2D scanner

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Date:

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Quick Questions

Shade in the A or B circle for each question.

1. Which statement describes how a 2D scanner captures a page?

A A laser burns the image into the paper and stores a copy as text

B A light and sensor move across the page and read the light reflected from it

2. A student wants to turn a printed photograph into a digital file. Which device is the best fit?

A 2D scanner

B Speaker

3. How is the image stored after a 2D scanner captures it?

A As a grid of pixels

B As a single sound wave

4. What does optical character recognition (OCR) do?

A Makes the scanned image print faster

B Turns the scanned image of printed text into editable text

5. Which type of 2D scanner has a flat glass bed where you lay the document face down?

A Flatbed scanner

B Barcode scanner

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1flatbed scanner		AA scan is only an image made of pixels. OCR software is needed to recognise the letters and turn them into editable text.
2OCR		BA 2D scanner where the document or photo lies face down on a glass plate while a light and sensor move beneath it
3A 2D scanner shines light onto the page, and the reflected light is read by a sensor		COptical character recognition: software that turns the scanned image of printed text into text that can be edited
4The scanned image is stored as a grid of tiny coloured squares called pixels		Dlight -> page -> reflects -> sensor
5A 2D scanner outputs a printed copy of the page		Eimage = grid of pixels
6Scanned text is automatically editable without OCR		FA scanner is an input device, not an output device. It captures a digital image of the page and sends it into the computer. A printer produces paper copies.

Definitions

2D scanner

Fill in the Blanks

Complete each line of code by filling in the missing parts.

image ← ____(page)

text ← ___(image)

reflected ← ______.read(page)

pixelCount ← width * ______

IF type = "text" ____ text ← OCR(image) ENDIF

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A INPUT page ON glass

B light ← MOVE ACROSS page

C sensor ← READ reflected sound

D image ← SAVE AS pixels

Question 2

A OPEN lid

B PLACE photo FACE DOWN

C CLOSE lid

D PRESS print

Question 3

A image ← SCAN(letter)

B text ← OCR(image)

C text ← EDIT(text)

D SAVE image AS editable text

Question 4

A FOR each point on page

B colour ← READ(point)

C STORE colour AS letter

D NEXT point

Question 5

A device ← FLATBED

B dimensions ← 3D

C OUTPUT dimensions

Answer Key

2D scanner

Section A: Quick Questions

B — A light and sensor move across the page and read the light reflected from it

A — 2D scanner

A — As a grid of pixels

B — Turns the scanned image of printed text into editable text

A — Flatbed scanner

Section B: Match the Pairs

flatbed scanner → A 2D scanner where the document or photo lies face down on a glass plate while a light and sensor move beneath it

OCR → Optical character recognition: software that turns the scanned image of printed text into text that can be edited

A 2D scanner shines light onto the page, and the reflected light is read by a sensor → light -> page -> reflects -> sensor

The scanned image is stored as a grid of tiny coloured squares called pixels → image = grid of pixels

A 2D scanner outputs a printed copy of the page → A scanner is an input device, not an output device. It captures a digital image of the page and sends it into the computer. A printer produces paper copies.

Scanned text is automatically editable without OCR → A scan is only an image made of pixels. OCR software is needed to recognise the letters and turn them into editable text.

Section C: Definitions

2D scanner — An input device that moves a light and sensor across a flat page or photo, reading the reflected light to capture a digital image made of pixels.

Section D: Fill in the Blanks

image ← SCAN(page)

text ← OCR(image)

reflected ← sensor.read(page)

pixelCount ← width * height

IF type = "text" THEN
    text ← OCR(image)
ENDIF

Section E: Spot the Error

C — A 2D scanner's sensor reads reflected light from the page, not sound. Line 3 should be: sensor ← READ reflected light.

D — To capture a digital image you press scan. Printing is done by a printer, which is an output device. Line 4 should be: PRESS scan.

D — The scanned image is only pixels and is not editable. OCR creates the editable text, so the text variable should be saved. Line 4 should be: SAVE text AS document.

C — A scanned image is saved as pixels, each holding a colour. It is not stored as letters. Line 3 should be: STORE colour AS pixel.

B — A 2D scanner captures a flat image of a flat page or photo. Capturing 3D shapes needs a 3D scanner. Line 2 should be: dimensions ← 2D.