The principle of the bar code scanner
Platetype bar code scanner generally consists of light source, optical lens, scanning module, analog digital conversion circuit and a
plastic casing.It use photoelectric element detect the light signal into electrical signal,and then the electrical signal is converted into
digital signal via an analogto- digital converter transmission to the computer processing.When scanning an image , illuminate to
image reflected light through the lens converge to the scanning module, the scanning module converts the optical signal into an
analog digital signal (i.e.,the voltage, it related to accept to the intensity of light),and while point out the Pixel’s gray degree.This
time analog - digital converter circuit analog voltage into a digital signal , transmitted to the computer. Color RGB color 8, 10, 12
bits quantization ,that the signal processing into the digit image output.If the quantization bits higher, means the image has 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,the higher bits of the bar code scanner to scan out effect is color convergence smooth, to be able to see
more detail.
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