2. The code scanner in the supermarket is actually a converter that converts bar codes into numbers. This kind of equipment is basically divided into two types, scanning gun and scanning platform. Their function is very simple, and bar code graphics are converted into digital signals through infrared detection. So as to be called by cash register equipment or background management equipment.
3. The cashier connected to the 3.POS machine is a code scanner and has no storage function. After scanning, it transmits the data to the computer for storage. Inventory is called an inventory machine or data collector. It is a computer, and its principle is the same as that of a mobile phone. It has a CPU, memory, flash memory and memory card. What does it have to do with the program? Just like a computer opening a webpage or a program, data can be uploaded directly to the server or temporarily stored in a computer collector.
4. It uses photoelectric elements to convert the detected optical signals into electrical signals, and then converts the electrical signals into digital signals through an analog-to-digital converter, and transmits them to a computer for processing.
5. When scanning an image, the reflected light from the light source shines on the image and is converged on the scanning module through the lens. The scanning module converts the optical signal into an analog digital signal and points out the gray level of the image.
6. At this time, the analog-to-digital conversion circuit converts the analog voltage into a digital signal and transmits it to the computer. The color is quantized with 8, 10 and 12 bits of RGB, which not only processes the signal into the above digital image and outputs it. If there are higher quantization digits, it means that the image can have richer levels and depths, but the color range is beyond the recognition ability of human eyes. Therefore, for us, the effect of higher-digit bar code scanner scanning is that the color connection is smooth, and more picture details can be seen.
Extended data
(1) The light transmission mirror of the scanning window is made of special toughened material, which is more resistant to breakage, smoother in light transmission and farther in depth of field;
⑵ The gun body plastic conforms to the national standard manufacturing process, and has no peculiar smell, high temperature resistance, corrosion resistance and easy scrubbing. The gun wire can be removed with a pin, which is very convenient to operate;
⑶ The ergonomic design is perfectly embodied, the buzzer is louder (but smaller), the shock absorption is reasonably configured from beginning to end, and it can withstand repeated ground tests against a 2-meter drop.
References:
Baidu Encyclopedia: Bar Code Scanner