Characteristics And Principles Of Bar Code Scanner

Characteristics And Principles Of Bar Code Scanner

A good Barcode Scanner has the following characteristics
⑴ The scanning window light penetration mirror adopts special toughened material, more fragile, light transmittance is more smooth, making the depth of field farther; The gun body plastic in line with the national standard production process, do no odor, high temperature resistance, corrosion resistance, easy to scrub, gun line with a pin is desirable, the operation is very convenient;
(3) The ergonomic design is perfect, the beep sound is larger (can be small), the shock absorption is reasonably equipped from beginning to end, can resist multiple 2 meters fall road ground test.

Common flat bar code scanners are generally composed of light source, optical lens, scanning module, analog digital conversion circuit and plastic shell. It uses the photoelectric element to convert the detected optical signal into electrical signal, and then converts the electrical signal into digital signal through the analog digital converter and transmits it to the computer for processing. When AN IMAGE IS SCANNED, A LIGHT SOURCE HITS THE IMAGE AND THE reflected light passes through the lens and is concentrated ON the scanning module, which converts THE optical signal into an analog digital signal and indicates how dark the image number is. This is when an analog-to-digital conversion circuit converts the analog voltage into a digital signal that is sent to a computer. Color with RGB three color 8, 10, 12 bits to quantify, both signal processing into the above number of image output. If there is a higher quantization digit, means that the image can be more rich administrative levels and deepness, but color range has been beyond the recognition of the human eye, so within the scope of the distinguished for us, good higher digits of the barcode scanner to scan is smooth color cohesion, and be able to see more image details, very reliable.

The resolution of a good barcode scanner is determined from three aspects: the optical part, the hardware part and the software part. In other words, the resolution of the barcode scanner is equal to the resolution of its optical components plus the resolution of its own hardware and software processing.
Optical resolution is the barcode scanner optical components in every square inch area can capture the actual number of spot, is refers to the barcode scanner CCD (or other photoelectric devices) physical resolution, is also a real resolution of barcode scanner, it is made up of pixels of optoelectronic devices can capture divided by barcode scanner sweep horizontal maximum size. For example, the resolution of the bar code scanner is 1200DPI, often the resolution of its optical part only accounts for 400 ~ 600DPI. The resolution of the extension is generated by a combination of hardware and software, which is generated by computer analysis of the image and mathematical filling of the blanks.
Optical scanning is reliable, one-to-one with the output, and what is scanned, the output is what. After computer software and hardware processing, the output image will become more realistic, the resolution will be higher. At present, most of the bar code scanners sold on the market have software and hardware expansion functions to the resolution.