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Hong Kong University of Science & Technology
Department of Electrical & Electronic Engineering

Fall 2001 ELEC 360: Digital Media & Multimedia Applications Mansun Chan
Name: ___Solution______________ E-mail: ___________________________
Quiz #2 (October 09, 2001)
1. Explain what the following filters do?
0.11 0.11 0.11
0.11 0.11 0.11
0.11 0.11 0.11

0 -2 0
0 4 0
0 -2 0

___Blurring________ __Horizontal Edge Detection___
2. For 3 black/white images with the following given pixel histogram,

A B C
(a)
Which one has the highest contrast?

(A)

(b)
Which one is the brightest?


(B)
3. Explain the difference between composite video and component video
Composite Video: The YCRCB channels are mixed together before sampling and D/A conversion
Component video: The YCRCB channels are sampled and D/A converted individually before sampling and combined together in the digital domain
4. In a video standard with 500 horizontal scan lines. If it conforms to a 4:3 aspect ratio and its Kell factor is 0.6, what is the vertical and horizontal resolutions defined by this video standard? Vertical resolution = 500 x 0.6 = 300 equivalent pixel Horizontal resolution = 300 x 4/3 = 400 equivalent pixel
5. For a 4:2:2 sampling system as shown in the diagram, if the Luminance is sampled at 720x486, at what resolution are the chrominances sampled?

360 x 486