ALLAMA IQBAL OPEN UNIVERSITY, ISLAMABAD
(Department of Computer Science)
WARNING
PLAGIARISM OR HIRING OF GHOST WRITER(S) FOR SOLVING THE ASSIGNMENT(S) WILL DEBAR THE STUDENT FROM AWARD OF DEGREE/CERTIFICATE, IF FOUND AT ANY STAGE.
SUBMITTING ASSIGNMENT(S) BORROWED OR STOLEN FROM OTHER(S) AS ONE’S OWN WILL BE PENALIZED AS DEFINED IN “AIOU PLAGIARISM POLICY”.
Course: Introduction of ICT (1431 / 9421) Semester: Autumn, 2021
Level: ADC/ADE/BS/BEd
Please read the following instruction for writing your assignments. (AD, BS, BEd, MA/MSC, MEd, MPhil and PhD)
All questions are compulsory and carry equal marks but within a questions the marks are distributed according to its requirements
Read the questions carefully and then answer it according to the requirements of the question.
Hand written scanned assignments are not acceptable
Upload your typed (in Word or PDF format) assignments on or before the due date.
Late assignments can’t be uploaded on LMS.
Your own analysis and synthesis will be appreciated.
Avoid irrelevant discussion/information and reproducing from books, study guide or allied material
ASSIGNMENT No. 1
(Unit 1–4)
Total Marks: 100 Pass Marks: 50
Note: All questions are compulsory. All carry equal marks.
Q:2. Differentiate the Following ?
Image Scanner & Data Scanner
Drum Printers & Pen Plotter
LCD & LED Monitors
Large Venue Projectors & Home Cinema Projectors
Image Scanner & Data Scanner
An image scanner is a digital device used to scan images, pictures, printed text and objects and then convert them to digital images. Image scanners are used in a variety of domestic and industrial applications like design, reverse engineering, orthotics, gaming and testing. The most widely used type of scanner in offices or homes is a flatbed scanner, also known as a Xerox machine. This modern image scanner is a descendant of early fax input devices and telegraphy equipment. Various types of scanners:
Drum Scanners:
These scan an image with photomultiplier tubes (PMT). The reflective originals are accumulated with an acrylic cylinder or drum, which rotates when the object is passed for scanning in front of the precision optics. These optics then transmit the image information to the PMT. For color, a drum scanner uses three PMTs for reading red, blue and green.
Flatbed Scanners:
These consist of a glass pane and a moving optical array of charge-coupled device (CCD) scanning. Flatbeds contain three arrays of sensors along with red, green and blue filters. Images to be scanned are placed flat on the pane and a dense cover is used to keep out ambient lights. Then the sensor arrays and light source move across to read the full image area. For transparent images, special accessories for illuminating them from the upper side are used.
Film Scanners:
Slide or negative film strips are placed in a carrier inside the film scanner. This carrier is moved with the help of a motor along a lens and a CCD sensor.
Scanner data
Scanner data are the data recorded by the retailors when consumers make purchases. They include, for each article sold in a store on a given day, the quantity of articles sold and the sales price. They are transmitted daily by the retail chains to in see. These data are used in the compilation of the Consumer Price Index or in research on this indicator.
Drum Printers & Pen Plotter
Drum Plotters
The drum plotter is a specialized output device whose name indicates its function. This device works by moving a pen on a single axis track while the paper moves on a cylindrical drum. Typically, the drum moves the paper to the right and left, while the pen or pens draw up and down. If you use more than one pen, then you can have different colors.
That drum adds another axis during printing, allowing you to create graphs up to the size of the drum itself. Being able to print graphics of any width and length adds great versatility in printing a wide variety of large documents. Some of the documents created include architectural drawings.
Pen Plotters
Pen plotters are basically just a robot arm with a pen on the end. They differ from printers in that they draw lines, rather than laying down dots. That makes them vector-, rather than raster-based, with all the advantages that brings in terms of resolution and speed.
They’re not a new technology at all — the earliest reference to something similar that I can find is from Italian teacher Andrea Bina, who in 1751 used a pendulum with a pointer attached to the bottom to trace lines in sand during earthquakes. Over time, these kinds of analogue recording devices attached to measuring tools became XY writers, and these eventually became digitally controlled. The plotter was born.
The heyday of plotters was in the 1960s and 70s, when they were used in much the same way that printers are today. In computer-aided design, in particular, they could produce line drawings very quickly at a quality much higher than the printers of the time. As printer technology improved, though, they became defunct for most purposes.
LCD & LED Monitors
Differences between LCD and LED are important to understand as they are both very co-related and it is possible to get confused between one and the other. LCD is the abbreviation for liquid crystal display while LED is the abbreviation for light-emitting diodes. They differ from one another in the fact that LCDs usually use fluorescent lights while lights use light-emitting diodes. The structure of both LCD and LED is quite the same as the technology behind these screens is the same. The differing television types have two different layers of polarized glass and through this glass, the liquid crystals get blocked as well as pass the light. Thus, this is one of the key differences and similarities between LCD and LED.
The table given below lists the differences between LCD and LED. In short, knowing about LCD Vs LED will help to a greater extent.
| IT Difference between LCD and LED | |
| LCD | LED |
| LCD stands for liquid crystal display. | LED stands for light-emitting diodes. |
| All LCDs are not a subset of LED TV. | All LEDs are a subset of LCD TV. |
| LCDs primarily use fluorescent lights. | LEDs use light-emitting diodes. |
| Fluorescent lights used are usually placed behind the screen. | Light-emitting diodes are usually placed behind the screen or around the edges. |
| LCDs are usually thicker and lack energy efficiency compared to LEDs. | LEDs are much thinner and are much more energy-efficient. |
Large Venue Projectors & Home Cinema Projectors
Large Venue projectors are generally over 7000 Lumens, have interchangeable lenses, and more options for the professional installation. They are used in houses of worship, large conference rooms, and auditoriums.
Large venue projectors are very different to those used in offices or meeting rooms. First of all they are considerably larger and significantly brighter (they start at 6000 ansi lumens) than office projectors. They also have features dedicated to producing images on a large scale such as on board edge-blending and stacking capabilities.
Large venue professional projectors also feature horizontal and vertical lens shift as well as a fleet of optional lenses available which allow you to create your desired image regardless of the environment.
Home Cinema Projectors
This is for people who want to spend the time and money to reproduce the dark viewing experience of a commercial movie theater in their home. And if you love the pure, super high quality film and video experience, nothing can beat it. Because home theater projectors are meant to be viewed in the dark, they are designed to give you absolute maximum black levels and contrast. Meanwhile, the picture quality is optimized with not too much brightness since an overly bright picture in a dark room will give you eyestrain and a headache before too long.
No comments:
Post a Comment