Year 9 Image Representation

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 & Run Length Encoding

Click on the image to open the task.

There are 3 parts to the task:

Bitmaps
Black & White Run Length Encoding
Colour Run Length Encoding

Run length encoding means that instead of writing lots of binary we can encode using the Decimal system.

FOR FAST FINISHERS

Task 2.2

Nonograms Game

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.

⬇️ EoT 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

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;

understand that digital devices store data using just two states represented by binary digits (bits) PO3
debug simple algorithms and programs by identifying when things go wrong with their instructions and correcting them PO4
be able to explain why things went wrong and how they fixed them PO4
understand that digital devices represent data with binary digits and can detect errors in data storage and transmission PO4
understand how computers store more complex types of data using binary digits PO5

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