Year 9 Image Representation


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How do computers form images, how do they send images from one place to another? If you completed the last topic, you will know it has something to do with Binary, but how do you send a picture with binary and how do you turn it back into an image?

LEARN THE FUNDAMENTALS OF IMAGE REPRESENTATION

Task 2.1

Bitmaps

Click on the image to open the task.

In order to calculate the Hex values use this converter https://www.rapidtables.com/convert/number/hex-to-binary.html

Task 2.2

Sending Images!

Click on the image to open the task.

Instead of writing lots of binary we can encode using the Decimal system. 

This is done by alternating numbers that represent the number of white squares then black squares and repeats.

You can also use this tool to help you 

Task 2.3

Colour Graphics!

Click on the image to open the task.

This task will teach you how you encode colour.

Task 2.4

Nonograms Game for Fast Finishers

https://nonograms-katana.com/play/

Once you push PLAY start with Black and White Nonograms and a 5x5 grid. 

Then you can try others once you have the hang of it.

Sign up to keep your progress.

IMAGE REPRESENTATION ASSESSMENT  

Complete the EoT Image Representation Quiz

It may be helpful to use the Binary Card Simulator and Run Length Encoder

FURTHER RESOURCES

2.Extra - Egypt Large Scale

This is a larger picture with lots of colours. If you are racing ahead try and complete this large scale version.

Click on the image to open the task.

2.Extra - Make your own

Make your own picture and write the lookup code

Click on the image to open the task.

Barcodes and QR Codes

Pictures can also be used to store information. Barcodes and QR codes are common examples. Barcodes are reasonably straight forward with each number being represented by a different combination of black and white lines. QR codes on the other hand store binary numbers and are a bit more complicated. For more information see here. For a full hand solve of a QR code check out here (note there is some mild swearing).

Example QR code from Wikipedia

NZ CURRICULUM

Digital Technologies | Progress Outcomes

COMPUTATIONAL THINKING FOR DIGITAL TECHNOLOGIES

At the end of this topic students will have had the opportunity to cover;