Embedded Files
input
input
Can provide running software with instructions on what to do.
can be data that must be processed.
Image capture
Image capture
Picture data - images/photos
image quality if NB - measured in pixels.
Digital cameras
Digital cameras
wide variety of sizes/prices/features
range:
smartphone
digital (compact) camera
top-end DSLR - Digital Single Lens Reflex
Advantages:
can take hundreds of photos (memory card size)
see images immediately and able to delete
transfer and edit - digital format
Point and shoot
Point and shoot
cant change lens
compact/everyday use
quick use without worry about tech settings
DSlr camera
DSlr camera
change lenses
professional use
more control over tech settings
Specs to determine quality:
Specs to determine quality:
megapixels
MP - the more pixels the better the quality.
lenses
lenses that be removed/changed for various photo options
sensor size
zoom
how far the camera is able to zoom in or out
resolution
ISO rating
high ISO rating - can take pictures in very low light without a flash.
Biometric input
Biometric input
Capturing unique, biological features.
EG: fingerprint
iris
used instead of passwords
used for access control (security)
Advantages
Advantages
Security
identity cannot be easily copied like cards/codes/passwords.
disadvantages
disadvantages
Expensive to implement/maintian
Needs additional hardware/software
SCANNERS
SCANNERS
Input device that scans image to a computer
main purpose to convert images/photos/docs into digital format
Examples:
photos
docs
body (MRI)
barcode - POS system
OCR software:
Optical Character Recognition - scan text documents, then able to edit in Word/app.
Quality of scanned images depends on:
Quality of scanned images depends on:
Resolution:
DPI - Dots per Inch
Greater DPI, the higher the number of pixels = better image quality.
higher DPI = larger file size
Colour Depth:
Number of different colours represented by a pixel.
24 bit colour - works for most images
higher colour depth = larger file size
black and white photos take less space than colour photos
advantages
advantages
scanned copies can be emailed directly
number plates of cars can be scanned by e-toll
QR codes - quick way to access websites
barcode scanner used in library / POS
old photos and docs can be scanned and saved electronically
scanned docs don't take up office space
mnay pages can be scanned into a single document
disadvantages
disadvantages
Takes a lot of time to scan
quality of scanned image depends on quality of hard copy
Input at atms
Input at atms
Automatic Teller Machine
dedicated device
gets input from user:
pin
transaction choice
card reader
card reader
insert bank card into ATM, machine reads magnetic strip for data
modem/network connection
modem/network connection
Must be able to connect to internet to check correct pin/balances for main branch
touch screen
touch screen
user simply touch buttons on screen to make transaction choice
money counter
money counter
ATM uses sensor to count number of notes to give to user
money deposit slot
money deposit slot
ATM uses sensor to count number of notes inserted into the machine
Advantages of atms
Advantages of atms
allow banking 24/7
not limited to your own bank to withdraw money
disadvantages of atms
disadvantages of atms
often dangerous (late at night)
Pin details/card can be stolen
input at pos system
input at pos system
Point of Sales system
makes use of barcodes and RFID (Radio Frequency Identification) tags - data stored on a tag and accessed wirelessly.
fast and reliable to identify the object
goals: better stock control and faster processing and pay point.
advantages of pos
advantages of pos
system works faster than typing prices - customers spend less time in shops/lines
prices can be updated and entered accurately
track sales
disadvantages of pos
disadvantages of pos
difficult to use when system is offline or loadshedding
expensive hardware and software is required
Touch screens
Touch screens
input, to interact with a computer by touching the screen instead of buttons.
can make use of a special pen - stylus
advantages of touch screens
advantages of touch screens
mores surface space on the device, no keyboard
keyboard on the screen is called a virtual keyboard
very little training needed to use
input such as gestures/drawing
disadvantages of touch screens
disadvantages of touch screens
typing is not as fast as typing on a keyboard
screen can become dirty
Data collection Devices:
Data collection Devices:
devices to capture data
sensors, cameras, signals
Examples:
meter reader - water
blood pressure / heart rate monitor
monitor tempreture pressure
Advantages
Advantages
data is captures automatically
data is captured more accurately (compared to human input)
data captured faster (compared to human input)
disadvantages
disadvantages
sensors can fail, resulting in incorrect data
devices can be expensive/difficult to upgrade
only sensor detectable data can be collected
input into smartphone and tablet
input into smartphone and tablet
user controlled input
user controlled input
touch screen
hardware buttons
camera
accelerometer - change of orientation of screen
microphone
system controlled input
system controlled input
GPS (Global Positioning System)
Wi-Fi (Wireless Fidelity), 3G
Siri - digitial voice assistant with Apple
Alternative Keyboards
Alternative Keyboards
using wired/wireless keyboards
virtual keyboard - onscreen keyboard
Wireless technology
Wireless technology
makes use of radio waves
wireless keyboard + mouse = bluetooth connection
Wi-Fi to connect to network and other computers
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