What is a barcode scanner ? How does it work?

The barcode scanning gun is the 3rd generation of key computer input device after the computer keyboard and computer mouse, and is a high-tech product that is closely integrated with optical, electronic, mechanical, and software application technologies. Since the scan gun was introduced in the 1980s, then the scan gun has been rapidly developed and widely used in various places, including the most direct photos, pictures, films, to all kinds of drawings and manuscripts, which can use the barcode scan gun to input image information into the computer, and then realize the processing, use, storage, management and output of these image information.

    The components of the more common flatbed barcode scanning guns are usually the light source, optical lens, scanning module, analog-to-digital conversion circuit plus the outermost plastic shell. The working principle of the barcode scanner gun: The barcode scanner gun converts the detected light signal into electric signal by using photoelectric components, and then uses the analog-to-digital converter to convert the electric signal into digital signal for transmission to the computer for processing.

    When the barcode scanning gun is to scan the image, the light source irradiates to the image reflected light through the optical lens gathered on the scanning module, and the scanning module converts the light signal into analog-digital signal (that is, voltage, which is related to the intensity of the light received), and at the same time points out the degree of darkness of that image number. At this point, the analog-to-digital conversion circuit converts the analog voltage into a digital signal, which is then transmitted to the computer. The color is quantized by 8, 10 and 12 bits of RGB, i.e. the signal is processed into an image output with the above mentioned bits.

    If there is a higher quantization bit, the image can have a richer level and depth, but the color range at this time is beyond the human eye's ability to recognize, the human eye can not recognize, so based on the human eye can distinguish the range, the higher bit number of barcode scanning gun for us is to be able to scan the color articulation smoother effect, but also can see more details of the picture.