Polytechnic University, Dept. Electrical and Computer Engineering
EE4414 Multimedia Communication System II
Fall 03, Yao Wang
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Homework 3 (Video digitization, format conversion)
Reading Assignment:
 Lecture slides
 Y. Wang, et al. Video processing and communications (mainly Sec.1.5; Optional: Chapters 3,4)
Written Assignment
1. What are the factors considered when choosing the sampling rate for digitizing a raster video?
2. Why is that we can and want to sample chrominance components at a lower sampling rate than
luminance? What are the differences between the color formats 4:4:4, 4:2:2, 4:1:1, 4:2:0?
3. The figure below show two interlaced video frames.
a. Generate the field data associated with each frame.
b. Deinterlace field 1 of frame 2 using field averaging. Write down the deinterlaced field.
c. Now try line averaging. Write down the deinterlaced field.
d. Now try field and line averaging. Write down the deinterlaced field.
e. For this simple example, which method is better?
f. In general, what are the pros and cons of different methods?
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Frame 1
Frame 2
4. The course website provides a sample matlab script that implements different deinterlacing
methods. Go through the code to try to understand the operations involved.
5. Optional: use the sample deinterlacing matlab code on some test sequences and observe
differences of different deinterlacing method.