lec14 - ENGR 111 Lecture 14 Digital Information Reading...

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ENGR 111 Lecture 14 Digital Information Reading: Class notes, Chapter 33 Notes derived from Leon-Garcia’s book
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Bits, numbers, information z Bit: number with value 0 or 1 { n bits: digital representation for 0, 1, … , 2 n { Byte or Octet, n = 8 { Computer word, n = 16, 32, or 64 z n bits allows enumeration of 2 n possibilities { We can choose to give different meanings for each { Message consisting of n bits z The number of bits required to represent a message is a measure of its information content { More bits More content
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Digital Information z Text, images, audio and video can all be represented in binary (0s and 1s) z ASCII used for text { A = 01000001(65), B = 01000010(66),… { 1 = 00110001(49), 2 = 00110010(50),… { ! = 00100001(33), “ = 00100010(34),… z Images represented by pixels { Each pixel is represented by 3 numbers { Each number is intensity of primary colors R,G,B
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H W =++ H W H W H W Color image Red component image Green component image Blue component image Total bits = 3 × H × W pixels × B bits/pixel = 3HWB bits Example: 8 × 10 inch picture at 400 × 400 pixels per inch 2 400 × 400 × 8 × 10 = 12.8 million pixels 8 bits/pixel/color 12.8 megapixels × 3 bytes/pixel = 38.4 megabytes Color Image
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Block vs. Stream Information Block z Information that
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lec14 - ENGR 111 Lecture 14 Digital Information Reading...

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