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Transcript

  • 1. Information in Images
  • 2. Information in Images
    • We will find out:
    • How images are related to a binary data stream
    • How to calculate the information content of an ‘n’ bit binary number
    • Why logarithmic scales are used to sometimes represent numbers
    • 100011110100010101
  • 3. Pixelated Images Image made of pixels Each pixel has more than just ‘on’ or ‘off’ setting… It has many different levels – this is dependent on the number of bits
  • 4. Bits and Bobs
    • 100011110100010101
    • This is a bit stream
    • It represents a range of values of ‘zero’ or ‘one’
    • Each number has a value – 2 n
  • 5.
    • 0 1 0 1 0 1
    • 6 5 4 3 2 1
    • 64 32 16 8 4 2
    Bit Stream n 2 n This is a 6-bit number – it has a maximum of 2 6 = 64 possible values The actual value above is 21 – can you see why? What are the number of possible values with 8-bits?
  • 6.
    • 0 0 0 1 0 1 0 1
    • 8 7 6 5 4 3 2 1
    • 256 128 64 32 16 8 4 2
    What are the number of possible values with 8-bits? There are 256 values – 0 to 255 or 2 8 Binary numbers are to the base 2 – written log 2
  • 7.  
  • 8.  
  • 9.  

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