HW1_solution

HW1_solution - EE4414 Multimedia Communication System II...

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EE4414 Multimedia Communication System II Homework 1 Solution (Analog Monochrome TV Systems), Yao Wang ___________________________________________________________________________________ 1. Describe the difference between progressive and interlaced scan. What is the advantage and disadvantage of interlaced scan compared with progressive scan, when the line rate per second (lines/s) is the same? With progressive scan, all lines are scanned within each frame. With interlaced scan, alternating lines (say even lines) are scanned in one field, and the rest (odd lines) are scanned in another field. The two fields together include all lines in one frame. When the line rate per second is the same, progressive scan has half the temporal sampling rate as the interlaced scan, but twice the vertical sampling rate (lines per frame). Thus interlaced scan can render fast moving objects better, but the progressive scan can render vertical details better. But when an object is moving very fast, the eye is not very sensitive to spatial details, and when the object is not moving, the two fields merge into one frame. Therefore, overall, interlaced scan enables faster temporal sampling, without sacrificing too much in perceived spatial resolution. 2. What are some of the factors that determine the minimal required frame rate (frames/s) and line number (lines/frame) for the eye not to see separate frames or lines? The minimal frame rate and line number depend on viewing distance, display brightness, as well as
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This note was uploaded on 01/22/2012 for the course EE 4414 taught by Professor Wang during the Fall '07 term at NYU Poly.

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HW1_solution - EE4414 Multimedia Communication System II...

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