The illumination is very critical factor in machine vision system with optical lens, also image information changes depending on the illumination condition and applications.
Finally, it will be not only effect the measurement value of improper illumination selection but irritated uncorrected data thus we have to choose proper intensity of illumination according to the F/#, sensitivity of camera, setting value (gain, shutter speed).
Therefore, it has been applied of various applications due to wide range of divergence, various color, compact shape and it is possible to corrected measure regarding of certain wavelength.
LED lights are more stable and have a longer life than other lights, provide the best performance with fast and accurate response speeds, and can be measured accurately depending on the characteristics of objects responding to specific wavelengths with light colors according to various wavelengths.