive input device formula?
Definition
[image]
Term
What does the S, R stand for in the primitive input device formula?
Definition
[image]
Term
What the W stand for in the primitive input device formula?
Definition
[image]
Term
What is the second possibility to formally represent input devices?
Definition
composition operators
[image]
[image]
Term
Composition operators shown graphically
Definition
[image]
[image]
Term
What is the use of a design space of input devices?
Definition
[image]
Term
How is speed measured in text entry devices?
Definition
[image]
Supporting users have an ad free experience!