What is a scanner?
A scanner is an input device of a computer. Its function is to scan the appearance of pictures, photographs, films, manuscripts and other written materials or objects, and then input them into the computer and save them as files. In fact, the scanner has become the third most important computer input device after the keyboard and mouse.
There are various forms of scanners, including black and white scanners and color scanners according to colors; For example, according to the scanning mode, there are hand-held scanners, flat-panel scanners, roller scanners and so on. Flat scanner has the characteristics of wide use, strong function and moderate price, and has been widely used in many fields such as graphic image processing, electronic publishing, advertising production, office automation and so on.
As a new important input device, scanner is widely used. Its function is just the opposite to that of a printer, that is, to input the graphic symbols on contracts, films, etc. into the computer.
Top ten scanner brands
1, Canon Canon (1937, Japan, the world's leading comprehensive group producing imaging and information products)
2. Zhongjing Zhongjing (domestic scanner flag inkstone brand, domestic famous image product export enterprise, Zhongjing Technology Co., Ltd.)
3. Ziguang (1988 Beijing, China Top 100 Electronic Information Enterprise, National High-tech Enterprise, Ziguang Shares)
4. BenQ, BenQ (Taiwan Province Province 1984, a large specialized group company in the field of photoelectric digital media and network communication).
5. Hewlett-Packard (1939 USA, Fortune 500, 1939 Hewlett-Packard Co., Ltd., California, China)
6. Founder (1986, Beijing, China well-known trademark, China famous IT enterprise, Peking University Founder Group).
7. Epson Epson (Nagano, Japan, famous brand, global leading enterprise in digital imaging field 1942).
8. Hanwang Hardware (Beijing in 1998, key high-tech enterprise of National Torch Plan, Hanwang Technology)
9. Hong Guang Avision (199 1 year in Hsinchu, Taiwan Province, the world leader in the production of image input equipment, Shanghai Cai Hong Technology Co., Ltd.)
10 and Fujitsu
Zhongjing is the largest scanner in the world, with a long product line and relatively guaranteed quality, which can be given priority. HP and Ziguang are not bad either. At present, the resolution of mainstream scanners on the market has reached 2400Dpi, and the household models in famous brand products are around 300 yuan. Pay attention when buying, it is best to buy a scanning head made of CCD instead of CIS. CIS products can be made thin and light, but other aspects are not satisfactory, such as low resolution, failure of one tube in LED array and failure of the original with uneven scanning surface. 1500 yuan buys a business-class scanner. However, if it is only used in general, the use effect is no different from that of household level. Do it yourself
How to choose a high-speed scanner
1, scan format
The maximum scanning format of a high-speed scanner is generally divided into A3 and A4 (backward compatible, and the minimum format can scan paper the size of a business card). A3 format high-speed scanner is much more expensive than A4 format high-speed scanner. So the demand is based on theoretical application, begging to stop choosing. Assuming that the documents to be scanned are basically A4, you can choose A4 format. Assuming that there are many A3 format documents to be scanned, you only need to select the A3 format machine.
2. Scanning speed
Generally, the scanning speed of a high-speed scanner ranges from more than 20 pages per minute to more than 65,438+000 pages, but from the price point of view, the price of the machine increases a lot with the increase of the scanning speed of 65,438+00 pages. Therefore, it is necessary to stop the selection according to the actual application requirements, and stop the approximate calculation according to the scanning amount required by each machine every day.
3. Image output
The image output of general high-speed scanners can be divided into two categories: color (including color, grayscale, black and white) and black and white (including grayscale, black and white). When other parameters are not the same at all, color is more expensive than black-and-white machine, so the selection should be stopped according to the actual application. If the document to be scanned only needs to stop saving black and white images, you can choose a black and white scanner. If you must stick to the original color of the document (such as red-headed documents and fresh chapters), just choose the color. In order to reduce the storage pressure and transmit reading in the network faster, even if you buy a color high-speed scanner, you need to see whether the scanner can automatically identify color black and white (output color images when scanning to color pages and output black and white images when scanning to black and white pages, so that you can not only adhere to the original appearance of the file, but also reduce the storage space as much as possible.
In addition, it depends on whether the high-speed scanner can output MultiStream TM dual data streams (black and white &; Color, black and white &; Gray scale), which is very useful in the application of document full-text retrieval. Scanning simultaneously outputs a black-and-white image and a color or grayscale image. Black and white images are used for identification, and color or gray images are used for archiving.
4. Image Enhancement When purchasing a high-speed scanner, it depends on whether the high-speed scanner can meet the requirements in image enhancement, such as automatic cutting, correction, black edge removal, multi-color filtering, and automatic recognition of color/black and white manuscripts. Special attention should be paid to image quality. The image quality obtained by setting the same parameters on different brands of machines is different. Of course, the picture quality is better. If some brands of high-speed scanners need comparable image quality, they need to add kafax cards. kafax cards are expensive, which undoubtedly increases the capital.
5. Paper thickness range
This parameter shows the paper passing capacity of the machine, and the wide range shows better paper compliance.
In a word, the choice of high-speed scanner depends on the format of actual application requirements, and then choose the machine with appropriate speed (calculated according to the amount of scanning to be completed every day). If a single machine needs to work continuously for more than 8 hours 1 day, it is best to choose a consumer-grade high-speed scanner. The paper feeding structure of the machine and the daily handling capacity and attention of the machine advocated by the manufacturer are more important parameters. You can simply judge the stability, failure rate and durability of the machine. In addition, it will be helpful for you to know the image processing effect, failure rate and service life of various brands and models of scanners from other users. Finally, when purchasing a high-speed scanner, you need to confirm the tracking warranty card and after-sales service guarantee. Because the high-speed scanner is different from other ordinary electronic products, it is a combination of electronics and machinery, and you need after-sales service to ensure that your work will not be affected.