Information in Images
Information in Images <ul><li>We will find out: </li></ul><ul><li>How images are related to a binary data stream </li></ul...
Pixelated Images Image made of pixels Each pixel has more than just ‘on’ or ‘off’ setting… It has many different levels – ...
Bits and Bobs <ul><li>100011110100010101 </li></ul><ul><li>This is a bit stream </li></ul><ul><li>It represents a range of...
<ul><li>0 1 0 1 0 1 </li></ul><ul><li>6 5 4 3 2 1 </li></ul><ul><li>64 32 16  8  4  2 </li></ul>Bit Stream n 2 n This is a...
<ul><li>0 0 0 1 0 1 0 1 </li></ul><ul><li>8 7 6 5 4 3 2 1 </li></ul><ul><li>256 128 64 32 16  8  4  2 </li></ul>What are t...
 
 
 
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  1. 1. Information in Images
  2. 2. Information in Images <ul><li>We will find out: </li></ul><ul><li>How images are related to a binary data stream </li></ul><ul><li>How to calculate the information content of an ‘n’ bit binary number </li></ul><ul><li>Why logarithmic scales are used to sometimes represent numbers </li></ul><ul><li>100011110100010101 </li></ul>
  3. 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. 4. Bits and Bobs <ul><li>100011110100010101 </li></ul><ul><li>This is a bit stream </li></ul><ul><li>It represents a range of values of ‘zero’ or ‘one’ </li></ul><ul><li>Each number has a value – 2 n </li></ul>
  5. 5. <ul><li>0 1 0 1 0 1 </li></ul><ul><li>6 5 4 3 2 1 </li></ul><ul><li>64 32 16 8 4 2 </li></ul>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. 6. <ul><li>0 0 0 1 0 1 0 1 </li></ul><ul><li>8 7 6 5 4 3 2 1 </li></ul><ul><li>256 128 64 32 16 8 4 2 </li></ul>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

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