← ACARA Digital Technologies Years 5–6

Spotting patterns in an encoded image

Something that repeats or mirrors in an image code, like matching rows, a symmetrical picture or a run of the same digit. You can spot it and describe it in words.

Part of: ACARA Digital Technologies Years 5–6 — Representing Data with Numbers — Module 13

Understanding Spotting patterns in an encoded image in ACARA Digital Technologies Years 5–6

What it does: The row has a run of four 1s and then a run of four 0s, which is a pattern of same-digit runs. The digits alternate between 1 and 0, and you can describe this in words as a pattern. All four rows are exactly 0110, so the row repeats. Spotting repeating rows is one way to find a pattern. 1001 reads the same backwards. 1011 backwards is 1101, so it is not a mirror. Row 1 matches row 5 and row 2 matches row 4, so the picture is symmetrical top to bottom. The rows are not all the same.

Common mistakes: The pattern says all rows repeat, so row 2 must match the others. It should be 0110, not 0111. For a picture that mirrors left to right, each row reads the same backwards. 00110 does not, so row 3 should be 00100.

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This module's key terms are also in a printable crossword (Modules 44–57) and word search (Modules 44–71).

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Learning

Duo

A pixel image code has these rows: 0110, 0110, 0110, 0110. What pattern can you spot?

Every row is the same (repeating rows)Every row is different

Matches

Row 1: 0110 Row 2: 0110 Row 3: 1001 'All three rows repeat.'

↓

Row 3 is different from rows 1 and 2, so only the first two rows repeat. The claim should say 'rows 1 and 2 repeat'.

Applying

Meanings

Term

pattern

Meaning

Something that repeats or mirrors in an image code, like matching rows, a symmetrical picture or a run of the same digit. You can spot it and describe it in words.

Practice

00100

Testing

Gaps

Row 3:

Check Answer

Spots

1Row 1: 0110

2Row 2: 0111

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Quick Questions

1. A pixel image code has these rows: 0110, 0110, 0110, 0110. What pattern can you spot?

A. Every row is the same (repeating rows) ✓

B. Every row is different

All four rows are exactly 0110, so the row repeats. Spotting repeating rows is one way to find a pattern.

2. Which row is symmetrical, meaning it reads the same from left to right and right to left?

A. 1011

B. 1001 ✓

1001 reads the same backwards. 1011 backwards is 1101, so it is not a mirror.

3. A row of an image is 1111110000. Which description fits best?

A. The digits swap every time: 1, 0, 1, 0

B. A run of six 1s followed by a run of four 0s ✓

A run is a group of the same digit in a row. This row has two runs, and runs are easy to spot and describe.

4. An image has these rows: 00100, 01110, 11111, 01110, 00100. Which sentence describes a pattern?

A. The rows mirror each other from top to bottom ✓

B. The rows are all exactly the same

Row 1 matches row 5 and row 2 matches row 4, so the picture is symmetrical top to bottom. The rows are not all the same.

5. Which is a good way to describe a pattern in words?

A. Rows 1 and 3 are the same, and row 2 is all 1s ✓

B. It looks kind of nice

A good description is clear and points to the rows or digits that repeat or mirror.

Match the Pairs

0110 0110 0110 → Repeating rows: the same row of digits is used again and again, so the picture has stripes.

1001 0110 1001 → A symmetrical picture: the rows mirror each other, so the top row matches the bottom row.

A run of the same digit is a pattern: a long stretch of one digit in a row. → 11110000

A pattern can be described in words, such as 'the digits swap between 1 and 0 every time'. → 10101010

Row 1: 0110 Row 2: 0110 Row 3: 1001 'All three rows repeat.' → Row 3 is different from rows 1 and 2, so only the first two rows repeat. The claim should say 'rows 1 and 2 repeat'.

0111 1110 'This row is symmetrical.' → A symmetrical row reads the same forwards and backwards. 0111 backwards is 1110, so the row is not symmetrical.

Key Term

pattern

Something that repeats or mirrors in an image code, like matching rows, a symmetrical picture or a run of the same digit. You can spot it and describe it in words.

Fill in the Blanks

1. Row 1: 1001 Row 2: 1001 Row 3: 1001

Hint: Type the row of digits that keeps repeating the rows above it.

2. Symmetrical row: 1100 then 0011

Hint: Type the mirror image of the left half so the row reads the same both ways.

3. 1110000 has a run of four 0s

Hint: Type the digit that appears four times in a row.

4. Row: 1100 0011 Left mirrors right, so it is symmetrical

Hint: Type the word that describes a picture whose two sides mirror each other.

5. 01010101 repeats the pair 01 four times

Hint: Type the short pair of digits that repeats to make the whole row.

Spot the Error

Question 1

A Row 1: 0110

B Row 2: 0111

C Row 3: 0110

D Pattern: all rows repeat

Line B — The pattern says all rows repeat, so row 2 must match the others. It should be 0110, not 0111.

Question 2

A Row 1: 10001

B Row 2: 01010

C Row 3: 00110

D Row 4: 01010

E Pattern: left mirrors right

Line C — For a picture that mirrors left to right, each row reads the same backwards. 00110 does not, so row 3 should be 00100.

Question 3

A Row 1: 11100000

B Run of 1s: 4

C Run of 0s: 4

Line A — The notes say there is a run of four 1s and a run of four 0s. The row should be 11110000, with four 1s then four 0s.

Question 4

A Row 1: 101

B Row 2: 110

C Row 3: 010

D Rows 1 and 2 repeat

Line B — The last line says rows 1 and 2 repeat, so row 2 must be the same as row 1. It should be 101.

Question 5

A Row: 000111

B Run 1: three 0s

C Run 2: four 1s

Line C — The row 000111 ends with a run of three 1s, not four. The line should say 'Run 2: three 1s'.

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