Scanner technology develops new trend
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At present, the average ratio of global scanners to PCs is as high as 20%. The popularity of scanners in China is also growing at a geometric rate.
In the face of different brands of different types of nearly 100 kinds of scanners in the market, should be based on their actual needs to set out to understand the trend of technology, can not blindly pursue the cheap, remember that "a penny, a point of goods," the reason is particularly important.
Scanners Scanners currently on the market can be classified into CCD (photocoupled sensor) scanners and CIS (contact image scanner) scanners. The former focuses on a CCD through a lens and converts optical signals into electrical signals. Keep a close contact with the surface of the scanned document. Comparing the two scanning methods, it can be seen that the contact depth scanning device CIS has a smaller depth of field, and the scanning effect is poorer for the originals and uneven originals; the CCD scanner focuses directly on the CCD through the lens, so its depth of field is more than that of the CIS. With a large number of instruments, physical scanning is very convenient. Although many people think that CIS scanners can be made very compact, CCD scanners generally appear to be heavy, but the recent use of ultra-thin CCD products on the market has changed this situation, making the original CIS scanner only advantage Nothing exists. Almost all leading scanner manufacturers have stopped the production of CIS scanners.
Optical resolution Optical resolution is a key factor that directly affects the sharpness of the scanned image, and it is also an important indicator to determine the quality of the scanner. The strict definition of the unit of resolution of the scanner should be ppi, but it is also commonly referred to as dpi. Ppi refers to the number of pixels per inch. For a scanner, each pixel is not a simple relationship such as 0 or 1, but is a description of 36 bits, 42 bits, or CMYK (1004).
The dpi of the printer's resolution d refers to the dot in English. Each dot has no distinction between depth and depth. It is only a concept of 0 or 1. For a scanner, 1 pixel requires 4 dots (CMYK). To describe, the color of a point is determined by the degree of density of different dots. So the dpi of the scanner is different from the dpi concept of the printer. For example, use a 1440dpi printer to output a 1:1 image and scan it with a scan of about 100-150dpi. Optical resolution is horizontal and vertical. Horizontal resolution is usually used to determine the accuracy of the scanner, because the vertical resolution can be controlled by the scanner's stepper motor, and the lateral resolution is completely determined by the scanner's CCD accuracy. When purchasing a scanner, users often see that in addition to the optical resolution, there is a technical indicator called “highest resolutionâ€, which is a result obtained by software interpolation and should not generally be considered important. reference indicator.
The number of color bit colors is an important technical indicator that the scanner can capture the color gradation information. A high color bit can obtain a higher dynamic range, and the color performance is also more vivid and realistic. It may be that the 36-bit scanner has just entered the home market at this time of last year, but today the 42-bit scanner has become the mainstream in the home market. In contrast, home users' demand for the number of color bits of the scanner is far higher than the requirement for scanning accuracy. Due to limitations of some output means such as home printers, too high scanning accuracy (eg, over 600 dpi), for Home users are an intangible waste. However, the number of color bits reflects the scanner's ability to restore true colors, and any user's pursuit of color authenticity is endless. Although the number of home scanners on the market is currently 42 bits (36 bits will continue to exist), 48 bits are still available. The scanner is gradually moving towards the main popular column. For example, the new Scanmaker3800 released by Microtek can capture 281 megabytes of color with more color information.
Interface Type The interface type has completely entered the USB era. At present, scanner interface standards on the market mainly include EPP, SCSI, USB, and IEEE1394. The SCSI interface has a fast transmission speed, but it requires an additional SCSI with a rising value in the computer. The connection card not only increases the cost of the scanner, but also involves complicated installation. Currently, it is limited to professional users. As an emerging industry standard in recent years, the USB interface has performed well in terms of transmission speed, ease of use, and computer compatibility. Since its launch in 1999, the share of the home market has steadily increased and has become a recognized standard. Although the EPP interface scanner can still be seen on the market, almost all manufacturers have stopped production. In particular, the slower data transmission efficiency has greatly limited the speed of the scanner, and obviously cannot be adapted to the fast-paced era. need.
Shortcut keys have become a trend of development. For home scanners, there are a series of auxiliary technical indicators in addition to resolution, color bits, and interface types to enhance the ease of use and other functions of the scanner. Such as the Microtek series scanners equipped with automatic pre-scan function, "GO" key design, energy-saving design, etc. Although these designs are not important to the above hardware indicators, but it is with the aid of these functions, the use of scanners can be more handy.
At the same time, the shortcut function keys have also become a new configuration that has gradually emerged. From the original one-button scanner Scan to a three-button scanner Scan, Copy and E-Mail, OCR and Scan to Web have been added. The function expands to five function keys. Due to the appearance of shortcut function keys, the steps for the user to use the scanner are simplified, and the needs of users who are pursuing ease of use are greatly satisfied. The direction of future scanners will also be more simple and convenient.
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