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Intro to Multimedia > Week 1 - Perception & Images > Flashcards

Week 1 - Perception & Images Flashcards

1
Q

What is Multimedia?

A

• Using more than one medium of expression, communication.

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2
Q

An interactive computer-mediated presentation that includes at least two of the following:

A
  • Text
  • Sound
  • Still graphic images
  • Motion graphics
  • Animation
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3
Q

What two functions do multimedia computers serve?

A
  • Development tools for the creation of multimedia productions e.g. Adobe, Apple, Microsoft, Unity.
  • Delivery devices for multimedia applications
  • Browsers or player applications.
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4
Q

What is Perception?

A

The consciousness or awareness of objects or other data

through the medium of the senses.

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5
Q

What is the Electromagnetic Spectrum?

A

• Wide range of

waveforms known as the electromagnetic spectrum.

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6
Q

What is the speed of light?

A
  • Electromagnetic waves travel at the speed of light
  • c = 299,792,458 m/s
  • c = fλ
  • 299,792,458 m/s / 1,800,000,000Hz = 0.17m
  • 0.17m is the wavelength (λ) of what?
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7
Q

What 3 things is the power of light measured by?

A
  • Radiance (watts)
  • Luminance (lumens)
  • Brightness
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8
Q

What is Radiance (watts)?

A

• Total amount of energy emitted

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9
Q

What is Luminance (lumens)?

A

• Light strength that is perceived by

the human eye

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10
Q

What is Brightness?

A

• Subjective measure of how bright an object

appears to be

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11
Q 
State the order of the electromagnetic spectrum highest energy to lowest energy.
• G
• X
• U
• V
• I
• M
• U
• R
A
  • Gamma rays
  • X-rays
  • Ultra-violet
  • Visible
  • Infra-red
  • Micro-waves
  • UHF/VHF/TV
  • Radio waves
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12
Q

Which electromagnetic element has the highest energy but shortest wavelength?

A

• Gamma rays

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13
Q

Which electromagnetic element has the lowest energy but longest wavelength?

A

• Radio waves

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14
Q

What is the wavelength of visible light between?

A

• 400-700 nanometers

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15
Q

State the 2 light-receptor cells in the retina?

A
  • Rods

* Cones

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16
Q

What are rods in the retina?

A
  • Detect shades of black & white.
  • In the peripheral vision.
  • Work in low light - night vision.
  • Approx 120 million of them.
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17
Q

Describe cones in the retina?

A
  • Sensitive to colour.
  • Mainly central.
  • Only work in bright light.
  • Only sensitive to RGB.
  • Approx 6-7 million
18
Q

Humans are tri -_________ & respond to light in bands of RGB.

A

• Tri-chromatic

19
Q

What are active sources of colour?

A

• Emitting different wavelengths of light

e.g. from monitors/projectors.

20
Q

What are passive sources of colour?

A

• Absorbing some wavelengths & reflecting others.

e.g. from printed documents

21
Q

What are the primary colours of active displays?

A
  • Red
  • Green
  • Blue
22
Q

What are the primary colours of passive displays?

A
  • Cyan
  • Magenta
  • Yellow
23
Q

On a white background which colours of RGB are absorbed?

A

• None of the colours

24
Q

On a cyan background which colours of RGB are absorbed?

A

• Red

25
Q

On a Magenta background which colours of RGB are absorbed?

A

• Green

26
Q

On a Yellow background which colours of RGB are absorbed?

A

• Blue

27
Q

What is the intensity of each RGB colour to the eye?

A

• Red - 0.299
• Green - 0.587
• Blue - 0.114
=1

28
Q

What is the Colour Gamut?

A 
• Specifies the  ranges of colours 
that can be produced by a 
particular display
• Film Gamut
• Monitor Gamut
• Printer Gamut
29
Q

What 3 things do human eyes respond to more than just dominant wavelength?

A
  • Luminance or brightness
  • Excitation purity or saturation
  • The chromaticity or hue of light
30
Q

State the 3 psychophysical models?

A
  • Hue - pure dominant colour
  • Lightness
  • Saturation - how much the colour is diluted by white light
31
Q

What is the HSV colour model?

A

• Mainly refers to the saturation and dominance of hue in the colour.

32
Q

Describe digital images?

A
  • Composed of pixels

* Picture resolution is no. of pixels used to make up image.

33
Q

Another word for digital images?

A

• Bitmap images

34
Q

Describe resolution?

A
  • Amount of detail

* Storage requirements

35
Q

What is the approx resolution compact cameras take?

A

• 10-24 megapixels

36
Q

Describe aspect ratio?

A

• no. of horizontal pixels x vertical pixels

37
Q

How are images stored?

A
  • Pixels in images are assigned numerical values to store colour information.
  • 0 or 1
38
Q

Colour values range from?

A

• 0-255

39
Q

Describe true colour?

A
  • High quality

* Requires more memory

40
Q

Describe palette colour?

A
  • Limited numbers of colors

* Enables easier implementation of certain techniques

Intro to Multimedia (11 decks)

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