Barcode scanner internal structure and working principle
Barcode scanner internal structure and working principle:
The common flat bar code scanner is generally composed of a light source, an optical lens, a scanning module, an analog-to-digital conversion circuit and a plastic housing. It uses the photoelectric element to detect
The optical signal is converted into an electrical signal, which is then converted into a digital signal by an analog-to-digital converter and transmitted to a computer for processing. Convert to electrical signals and then pass electrical signals through analog digital
The converter converts the digital signal into a computer for processing.
When scanning an image, the light source illuminates the image and the reflected light converges on the scanning module through the lens. The scanning module converts the light signal into an analog digital signal.
(ie voltage, which is related to the intensity of the received light), while indicating the degree of darkness of that pixel. At this time, the analog-to-digital conversion circuit converts the analog voltage into a digital signal.
Send it to the computer.
The color is quantized with RGB three-color 8, 10, and 12 bits, and the signal is processed into the above-mentioned bit number of image output. If there is a higher number of digits of quantization, it means that the image can have more
The level and depth of the rich, but the color range has exceeded the recognition ability of the human eye, so for us, the effect of scanning out the higher-bit bar code scanner
It is smooth in color and can see more details of the picture.