3D scanners scan solid objects and produce three-dimensional images by capturing x, y, and z coordinates of multiple points on the object's surface. These scans can be used in computer-aided design (CAD) programs for engineering and design work. 2D scanners are commonly used at airports to scan passports and capture traveler photos using optical character recognition and facial recognition technology. Computed tomography (CT) scanners build 3D images of solid objects through multiple thin "slices" captured using x-rays, radio frequencies, or other methods. Barcode scanners and readers use cameras and decoding software to interpret dark and light lines in barcodes as numeric data, allowing automatic identification and tracking of products and other

1. 5 points
5
4
3
2
1
Scanners/Barcode Reader
1. Three-dimensional scanners.
2. Application of 2D scanners at an
airport.
3. Application of 3D scanning –
computed tomographic (CT)
scanners .
4. Barcode readers/scanners.
5. Quick Response (QR) Code Readers

2. THREE-DIMENSIONAL SCANNERS
• 3D scanners scan solid objects and produce a three-
dimensional image.
• The solid objects have x, y and z coordinates, these
scanners take images at several points
along these three coordinates.
• The scanned images can be used in
COMPUTER AIDED DESIGN (CAD)

3. COMPUTER AIDED DESIGN (CAD)
• Computer have long been used in engineering
design
• Computer Aided Design (CAD) are software
programs for the design of product and
structures
• One Advantage of Computer Aided Design
(CAD) is that the product can be drawn in
three dimensions and then rotated on the
screen so the designer can see all the sides .

4. COMPUTER AIDED DESIGN (CAD)
• Examples of Computer Aided
Design (CAD) programs for
beginners are
Auto Sketch
Easy CAD2
Turbo CAD

5. Application
of
2D scanners

6. Application of 2D scanners at an
Airport
• 2D scanners are used at airports to read
passports .
• They make use of OCR technology to produce
digital images which represent the passport
pages
What is OCR ?
Optical
Character
Recognition

7. What is OCR ?
Device that reads preprinted characters in a
particular font and converts them into digital codes
Examples: Utility Bill
Price tag of department –store merchandise
The wand reader is common OCR scanning
Device .
Optical
Character
Recognition

8. Application of 2D scanners at an
Airport
• At many airports the two-dimensional
photograph in the passport is also scanned
and stored as a jpeg image. The passenger’s
face is also photographed using a digital
camera (a 2D image is taken so it can be
matched to the image taken from the
passport).

9. Application of 2D scanners at an
Airport
• Data such as:
• distance between the eyes
• width of the nose
• shape of the cheek bones
• length of the jaw line
• shape of the eyebrows
are all used to identify a given face.
• When the image from the passport and the image
taken by the camera are compared, these key positions
on the face determine whether or not the two images
represent the same face

10. Application
of
3D scanners

11. COMPUTED TOMOGRAPHIC (CT)
SCANNERS
• COMPUTED TOMOGRAPHIC (CT) SCANNERS are used to
create a 3D image of a solid object.
• This is based on TOMOGRAPHY technology which basically
builds up an image of the solid object through a series of
very thin ‘slices’ Together.
• These 2‘slices’ make up a representation of the 3D
solid object.
• Each slice is built up by use of X-rays, radio frequencies or
gamma imaging; although a number of other methods
exist. Each ‘slice’ is then stored as a digital image in the
computer memory. The whole of the solid object is
represented digitally in the computer memory.

12. A simple example of how tomography
work
https://www.youtube.com/watch?v=5_k6GVMwQ8w

13. Depending on how the image is formed, the type of
tomographic scanner can have different names.
For example:
X-rays CT scanners
Computerized Tomography
https://www.youtube.com/watch?v=l9swbAtRRbg
Radio Frequencies MRI
Magnetic Resonance Imaging
https://www.youtube.com/watch?v=nFkBhUYynUw
Gamma Rays SPECT
single photon emission computed tomography
https://www.youtube.com/watch?v=8TixuTUQte8
Watch
Videos

14. Barcode
Readers/Scanners

15. Barcode Readers/Scanners
• Difference Between Barcode Reader and
Barcode Scanner
Barcode Reader vs Barcode Scanner
• In common words there is no Difference
Between Barcode Reader and Barcode Scanner.
Because some people used to call barcode reader a
barcode scanner. So there is not much difference
between these two terms. One should not get
confused about their differences. It’s only what you call
it (a barcode reader) you can call it a barcode scanner
or barcode reader whatever you want.

16. Barcode Readers/Scanners
• A barcode is a series of dark and light parallel
lines of varying thickness. The
numbers 0 to 9 are each represented by a unique
series of lines. Various barcode
methods for representing these digits exist.
• The example we shall use adopts different
codes for digits appearing on the left and for
digits appearing on the right (known as
UPC(Universal Product Code)

17. Barcode Readers/Scanners
How Barcodes Work
https://www.youtube.com/watch?v=e6aR1k-ympo

18. How Barcodes Work

19. How Barcodes Work
https://www.explainthatstuff.
com/barcodescanners.html#:
~:text=You%20place%20the%
20item%20to,the%20item%20
in%20different%20directions.
Watch
Video

20. Read the following from text book
So what happens when a barcode is scanned?
Page 87
So the barcode has been read, then what
happens?
Page 88
Advantages of using barcodes
Page 88

21. Activity 5.1
A.
Using the data in Figure 5.6, design the barcodes
for:
i 9 0 0 3 4 0
ii 1 2 5 7 6 6 4 8
iii 0 5 8 8 9 0 2 9 1 8
B.
Look at some barcodes on a variety of products
and see how many fit the above system; for those
that don’t, try to draw up a table similar to that in
Figure 5.6 to show the barcode for each digit.
Solve it and submit
to me on Tues day
30th June

22. Solve it
Activity 5.2
Find out more about how barcodes can be used in a library. Consider
the types of files needed and how the system can track where books
are in the library, which books are out on loan, which customer has
borrowed a book
and so on.
Activity 5.3
Carry out some research and find out about as many different barcode
applications as you can. Try to find out why barcodes are used in each
application and determine the advantage of using this type of
technology.

23. Quick Response (QR)
Code Readers

24. QR CODE (QUICK
RESPONSE CODE) • A QR code (quick response
code) is a type of 2D
bar code that is used to
provide easy access to
information through a
smartphone. In this process,
known as mobile tagging, the
smartphone's owner points
the phone at a QR code and
opens a barcode reader app
which works in conjunction
with the phone's camera
QR code :Consider book Examples also

25. THANK YOU