Binary Images - RIT
Binary Images
u The simplest digital images are binary images. Binary images contain only one bit per pixel, so they can only represent two gray values. For example;
0 = black 1 = white
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0
Computer Memory & Storage
u If we want an image that has more than two gray levels, we have to increase the number of `bits per pixel'
binary: just white or black
grayscale: many shades of gray
Computer Memory & Storage
1 bit pixel
0 1 2 gray levels
2 bits pixel
0 0 0 1 1 0 1 1 2x2 = 4 gray levels
Computer Memory & Storage
0 0 0 0 0 1 0 1 0 3 bits 0 1 1 pixel 1 0 0 1 0 1 1 1 0 1 1 1 2x2x2 = 8 gray levels
Computer Memory & Storage
u We started to look at the bits as tokens to represent different values, but we ended up with a binary counting system.
u The largest number we can count to (and the number of different gray levels we can have) depends on how many bits we use.
000 = 0 001 = 1 010 = 2 011 = 3 100 = 4 101 = 5 110 = 6 111 = 7 ... = .
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