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Basic knowledge of scanning guns

Release time:2016-10-27 15:55:01

We usually encounter in the contact scanning guns, often encountered many difficult professional and technical terms: such as optical resolution (optical resolution), maximum resolution (maximum resolution), color resolution (color depth), scan mode, interface Way (connection interface) and so on. I would like to introduce the basic knowledge of these scanning guns, the majority of readers to popularize the knowledge of scanning guns. So that we can better understand the scanning gun, when we buy scanning guns can also be used as a reference.
 
First of all we need to know what is called resolution. All kinds of scanning guns are marked with its optical resolution and maximum resolution. The unit of resolution is dpi, which is the abbreviation of Dot Per Inch, which means the number of pixels per inch. Understanding the meaning of resolution, let us take a look at the following parameters of these scanning gun how important to us.
 
Optical resolution refers to the actual amount of information that can be acquired by the optical system of the scanner, that is, the resolution of the sensing element of the scanning gun. For example, the maximum scanning range of 216mm × 297mm (for A4 paper) scanning the maximum width of the scanner is 8.5 inches (216mm), it's photosensitive original contains 5100 units, the optical resolution of 5100 ÷ 8.5 inches = 600dpi . Common optical resolution is 300 × 600dpi, 600 × 1200dpi, 1200 × 2400dpi or higher.
 
Color resolution, also known as color depth, color mode, color bits or levels, in short, that scan gun to distinguish color or gray level of fine indicators, it is the unit (bit). The exact meaning of the color bits is how many "bits" are used to represent the scanned pixel. For example: 1bit can only represent black and white pixels, because the computer using the binary number, 1bit can only represent two values ​​(2 1 = 2) that 0 and 1, they represent black and white; 8bit can represent 256 gray levels (2 24 = 16777216), generally known as more than 24bit color is true color, of course, with 30bit, 36bit, 16bit, 16bit color, 42bit models. In theory, the more bits of color, the more realistic color.
 
Let's talk about the relationship between resolution and file size. General scanning applications can automatically calculate the file size when you preview the original document, but knowing how to calculate the size of the file will help you make the appropriate selections when managing scanned documents and determining the scanning resolution. Black and white image file is calculated as follows: horizontal size × vertical size × (scanning resolution) 2 ÷ 8. The color image file is calculated as follows: horizontal size × vertical size × (scanning resolution) 2 × color depth × 1/8. For example, with 24-bit color RGB scanning a common color photos (3.5 × 5 inches), the scanning resolution of 300dpi, then the image file length is 5 × 3.5 × 300 2 × 24 × 1/8 = 4725000Byte that is 4.7MB .
 
The last concept to be addressed is OCR. It is the abbreviation of English Optical character recognition. Its function is to scan the gun and other optical input devices to read text on the print image information, the use of pattern recognition algorithm, the analysis of the morphological characteristics of the text in order to determine the different Chinese characters. Chinese OCR is generally only suitable for the identification of printed Chinese characters. OCR can be used in addition to scanning guns can be partially replaced by the keyboard input Chinese characters, is the effort of the text input method. OCR common Tsinghua Tong Wen, Shang, Meng Tian, ​​and so on.

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