Image Processing Basics - Digital Signal Processing: Fundamentals and Applications - page 763

14.25. What is the purpose of using interlaced scanning in a traditional NTSC TV system?

14.26. What is the bandwidth in the traditional NTSC TV broadcast system? What is the band-
width to transmit luminance Y, and what are the required bandwidths to transmit Q and I
channels, respectively?

14.27. What type of modulation is used for transmitting audio signals in the NTSC TV system?

14.28. Given the composite NTSC signal

Composite ¼ Y þ C ¼ Y þ I cos ð 2 pf sc tÞþQ sin ð 2 pf sc tÞ
show demodulation for the Q channel.

14.29. Where does the color subcarrier burst reside? What is the frequency of the color subcarrier,
and how many cycles does the color burst have?

14.30. Compare differences of the NTSC, PAL and SECAM video systems in terms of the number
of scan lines, frame rates, and total bandwidths required for transmission.

14.31. In the NTSC TV system, what is the horizontal line scan rate? What is the vertical

synchronizing pulse rate?

14.32. Explain which of the following digital video formats achieves the most data transmission
efficiency:
a. 4:4:4
b. 4:2:2
c. 4:2:0

14.33. What is the difference between interlaced scan and progressive scan? Which of the
following video systems use progressive scan?
a. CCIR-601
b. CIF
14.34. In motion compensation, which of the following would require more computation? Explain.
a. Finding the motion vector using sequential search
b. Recovering the target frame with the motion vectors and reference frame
14.35. Given a reference frame and target frame of size 80 80, a macroblock size of 16 16, and
asearchwindowsizeof32 32, estimate the number of subtractions, absolute value
calculations, and additions for searching all the motion vectors using the sequential search
method.
14.12.1 MATLAB Problems
Use MATLAB to solve Problems 14.36 to 14.42.
14.36. Given the image data “trees.jpg”, use MATLAB functions to perform each of the following
processes:
a. Use MATLAB to read and display the image.
b. Convert the image to grayscale.