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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.