ACARA 5-6 Digital Technologies: Binary and pixel images
Students learn that digital systems store data as numbers, that binary uses only 0 and 1 as off and on states, and how to encode, decode and compress black-and-white and greyscale pixel images.
One content description (AC9TDI6K03, AC9TDI6K04) from the full ACARA Digital Technologies Years 5–6 — Representing Data with Numbers journey. All 19 modules below are in that journey too, with the same content — add just these to a class, or the whole strand.
Modules (19)
1
Digital systems store everything as numbers
2
Types of data: images, sound and video
3
Binary means two states
4
Bits and the binary digits 0 and 1
5
On and off switches in everyday things
6
Encode and decode
7
A binary alphabet with two symbols
8
Representing images with pixels
9
Reading a pixel grid row by row
10
Encoding a black-and-white image as 0s and 1s
11
Decoding 0s and 1s into an image
12
One wrong digit changes the picture
13
Spotting patterns in an encoded image
14
Run-length encoding of a pixel image
15
Decoding run-length counts back into pixels
16
Why run-length encoding saves space
17
One bit gives two colours
18
Two bits give four shades: greyscale
19
More colours need more binary digits
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