# Information in images

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• Created by: apple87
• Created on: 25-04-15 14:20
How many bits in a byte?
8
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What is the formula used to calculate the number of bits?
Number of alternatives= log2(number of alternatives)
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What is the formula to calculate the Number of alternatives?
Number of alternatives= 2Number of bits
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How can the brightness of an image be changed?
By adding a fixed positive value to the binary numbers which makes the image brighter but doesn't change the contrast.
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How can the contrast of an image be changed?
Multiply the binary numbers by a fixed value, increases the contrast an brightness.
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What does adding false colour do?
Highlights features.
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How can noise in an image be reduced?
Replace pixles with the median of it's eight neighbours.
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What does noise look like in in image?
A bright or dark spot.
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What is the result of reducing noise?
Any odd values are removed and the image is smoother.
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What is the Laplace rule used for?
To find edges.
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How do you apply the Laplace rule?
Muliply a pixle by four, then subract the value of the pixels immediately above, below, to the left and to the right.
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When will the Laplace rule highlight an edge?
If there is a steep change in brightness.
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If the change in brightness is gradual what will happen when the Laplace rule is applied?
It will smooth the change in brightness, making it less noticeable.
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## Other cards in this set

### Card 2

#### Front

What is the formula used to calculate the number of bits?

#### Back

Number of alternatives= log2(number of alternatives)

### Card 3

#### Front

What is the formula to calculate the Number of alternatives?

### Card 4

#### Front

How can the brightness of an image be changed?

### Card 5

#### Front

How can the contrast of an image be changed?