How A Barcode Scanner Works

Common flat-plate barcode scanners are generally composed of a light source, an optical lens, a scanning module, an analog-to-digital conversion circuit, and a plastic case.

It uses a photoelectric element to convert the detected light signal into an electrical signal, and then the electrical signal is converted into a digital signal by an analog-to-digital converter and transmitted to a computer for processing. When scanning an image, after the light source shines on the image, the reflected light passes through the lens and converges on the scanning module. The scanning module converts the light signal into an analog digital signal (that is, the voltage, which is the intensity of the received light (Relevant), and point out how dim the image is. At this time, the analog-digital conversion circuit converts the analog voltage into a digital signal and sends it to the computer. The colors are quantized with 8, 10, and 12 bits of RGB three colors, and the signals are processed into the image output of the above-mentioned number of bits. If there are higher quantization digits, it means that the image can have richer levels and depths, but the color range has exceeded the recognition ability of the human eye, so within the resolvable range, for us, higher-digit barcode scanning The effect of the scanner scanning is smooth color connection, and you can see more details of the picture.