SBEE 1718III/BEE4213 CONFIDENTIAL QUESTION 5 (a) Explain TWO (2) types of scanni
ID: 3348820 • Letter: S
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SBEE 1718III/BEE4213 CONFIDENTIAL QUESTION 5 (a) Explain TWO (2) types of scanning technique used for television and display devices. 4 Marks] [CO1, PO1, C2] (b) For each of the techniques, give ONE advantage respectively. 2 Marks] ICo1, PO1, C2) (c) You are looking for a new television at SonHong electrical shop. Finally you find an LCD TV with specification of 1080p with the aspect ratio of 16:9. If you are looking for a TV with screen resolution more than 2.2million pixels, should you buy this TV. (Show caloulation to proof your answer) 4 Marks] CO1, PO1, C2]Explanation / Answer
a) Two types of scanning techniques are there, interlaced and progressive techniques.
1) Interlaced scanning- it is a scanning type in which half of the horizontal frame is displayed in one cycle and another half of the frame is in second half. Therefore it requires two cycle to display image, for example 1080i where i is interlaced.
2) Progressive Scanning- progressive scan display each line in sequence to form image. Therefore it send two times much data as compared to interlaced type scanning. For example 1080p full HDTV.
b)
1) for interlaced scanning, as it displays frames in two cycle therefore it takes less bandwidth.
2) progressive scanning reduces flickering which occurs in interlaced scanning.
c) if we consider 1080p means it is a progressive scan type, where, 1080p indicates full HDTV, hence 1920x1080=2073600 which is about 2.1 megapixel. But our requirement is more than 2.2 megapixel. Therefore we can not select it.
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