Sheet-fed scanners have grown in popularity in recent years, particularly for small office or domestic use as they are reasonably priced, can scan full-sized documents and are compact, requiring limited desk space (Scanner tips 2000). Most models of sheet-fed scanners have an inbuilt document feeder to overcome the problem of manually feeding one sheet of paper at a time. However the actual process or scanning with a sheet-fed scanner may result in distortion as the image to be scanned moves over the scanning heads (Scanner tips 2000). A further limitation of sheet-fed scanners is that they are unable to scan three dimensional objects. Hand held scanners are compact free college essay topics, portable scanners which are simply dragged across a page manually to capture an image. These scanners are easy to use and economical to purchase; however free thesis paper download, their use is limited to text of up to four inches in diameter that does not require a high resolution. For this reason, hand held scanners are unsuitable for colour images. A further disadvantage of hand held scanners is that the user must have a steady hand when scanning or the resulting image will be distorted (Scanner tips 2000). A scanner, like any type of hardware, requires software. Typically the two most common pieces of software provided with scanners include optical character recognition (OCR) and image editing software. Optical character recognition software translates the information recorded in a scan, tiny dots, into a text file which can be edited. Image editing software allows the tones and colours of an image to be manipulated for better printing and display. Image editing also gives filters to apply special effects to scanned images It would be better to use a more recent reference here. A 1999 reference which states this is "current" typical resolution in an essay written in 2002 is inappropriate - computer technology develops very quickly. Interpolated resolution measures the number of pixels a scanner is able to predict. A scanner can turn a 300 x 300 dpi scan into a 600 x 600 dpi scan by looking in-between scanned pixels and guessing what that spot would have looked like if it had been scanned. This prediction is then used to insert new pixels in between the actual ones scanned. This technique is less precise than optical resolution; however it assists in improving the enlargement of scanned images. The concept of 'dynamic range' has not been sufficiently explained here. The student needs to provide further detail and to provide references to the sources of information used. Date: Anderson, D. The PC Guide. [http:www.pctechguide.com/18scanners.htm]. This report investigates the current state of scanner technology and examines the predicted future advancements of scanners. A brief history of the scanner and its operation is initially outlined. The discussion then focuses on the advantages and limitations of the five main types of scanners in common use today: drum, flatbed, sheet-fed, slide, and hand held scanners. The performance of these scanners is examined in relation to four main criteria: resolution, bit-depth, dynamic range and software. It is concluded that further technological advances in these four areas as well as the deployment of new sensor technology will continue to improve the quality of scanned images. It is also suggested that specialised scanners will increasingly be incorporated into other types of technology such as digital cameras. This paragraph provides an appropriate amount of detail. Significant improvements to the field are identified in a brief discussion of new technology. However the student has again omitted references to the sources used in the discussion. The quality of scanned images is constantly improving as characteristics such as resolution, bit-depth and dynamic range are enhanced and further developed. More sophisticated image editing and optical character recognition software development is also resulting in superior quality scans. Future advances are expected to result in the incorporation of specialized scanners into other types of technology such as the recently developed digital camera. This device allows the user to take pictures of three-dimensional objects much like a regular camera the death penalty essays, except that instead of using film essay about my teaching profession, the objects are scanned by the camera in a similar process to the functioning of a flatbed scanner. By examining a range of recently published journal articles, magazine articles and internet sites on the topic of scanners this report describes the main types of scanners in common use today and examines their performance in relation to four criteria: resolution smoking should be banned essay, bit-depth, dynamic range and software. The report then considers the effect of further technological advances in these four areas, as well as the deployment of new sensor technology on the future development of scanners. The purpose of this report is to survey the current state of scanner technology and to briefly discuss predicted advancements in the field. WARNING - do not use this reference list as a model! Figeiredo, J. McIllree, J. Thomas, N. (1996) Introducing information technology 2nd edition Jacaranda Press opening cover letter paragraphs examples, Singapore, p145. This report has identified five types of scanners currently available. Some are primarily used for professional purposes such as the drum scanner; others are used more broadly in the workplace and home such as flatbed scanners and to a lesser extent sheetfed scanners. Scanners for specialized purposes have also been identified such as slide and handheld scanners. The performance of these scanners is dependent upon their resolution, bit-depth, dynamic range and software. Scanners have improved significantly in recent years in terms of weight, size help writing thesis statement, price and speed, and the replacement of CCD technology with CIS technology is anticipated to produce further benefits to these areas as well as to scan quality. The impact of these improvements is expected to increase the accessibility of scanner technology to a wider range of users and its suitability for a wider range of purposes. In relation to this, the future of scanner technology seems to point to the convergence of different technologies. Specialized scanners are currently being incorporated into other types of technologies such as digital cameras, printers, and photocopiers. This can be expected to continue with other forms of technology in conjunction with further improvements to image quality essay types of, speed what is in a cover letter sample, price, size and weight. An early improvement on the reading machine was the drum scanner. These scanners used a type of scanning technology called photomultiplier tubes (PMT). Drum scanners are still used in industry today because of the high quality images they produce. The development of smaller, more economical scanners such as desktop scanners and scanners for domestic use followed the drum scanner as the number of computer users increased and computer technology advanced.
Depending on the type of report, the structure can include: • the results or findings of the investigation All reports have a similar structure essay about drugs effects, but some details may differ. How they differ usually depends on: An annotated bibliography is a list of resources, including books, articles and documents. Each entry is followed by a concise summary and evaluation of the resource examples of essays in high school, i.e. the annotation. Your assignments will often be in the form of an essay or a report, but there are a number of other assignment types that you may have to do during your studies.
Below is an overview of the different assignment types you may encounter. • Terms of reference. So before you start an assignment make sure you check what is needed in: Note: All of the online sources linked to on this page are for general guidance only. Different education institutions and disciplines have different requirements. Also, different subjects or lecturers/tutors may have different conventions and expectations for written work. • Analysis of the information. A case study is an in-depth investigation conducted over a given length of time. They are used to collect and present detailed information about a person, group or situation, to try to understand what has happened and why, or to analyse the situation to solve a problem. A case study has a number of different phases: Click on the headings below to find out more about each of these assignment types:
0 Comments
Leave a Reply. |
ArchivesCategories |