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Grade 11 CAT - Input and Output - Summary
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Grade 11 CAT - Input and Output - Summary
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INPUT AND OUTPUTModule 1.2
Input
Input can:
Provide the running software with instructions on what to do next
Be data that must be processed
Images can be Captured using: Scanners
Cell phones Input device that scans images to a
Consumer tablets computer
Laptops Bar codes, photographs, documents and
Point and shoot cameras 3D objects
The high-end camera equipment
The quality of an image produced by a scanner is affected by two things:
Resolution
DPI (dots per inch)
The greater the DPI the greater the number of pixels
Higher the DPI the larger the resulting image file
Software gives you option of specifying the resolution
Colour Depth
Number of different colours that can be represented by a pixel
24 Bit colour (About 16.7 million colours) is best quality colour depth
Higher the colour depth, larger the resulting image file
Advantages of Scanners
Large documents into single digital file Old (printed) family photos scanned and
The electronic copies stored digitally shared digitally
Scanned copies emailed directly instead Barcode scanners libraries and Point of
of having to be faxed Sale (POS) systems
Old documents scanned and stored for We can scan documents that contains
future generations text as an image and use OCR software
, INPUT AND OUTPUT
Module 1.2
Input
Disadvantages of Scanners
Scanning can be slow - depends on the type of scanner and its purpose
The quality of the digital image depends a lot on the quality of the original hardcopy
Digital Cameras
Cell phone cameras
Digital (compact) cameras
Top end (DSLR - Digital Signal Lens Reflex) cameras used by hobbyists and professionals
Advantages and Disadvantages of a Digital Camera:
Before…
Images could only be caught using film cameras
Used light sensitive film material (12, 24 or 36 Images)
Use entire film before processing at shop
Had to pat for every photo
To edit image on computer it had to be scanned first
After…
Digital camera takes hundreds or thousands of photos
Images can be seen immediately
Images are easily transferred to computer to edit
Cheap and easy to use everywhere
Specifications of Digital Cameras
Point and Shoot vs DSLR Cameras
Sensor size
3x Optical zoom vs 5x Digital zoom
Resolution
ISO Rating
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