Why use LED light source for lighting source line array CCD image sensor measuring circuit, pulse frequency to drive by linear CCD line integer times?
Because CCD is only a row of pixels, an image output is a row of pixels, if the ambient light suddenly changes in the output of a row of pixels within the time, will lead to a row of pixels, the individual pixels high, individual pixels is low, affect the actual test results.
The light source to ensure that at least one line in the pixel readout time is stable, so the driving frequency must be an integer multiple of CCD readout frequency or frequency.
