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Digital Images and Binary Code

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Rory Mc Caughey

on 19 April 2014

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Transcript of Digital Images and Binary Code

Digital Images and Binary Code
Digital Images
If we were to use Binary code to shade a picture on your grid...
Remember 0 = Off
1 = On
The code would be incredibly long and in efficient

Instead we use the data Compression method, or run-length coding.

Your Task!
Recap on Binary Code
What is Binary Code?

What digits are important in Binary Code?

How is Binary Code used to represent text?

Is text the only type of data that digital systems represent?
How is this image shown on your screen?
Some Questions to think about?
Digital Images
Text is not the only type of data represented on digital systems e.g computers.

Pictures, moving images, and sound are all represented using Binary Code.

To identify how this happens let's do an investigation into how some early digital images were transferred.

What is this device?

What is it's job?
Use the run-length coding on the board to create an image on your grid.

What picture have you drawn?

Check with a partner to see if you have the same image

Now you know a coding system for displaying lack and white pictures!

We have learnt about coding for black and white pictures, how might you digitally represent colour pictures e.g. in .jpeg format?

Pictures can be taken in different resoultions, what will this mean for their coding and file size?

What about moving images? Videos etc?
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