Now, with the user-level increase, no longer satisfied with simple computer host, for a variety of growing demand for computer peripherals, including printers, scanners, pen and so on. One scanner as certain technical content of products, market developments, technology advances.
Scanner in the daily work of learning and what use is it? Ask a simple question: is the media rich, we often see good to see posters, posters, graphic material, very good, want to buy it, but first of all, if it is borrowed, how do? “Black” out? NO! Is also non-gentleman, then use a scanner to scan into the computer saved, you can access at any time, do not fade! There is a need to save the file to a computer, but not type or someone gay is too slow, I do? With special recognition latitude d600 battery scanner (OCR) software, easy to get! In others, “Ji Zhuomi” the fine chemicals could have COFFEE. See a landscape photo, the U.S. Oh well good! ! ! Want to take to do the desktop background, simply get a scanner, you can enjoy every day.
In short, the scanner can be printed pieces, written text, photos and other media information into the computer, and can be treated arbitrarily by the software to suit different applications. From a technical standpoint, the scanner is to traditional analog video into one digital imaging devices. It is the original manuscript of the analog optical signal into a set of pixel information, and ultimately to digitally stored in digital files, digital images to achieve.
First, the classification of the scanner
(A) of the Interface
Present a common scanner interface mode (that is, between the scanner and computer connections) are SCSI, EPP, USB three types:
1, latitude d830 battery SCSI interface. SCSI interface scanners require a SCSI card connected to the computer scanner (SCSI card is usually required in the built-in scanner), scanner, mostly early SCSI interface. Advantage of faster transmission speed, high quality scanning; disadvantage is the need to open the chassis to install a SCSI card, to take an ISA or PCI slot and the corresponding interrupt, installation is relatively complicated, it may conflict with other accessories.
2, EPP interface. We often say that printer port (parallel port). And the SCSI scanner is slow compared to scanning quality bit weak, easy installation, good compatibility, most of the EPP interface with back of the scanner has two interfaces, one connected computer, and another parallel port device connected to other (usually the printer).
3, USB interface. Is the latest form of the interface appears, the general comes with USB interface, ATX motherboards, is generally not the old AT motherboard with (some of the newer AT motherboard has USB connection ports, but to buy an additional cable.) Advantage is faster than EPP fast, hot plug, plug and play, the newer USB scanner can take power directly from the USB port, without additional power supply. Disadvantage is that the machine does not take the older models, selling price is also a little bit more expensive than the EPP.
As can be seen from the above three points, industry and professional users or to the effect of demanding users may try to use SCSI and USB scanners, general office use can select EPP.
(B) the works.
Since ancient times, there are hand-held, tablet, film special, roller and CIS scanner.
1, hand-held. Now almost did not see for a long time ago before anyone used the cheaper, optical resolution is generally 100DPI – 600DPI between the mostly black and white.
2, flat. Also known as CCD scanners, the main sweep Fan Shegao. 300DPI-2400DPI optical resolution of all, the median is up to 48 colors.
3, film scanners. Mainly used to scan slides, photo negatives, CT film and professional film, high accuracy, strong sense level, the software comes with more professional.
4, roller. battery for Dell inspiron 2500 Scanner with a point source of a pixel to be sampled, the use of RGB color separation technology, the advantages of course obvious that the true professional, the price is also a professional level.
5, CIS scanner. 98 years after the advent of the new scanner, CIS means “contact image sensor”, without optical imaging system, simple structure, low cost, lightweight and practical, but the scan is issued on the thickness and smoothness of demanding imaging worse results than the CCD.
Of course, there are CCD scanner with TMA (Tousao devices), can scan film.
Second, the technical indicators of the scanner
In contact with the scanner when we will see a variety of technical indicators, the following brief overview of common indicators.
1, scanning accuracy. We often say that the resolution of a scanner to measure the important parameters of the grade level, it reflects a scanner scanning can be achieved in the fine level. Scanning accuracy is usually DPI (resolution) that the technical indicators, and similar inkjet printers, DPI value is larger, the image scanner finer. Optical scanning resolution into the resolution (true resolution) and interpolated resolution (maximum resolution) into two categories, the former is a hardware form, which is the software form.
2 replacement inspiron 9400 battery color digits. Median colors that identify the colors in the scanner’s capabilities and be able to describe the color range, which determines the color of the true extent of reduction, the greater the number of bits color scanning, the better, more realistic, the distortion on the scanning process less.
3, the gray scale. Gray-scale scanner scans reflect the level of available range from dark to light levels of ability, specifically, from black to white scanner smooth transition between the ability. The greater the median gray level, relatively speaking, the more extensive the level of the scan results, the better.
4, scan format. Refers to the range of the scanner can scan, which is the size of the paper, generally A4, A4, A3 and so on.
5, compatibility. Almost all scanners can be used for PC, a lot of SCSI and USB compatible scanners marked MAC (Apple).
6, the system environment. Scanner work requires drivers, these drivers can be used in which the system, such as WIN98, WIN2000, WINNT, etc., there are some other SCSI and USB scanners also FOR MAC (Apple) OS drive.
7, optional accessories. Usually refers to the document feeder (ADF) and Tousao adapter (TMA), not all scanners support the external accessories, also mentioned earlier, some scanners do go in the TMA.
Third, the scanning software
1, image class. Scanning the object used as image processing, such as PHOTOSHOP, I shaped my prime, scan master, and the image that comes with WINDOWS programs.
2, OCR class. Scan objects used for word processing, image files into text files, such as Thunis OCR, Book OCR, Penpower OCR, OCR text links and so on, there is recognition by an English TEXTBRIDGE.
3, vectorization software. Drawings by professional scan usually takes the scanner with the project (A0 or super-large format A0) scanners are not nearly all of the band, be a single buy, a common Thunis.
Fourth, scanning principle
Scanners currently on the market used to see are two completely different manufacturing principles. One is the Dell inspiron mini 10 battery CCD technology, the sensor on the imaging lens; the other is CIS contact scanning. CIS technology used in fax machines past, mainly manufacturing. Its LED lamp with a sweep of images after the sensor is directly recorded by CID, without the use of refractive lenses, so the whole body can do very thin. It is more suitable for use in graphic files or general planar scanning, not suitable for scanning three-dimensional objects or transmission is issued (Note: The draft is the transmission of light through to the articles, such as negatives, slides, etc.).
